WO2007060716A1 - トレンチゲートパワー半導体装置 - Google Patents
トレンチゲートパワー半導体装置 Download PDFInfo
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- WO2007060716A1 WO2007060716A1 PCT/JP2005/021490 JP2005021490W WO2007060716A1 WO 2007060716 A1 WO2007060716 A1 WO 2007060716A1 JP 2005021490 W JP2005021490 W JP 2005021490W WO 2007060716 A1 WO2007060716 A1 WO 2007060716A1
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- trench gate
- region
- gate power
- semiconductor device
- power semiconductor
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- 239000004065 semiconductor Substances 0.000 title claims description 112
- 210000000746 body region Anatomy 0.000 claims abstract description 57
- 238000000605 extraction Methods 0.000 claims description 121
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- 238000004519 manufacturing process Methods 0.000 description 39
- 238000000034 method Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 13
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- 229910052796 boron Inorganic materials 0.000 description 11
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- 229910052814 silicon oxide Inorganic materials 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 9
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- 238000012986 modification Methods 0.000 description 8
- 238000000137 annealing Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 6
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- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
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- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
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- HAYXDMNJJFVXCI-UHFFFAOYSA-N arsenic(5+) Chemical compound [As+5] HAYXDMNJJFVXCI-UHFFFAOYSA-N 0.000 description 1
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- 238000005468 ion implantation Methods 0.000 description 1
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- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
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- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
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- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
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- H01L29/66712—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/66734—Vertical DMOS transistors, i.e. VDMOS transistors with a step of recessing the gate electrode, e.g. to form a trench gate electrode
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- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
- H01L29/7396—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions
- H01L29/7397—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions and a gate structure lying on a slanted or vertical surface or formed in a groove, e.g. trench gate IGBT
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- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7803—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device
- H01L29/7804—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device the other device being a pn-junction diode
- H01L29/7805—Vertical DMOS transistors, i.e. VDMOS transistors structurally associated with at least one other device the other device being a pn-junction diode in antiparallel, e.g. freewheel diode
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Definitions
- the present invention relates to a trench gate power semiconductor device.
- FIG. 17 is a cross-sectional view of a conventional trench gate power semiconductor device 900.
- the conventional trench gate power semiconductor device 900 includes a p-type semiconductor substrate 910 (not shown) and an n + type epitaxial layer 911 (see FIG. Not shown), an n-type epitaxial layer 912 (first conductivity type semiconductor layer) disposed on the n-type epitaxial layer 911, and a P formed near the top surface of the n-type epitaxial layer 912.
- Type body region 920 second conductivity type body region
- the trench gate power semiconductor device includes a gate 918 formed in a trench 914 with a gate insulating film 916 interposed therebetween.
- An emitter region 922 is formed near the upper surface of the p-type body region 920 in the inter-groove region sandwiched between the groove 914 and the groove 914.
- An insulating layer 928 is formed on the upper portion of the groove 914, and an emitter electrode 932 is formed on the insulating layer 928.
- a force sword electrode 934 (not shown) is formed on the lower surface of the p-type semiconductor substrate 910.
- peripheral region GR further outside outermost groove 914 is connected to and surrounds p-type body region 920.
- the p-type semiconductor region 920a is formed.
- the p-type semiconductor region 920a is formed deeper than the p-type body region 920 in order to maintain a high breakdown voltage.
- the p-type semiconductor region 920a and the p-type body region 920 are connected to the emitter electrode 932 via the contact hole CH on the upper surface of the side diffusion region SD and the upper surface of the margin region MR adjacent to the side diffusion region SD. Yes.
- the emitter region 922 is not formed on the upper surface of the margin region MR.
- the symbol CR indicates a cell region.
- the gate voltage is turned on. Voltage force When the voltage is turned off, a relatively large amount of holes H generated in the vicinity of the side diffusion region SD pass through the side diffusion region SD and are collected by the emitter electrode 932. When the voltage is returned to the OFF voltage, holes are collected quickly, and a high-speed switching operation can be achieved (see, for example, Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 9270512 (FIGS. 1 and 2)
- the present invention has been made to solve the above-described problems, and a trench capable of efficiently recovering holes generated in the cell region and further increasing the switching operation speed.
- An object is to provide a gate power semiconductor device.
- a trench gate power semiconductor device includes a first conductivity type semiconductor layer and a second conductivity type formed in the vicinity of the upper surface of the first conductivity type and opposite to the first conductivity type.
- a carrier extraction region is formed.
- the second conductivity type is formed in a part of the region of the first conductivity type semiconductor layer facing the second conductivity type body region.
- the carrier extraction region is formed in the cell region. It is possible to form a carrier extraction region of the second conductivity type at the site where the collection is desired. Therefore, it is possible to efficiently collect holes generated in the cell region via the carrier extraction region of the second conductivity type, and a trench gate power semiconductor device capable of achieving higher switching speed. Can be provided.
- the second conductivity type carrier extraction region is a part or all of a part of the plurality of grooves. It is preferred to be formed so as to cover.
- the second conductivity type carrier extraction region can be formed so as to cover a part or all of the groove in the region where holes are to be collected. It becomes possible to collect the halls efficiently. Also, in this case, since it becomes possible to form the second conductivity type carrier extraction region only in a part or all of the necessary grooves of the plurality of grooves, the on-resistance is increased more than necessary.
- the second conductivity type carrier extraction region is a part of the outermost groove formed in the plurality of grooves or It is preferred to be formed so as to cover the entire area.
- the second conductivity type carrier extraction region can be formed so as to cover a part or the entire region of the groove in a region where holes are likely to be generated. Can be recovered more efficiently.
- the second conductivity type carrier extraction region is sandwiched between two adjacent grooves of the plurality of grooves. It is preferably formed in a part or all of the part of the inter-groove region in the inter-groove region.
- This configuration also makes it possible to form the second conductivity type carrier extraction region in part or all of the inter-groove region in the region where holes are to be collected. Therefore, it becomes possible to efficiently collect the holes.
- the second conductive type carrier extraction region can be formed only in part or all of the necessary inter-groove region among the plural inter-groove regions. Increase the resistance There is no end to it.
- the second conductivity type carrier extraction region is formed in an outermost groove of the plurality of grooves and the groove. It is preferably formed in a part or all of the inter-groove region sandwiched between adjacent grooves.
- the second conductivity type carrier extraction region is sandwiched between two adjacent grooves of the plurality of grooves and the two. Preferably, it is formed so as to cover the region between the grooves.
- the area of the second conductivity type carrier extraction region can be increased, and holes can be efficiently recovered.
- the second conductivity type carrier extraction region is also formed in a peripheral region further outside the outermost groove of the plurality of grooves.
- the second conductivity type carrier extraction region is also formed in the peripheral region, which is a region where holes are generated in a relatively large amount, so that the holes can be collected more efficiently. It becomes possible.
- the second conductivity type carrier extraction region formed in the peripheral region is a bottom surface of the second conductivity type body region. I prefer to be formed on the side.
- the second conductivity type carrier extraction region is formed on the lower surface of the second conductivity type body region in the peripheral region, which is a region where holes are generated in a relatively large amount. Therefore, the holes can be collected more effectively.
- the second conductivity type carrier extraction region formed in the peripheral region is the second conductivity type. It is preferred to be formed to cover the side of the body area. With this configuration, the second conductivity type carrier extraction region covers the side surface of the second conductivity type body region in the peripheral region, which is a region where holes are generated in a relatively large amount. Since the holes are formed, the holes can be collected more effectively.
- the trench gate power semiconductor device according to any one of (1) to (9) above!
- the second conductive type carrier extraction region is preferably formed to a position deeper than the depth of the groove! /.
- Another trench gate power semiconductor device of the present invention includes a first conductivity type semiconductor layer and a type opposite to the first conductivity type formed near the upper surface of the first conductivity type semiconductor layer.
- a trench gate power semiconductor device including a gate formed on the second conductivity type body region, wherein the first conductivity type is formed in the second conductivity type body region to be shallower than a depth of the second conductivity type body region.
- the second groove is formed in the inter-groove region, and the second conductivity type carrier extraction region is further formed on the lower surface of the second groove. Since it is formed, it is possible to collect holes in the cell region and to form a second conductivity type carrier extraction region in the region. For this reason, holes generated in the cell region can be efficiently recovered through the second conductivity type carrier extraction region, and the trench gate power semiconductor capable of further increasing the switching speed can be achieved.
- a body device can be provided.
- the second groove is an inter-groove region sandwiched between two adjacent grooves among the plurality of grooves. It is preferable that it is formed in all the inter-groove regions. [0031] With this configuration, the second conductivity type carrier extraction region can be formed over the entire surface of the cell region, and holes can be efficiently recovered. In this case, even if the second conductivity type carrier extraction region is formed over the entire cell region, it is possible to prevent the transistor operation from being adversely affected. It wo n’t happen.
- the second groove is an inter-groove region sandwiched between two adjacent grooves among the plurality of grooves. It is preferable that all the grooves are formed in a part of the inter-groove region.
- the second conductivity type carrier extraction region can be formed only in a necessary portion of the cell region, so that the influence on the transistor operation is minimized. It becomes possible.
- the second groove is an inter-groove region sandwiched between two adjacent grooves among the plurality of grooves. Of these, it is preferable to be formed in a part or all of a part of the inter-groove region.
- the second conductive type carrier extraction region can be formed only in a necessary portion of the cell region, so that the influence on the transistor operation is minimized. It becomes possible to make things.
- the second groove is formed in a peripheral region further outside the outermost groove of the plurality of grooves, It is preferable.
- the second groove is further outside the outermost groove of the plurality of grooves. Also preferred to be formed in the surrounding area.
- the second conductivity type carrier extraction region is also formed in the peripheral region, which is a region where holes are generated in a relatively large amount. It becomes possible to collect efficiently.
- the second groove formed in the peripheral region is more than the second groove formed in the inter-groove region. Also wide
- the second conductivity type carrier extraction region formed in the peripheral region is formed in the inter-groove region. Preferably, it is formed to a position deeper than the carrier extraction region of the second conductivity type!
- the carrier extraction region of the second conductivity type is formed to a position deeper than the depth of the groove. I prefer to be ⁇ .
- the trench gate power semiconductor device according to any one of (1) to (20) may be a single MOSFET.
- the trench gate power semiconductor device according to any one of (1) to (20) is an IGB T.
- FIG. 1 is a cross-sectional view shown for explaining a trench gate power MOSFET 1 according to a first embodiment.
- FIG. 2 is a plan view for explaining the trench gate power MOSFET 1 according to the first embodiment.
- FIG. 3 is a diagram showing an impurity concentration profile in the depth direction in the trench gate power MOSFET 1 according to the first embodiment.
- FIG. 4 is a cross-sectional view shown for explaining a trench gate power MOSFET 2 according to a second embodiment.
- FIG. 5 is a cross-sectional view for explaining a trench gate power MOSFET 3 according to a third embodiment.
- FIG. 6 is a cross-sectional view for explaining a trench gate power MOSFET 5 according to a fifth embodiment.
- FIG. 7 is a plan view for explaining the trench gate power MOSFET 5 according to the fifth embodiment.
- FIG. 8 is a diagram showing an impurity concentration profile in the depth direction in the trench gate power MOSFET 5 according to the fifth embodiment.
- FIG. 9 is a plan view for explaining the trench gate power MOSFET 6 according to the sixth embodiment.
- FIG. 10 is a diagram showing manufacturing steps in the method for manufacturing a trench gate power MOSFET according to the seventh embodiment.
- FIG. 11 is a diagram showing manufacturing steps in the method for manufacturing a trench gate power MOSFET according to the seventh embodiment.
- FIG. 12 shows each manufacturing step in the method for manufacturing a trench gate power MOSFET according to the seventh embodiment.
- FIG. 13 is a diagram showing each manufacturing process in a method for manufacturing a trench gate power MOSFET according to a modification of the seventh embodiment.
- FIG. 14 is a diagram showing manufacturing steps in the method for manufacturing a trench gate power MOSFET according to the eighth embodiment.
- FIG. 15 is a diagram showing manufacturing steps in the method for manufacturing a trench gate power MOSFET according to the eighth embodiment.
- FIG. 16 is a diagram showing manufacturing steps in the method for manufacturing a trench gate power MOSFET according to the eighth embodiment.
- FIG. 17 is a cross-sectional view of a conventional trench gate power semiconductor device 900.
- FIG. 1 is a cross-sectional view for explaining the trench gate power MOSFET 1 according to the first embodiment.
- FIG. 2 is a plan view for explaining the trench gate power MOSFET 1 according to the first embodiment.
- the trench gate power MOSFET 1 includes an n ⁇ type epitaxial layer (first conductivity type semiconductor layer) 12 formed on the upper surface of the n + type silicon substrate 10, and p-type body region (second conductivity type body region) 20 formed near the upper surface of n-type epitaxial layer 12 and upper surface side force of p-type body region 20 formed to reach n-type epitaxial layer 12
- the trench gate power MOSFET includes a plurality of trenches 14 and a gate 18 formed in the plurality of trenches 14. Further, p-type carrier extraction regions 26a, 26b, and 26c are formed in a part of the region facing the p-type body region 20 in the n-type epitaxial layer 12.
- reference numeral 22 indicates an n-type source region
- reference numeral 24 indicates a p + type contact region
- reference numerals 28 and 29 indicate insulating layers
- reference numeral 32 indicates a source electrode
- reference numeral 34 indicates a drain. The electrode is shown.
- a trench gate power MOSFET can be provided.
- the p-type carrier extraction region 26a existing in the cell region is a part of some of the plurality of grooves 14 as shown in FIG. Or it is formed to cover the whole area!
- the holes can be collected, and the p-type carrier extraction region 26a can be formed so as to cover a part or the whole region of the groove in the part, so that the holes can be efficiently collected. become. Further, in this case, since the P-type carrier extraction region 26a can be formed only in a part or all of the necessary grooves out of the plurality of grooves 14, the on-resistance is increased more than necessary. There is nothing.
- the p-type carrier extraction region 26a is formed so as to cover the entire region in the outermost groove among the plurality of grooves 14.
- the p-type carrier extraction regions 26a, 26b, and 26c are the outermost grooves 14 as shown in FIGS. It is formed in a peripheral region further outside the groove formed on the side.
- the p-type carrier extraction region 26b is formed on the lower surface side of the p-type body region 20, and the p-type carrier extraction region 26c is formed so as to cover the side surface of the p body region 20. ing.
- the p-type carrier extraction regions 26b and 26c are formed on the lower surface of the p-type body region 20 and the side surfaces of the p-type body region 20 in the peripheral region where the holes are generated in a relatively large amount. It becomes possible to collect the holes more effectively.
- the p-type carrier extraction regions 26a, 26b, and 26c are formed to a position deeper than the depth of the groove 14. For this reason, since the holes are prevented from colliding with the lower surface of the trench 14, damage to the gate insulating film 16 formed near the bottom surface of the trench 14 can be suppressed.
- FIG. 3 is a diagram showing an impurity concentration profile in the depth direction in the trench gate power MOSFET 1 according to the first embodiment.
- the p-type carrier extraction region 26a is formed to a position deeper than the p-type body region 20 as shown in FIG. Further, the impurity concentration of the p-type carrier extraction region 26a is lower than the impurity concentration of the p-type body region 20. This makes it possible to perform efficient carrier extraction.
- FIG. 4 is a cross-sectional view for explaining the trench gate power MOSFET 2 according to the second embodiment.
- the trench gate power MOSFET 2 according to the second embodiment has a structure that is basically similar to the trench gate power MOSFET 1 according to the first embodiment. This is different from the trench gate power MOSFET 1 according to the first embodiment. That is, in the trench gate type MOSFET 2 according to the second embodiment, the p-type carrier extraction region 26d existing in the cell region is formed in two adjacent grooves of the plurality of grooves 14, as shown in FIG. It is formed in a part of the inter-groove region of the inter-groove region sandwiched.
- the trench gate power MOSFET 2 according to the second embodiment differs from the trench gate power MOSFET 1 according to the first embodiment in the configuration of the P-type carrier extraction region existing in the cell region! /
- the p-type carrier extraction region 26d, 26b, 26c is formed in a part of the region facing the p-type body region 20 in the n-type epitaxial layer 12. Therefore, it is possible to collect holes in the cell region and form the p-type carrier extraction regions 26d, 26b, and 26c in the region. For this reason, holes generated in the cell region can be efficiently collected through the p-type carrier extraction regions 26d, 26b, and 26c, and a trench that can further increase the switching speed.
- Gate power MOSFET is a part of the region facing the p-type body region 20 in the n-type epitaxial layer 12. Therefore, it is possible to collect holes in the cell region and form the p-type carrier extraction regions 26d, 26b, and 26c in the region. For this reason, holes generated in the cell region
- the p-type carrier extraction region 26d can be formed in a part or all of the region. As a result, the p-type carrier extraction region 26d can be formed only in the region where the hole is to be collected, and the on-resistance is not increased more than necessary.
- the p-type carrier extraction region 26d includes the groove 14 formed on the outermost side of the plurality of grooves 14 and the relevant one, although it is not clear from FIG. It is formed in all the regions sandwiched between the grooves 14 adjacent to the grooves 14.
- FIG. 5 is a cross-sectional view for explaining the trench gate power MOSFET 3 according to the third embodiment.
- the trench gate power MOSFET 3 according to the third embodiment has a structure that is basically similar to the trench gate power MOSFET 1 according to the first embodiment. This is different from the trench gate power MOSFET 1 according to the first embodiment. That is, in the trench gate part MOSFET 3 according to the third embodiment, the p-type carrier extraction region 26e existing in the cell region has two adjacent grooves 14 in the plurality of grooves 14 as shown in FIG. It is formed so as to cover the region between the grooves sandwiched between them. [0067] Thus, the trench gate power MOSFET 3 according to the third embodiment is different from the trench gate power MOSFET 1 according to the first embodiment in the configuration of the P-type carrier extraction region existing in the cell region!
- the cell region is formed.
- the p-type carrier extraction regions 26e, 26b, and 26c are formed in a part of the region facing the p-type body region 20 in the n-type epitaxial layer 12, the cell region is formed.
- the p-type carrier extraction regions 26e, 26b, and 26c are formed at the sites. For this reason, holes generated in the cell region can be efficiently recovered through the p-type carrier extraction regions 26e, 26b, and 26c, and a trench that can further increase the switching speed.
- Gate power MOSFET since the p-type carrier extraction regions 26e, 26b, and 26c are formed in a part of the region facing the p-type body region 20 in the n-type epitaxial layer 12, the cell region is formed.
- the p-type carrier extraction region 26e is sandwiched between two adjacent grooves 14 of the plurality of grooves 14 and these. Since it is formed so as to cover both the inter-groove regions, the area of the p-type carrier bow I cut-out region can be increased, and holes can be recovered more efficiently.
- the trench gate power MOSFET 4 (not shown) according to the fourth embodiment is a p-type carrier existing in a force cell region having a structure basically similar to that of the trench gate power MOSFET 1 according to the first embodiment.
- the configuration of the extraction region is different from that of the trench gate power MOSFET 1 according to the first embodiment. That is, in the trench gate power MOSFET 4 according to the fourth embodiment, the p-type carrier extraction region existing in the cell region is the trench gate power MOSFET 1 according to the first embodiment, the trench gate power MOSFET 2 according to the second embodiment, or the implementation.
- the trench gate power MOSFET 4 according to the fourth embodiment is different from the trench gate power MOSFETs 1, 2, and 3 according to the first to third embodiments in the configuration of the P-type carrier extraction region existing in the cell region.
- P-type carrier extraction region is formed in a part of the region facing the p-type body region 20 in the n-type epitaxial layer 12 in the n-type epitaxial layer 12 As a result, it is possible to collect holes in the cell region and form a p-type carrier extraction region in the region. As a result, holes generated in the cell region can be efficiently recovered through the P-type carrier extraction region, resulting in a trench gate power MOSFET that can further speed up the switching operation.
- holes are collected, and a p-type carrier extraction region appropriately selected from the above-described force of the p-type carrier extraction region is provided at the site. Since it becomes possible to arrange the p-type carrier extraction region, the holes can be collected more efficiently.
- FIG. 6 is a cross-sectional view for explaining the trench gate power MOSFET 5 according to the fifth embodiment.
- FIG. 7 is a plan view for explaining the trench gate power MOSFET 5 according to the fifth embodiment.
- the trench gate power MOSFET 5 includes an n-type epitaxial layer (first conductivity type semiconductor layer) 12 and a p-type body region 20 formed in the vicinity of the upper surface of the n-type epitaxial layer 12. (Second conductivity type body region), a plurality of grooves 14 formed so as to reach the n-type epitaxial layer 12 from the upper surface side of the p-type body region 20, and the plurality of grooves 14.
- a trench gate power MOSFET including a gate 18 and formed in the p-type body region 20 at a depth shallower than the depth of the p-type body region 20 and a source electrode 38 formed on the upper surface of the p-type body region.
- a p-type carrier extraction region 36a, 36b is formed on the lower surface of the second groove, connected to the source electrode 38 and reaching the n-type epitaxial layer 12 on the lower surface of the second groove. ing.
- the second groove is formed in the inter-groove region, and the p-type carrier extraction regions 36a and 36b are further formed on the lower surface of the second groove. Since it is formed, it is possible to collect holes in the cell region, and to form the p-type carrier extraction region 36a at the site. For this reason, holes generated in the cell region can be efficiently recovered through the p-type carrier extraction region 36a, and a trench gate power MOS FET that can further increase the switching speed is provided. can do.
- the second groove is an inter-groove region sandwiched between two adjacent grooves 14 of the plurality of grooves 14 as shown in FIG. Of these, it is formed in the inter-groove region.
- the p-type carrier bow I cut-out region 36a can be formed over the entire surface of the cell region, so that holes can be efficiently recovered. In this case, even if the p-type carrier extraction region 36a is formed over the entire cell region, it is possible to prevent the transistor operation from being adversely affected. Mona.
- the second groove is also formed in a peripheral region further outside the outermost groove of the plurality of grooves 14. Has been.
- the p-type carrier extraction region 36b is also formed in the peripheral region where the holes are generated in a relatively large amount, the holes can be collected more efficiently.
- the second groove formed in the peripheral region is wider and wider than the second groove formed in the cell region.
- the P-type carrier extraction region 36b formed in the peripheral region is deeper than the p-type carrier extraction region 36a formed in the cell region. Formed!
- the p-type carrier extraction region 36 a is formed to a position deeper than the depth of the groove 14.
- the portion of the p-type carrier extraction region 36a, 36b that is in contact with the second groove has a metal filled in the second groove.
- a p + type contact layer 24 is formed to reduce the contact resistance with the layer (source electrode 38).
- the holes collected in the p-type carrier extraction regions 36a and 36b can be efficiently discharged to the outside.
- FIG. 8 is a diagram showing an impurity concentration profile in the depth direction in the trench gate power MOSFET 5 according to the fifth embodiment.
- the p-type carrier extraction region 36a is formed to a position deeper than the p-type body region 20 as shown in FIG. Further, the impurity concentration of the p-type carrier extraction region 36 a is lower than the impurity concentration of the p-type body region 20. However, the P + type contact layer 24 has a higher impurity concentration than the p type body region 20. This makes it possible to perform efficient carrier extraction.
- FIG. 9 is a plan view for explaining the trench gate power MOSFET 6 according to the sixth embodiment.
- the trench gate power MOSFET 6 according to the sixth embodiment has the same structure as that of the trench gate power MOSFET 5 according to the fifth embodiment. This is different from the case of MOSFET5. That is, in the trench gate power MOSFET 6 according to the sixth embodiment, the grooves 14 are formed in a lattice shape as shown in FIG.
- the trench gate power MOSFET 6 according to the sixth embodiment differs from the trench gate power MOSFET 5 according to the fifth embodiment in the layout of the trench 14, but the second trench is located in the inter-groove region.
- P-type carrier extraction regions 36a and 36b are further formed on the lower surface of the second groove. Therefore, the p-type carrier extraction region 36a is formed in the cell region where holes are to be collected. It becomes possible. For this reason, holes generated in the cell region can be efficiently recovered via the p-type carrier extraction region 36a. Thus, a trench gate power semiconductor device capable of achieving a higher speed switching operation is obtained.
- the manufacturing method of the trench gate power MOSFET according to the seventh embodiment is a manufacturing method of the trench gate power MOSFET for manufacturing the trench gate power MOSFET 4 according to the above-described fourth embodiment.
- FIG. 10 to FIG. 12 are diagrams showing manufacturing steps in the method for manufacturing the trench gate power MOSFET according to the seventh embodiment.
- the trench gate power MOSFET manufacturing method according to the seventh embodiment includes the following (a) first step to (i) ninth step in this order, as shown in FIGS.
- n + type silicon substrate 10 having an n type epitaxial layer 12 formed on the upper surface is prepared (see FIG. 10 (a);).
- the impurity concentration of the n-type epitaxial layer 12 is, for example, 3 ⁇ 10 + 15 / cm 3 .
- a silicon oxide film M is selectively formed on the surface of the n-type epitaxial layer 12, and boron ions are implanted using this silicon oxide film M as a mask (for example, 2.6 X 10 1 3 cm 2 ), and boron ion implantation layers 25a, 25d, 25b, and 25c are formed.
- boron ions are implanted using this silicon oxide film M as a mask (for example, 2.6 X 10 1 3 cm 2 ), and boron ion implantation layers 25a, 25d, 25b, and 25c are formed.
- thermal annealing is performed (for example, 1100 ° C., 100 minutes) to form P-type diffusion layers 25a ′, 25d ′, 25b ′, and 25c ′ that become p-type carrier extraction regions (FIG. 10 (c) reference.).
- boron ions are implanted (for example, 1.5 ⁇ 10 13 cm 2 , 50 keV;) to form a boron ion implanted layer 19.
- Reference numeral 30 denotes a thermal oxide film having a thickness of about 20 to 40 nm.
- (e) Fifth step Next, thermal annealing is performed (for example, 1100 ° C., 45 minutes) to form the p-type body region 20 (see FIG. 11 (e)). At this time, the p-type carrier extraction regions 26a, 26d, 26b, and 26c are formed at the same time.
- grooves 14 are formed using a silicon oxide film (not shown) as a mask.
- a gate insulating film 16 is formed on the inner surface of the groove 14 by thermal oxidation, and then the inside of the groove is filled with polysilicon doped with phosphorus, and the upper surface is etched back, and further the upper surface is etched. the turned into thermal acid to form a gate 18 (FIG. 11 (f) reference.) 0
- boron ions are implanted into the portion to become the p + type contact region 24 (for example, 2 ⁇ 10 14 cm 2 ), and then thermal annealing is performed (for example, 900. C, 30 minutes) to form the p + type.
- the outer contour region 24 is formed (see Fig. 12 (g)).
- n + type source region 22 for example, 4 ⁇ 10 15 cm 2
- thermal annealing for example, 1000. C, 10 minutes
- An n + type source region 22 is formed (see FIG. 12 (h)).
- the insulating layer 28 is formed above the trench and unnecessary insulating layers are removed, and then the source electrode 32 is formed above the insulating layer 28. Further, the drain electrode 34 is formed on the back surface (see FIG. 12 (i)).
- the trench gate power MOSFET 4 according to the fourth embodiment can be manufactured through the steps as described above. Therefore, according to the method for manufacturing the trench gate power MOSFET according to the seventh embodiment, the trench gate power MOSFET 4 according to the fourth embodiment can be manufactured by a relatively easy method.
- FIG. 13 is a diagram showing each manufacturing step in the method for manufacturing a trench gate power MOSFET according to a modification of the seventh embodiment.
- the manufacturing method of the trench gate power MOSFET according to the modification of the seventh embodiment is a manufacturing method very similar to the manufacturing method of the trench gate power MOSFET according to the seventh embodiment, but the second step to the third step are the same. Is different. That is, the second to third steps in the method for manufacturing the trench gate power MOSFET according to the modification of the seventh embodiment are as follows.
- a silicon oxide film M is selectively formed on the surface of the n-type epitaxial layer 12, and boron ions, for example, are implanted in multiple stages using the silicon oxide film M as a mask (for example, 50 keV to 2 MeV. ;), Boron ion implanted layers 25a ", 25d", 25b ", 25c" are formed (see FIG. 13 (b ')).
- thermal annealing is performed (for example, 1000 ° C, 10 minutes) to form P-type diffusion layers 25 "', 25d"', 25b '", 25c'" 'that become p-type carrier extraction regions ( See Fig. 13 (c ');).
- boron ions are implanted in multiple stages in the second step, so that the thermal annealing in the third step is performed.
- the method for manufacturing a trench gate power MOSFET according to the eighth embodiment is a method for manufacturing the trench gate power MOSFET for manufacturing the trench gate power MOSFET 5 according to the fifth embodiment described above.
- FIG. 14 to FIG. 16 are diagrams showing respective manufacturing steps in the method for manufacturing the trench gate power MOSFET according to the eighth embodiment.
- the trench gate power MOSFET manufacturing method according to the eighth embodiment includes the following (a) first step to (i) ninth step in this order, as shown in FIGS.
- n + type silicon substrate 10 having an n type epitaxial layer 12 formed on the upper surface is prepared (FIG. 1). 4 See (a). ;).
- the impurity concentration of the n-type epitaxial layer 12 is, for example, 3 ⁇ 10 + 15 / cm 3 .
- the insulating layer 29 is selectively formed, and then, for example, boron ions are implanted from the surface of the n-type epitaxial layer 12 using the insulating layer 29 as a mask (for example, 1.5 X 10 13 cm " 2 o After that, thermal annealing is performed (for example, 1100 ° C., 45 minutes) to form the p-type body region 20 (see FIG. 14B).
- a silicon oxide film (not shown) is selectively formed on the surface of the n-type epitaxial layer 12, and the groove 14 is formed using the silicon oxide film as a mask.
- a gate insulating film 16 is formed on the inner surface of the trench 14 by thermal oxidation, and then the trench is filled with polysilicon doped with phosphorus, and the upper surface is etched back. further to Netsusani ⁇ the top, forming a gate 18 (FIG. 14 (c) reference.) 0
- arsenic ions are implanted into the region between the grooves 14 and 14 (for example, 4 ⁇ 10 15 cm 2 ) to form the arsenic ion implanted layer 21 (FIG. 15 (d)). reference.;).
- the insulating layer 28 is formed, and the second groove is formed at a predetermined position in the intermediate region and the peripheral region in the inter-groove region sandwiched between the groove 14 and the groove 14 by using the insulating layer 28 as a mask ( (See Figure 15 (e).)
- boron ions are implanted into the bottom of the second groove (for example, 2.6 ⁇ 10 15 cm ” 2 ;) to form boron ion implanted layers 35a and 35b (see FIG. 15 (f);). .
- the source electrode 38 is formed above the insulating layer 28 (see FIG. 16H). At this time the inside of the second groove is filled with the metal constituting the source electrode 38.
- drain electrode 34 is formed on the back surface (see FIG. 16 (i)).
- the trench gate power MOSFET 5 according to the fifth embodiment can be manufactured through the steps as described above. Therefore, according to the method for manufacturing the trench gate power MOSFET according to the eighth embodiment, the trench gate power MOSFET 5 according to the fifth embodiment can be manufactured by a relatively easy method.
- Embodiment 8 the method of manufacturing trench gate power MOSF ET5 according to Embodiment 5 has been described, but the present invention is not limited to this and relates to Embodiment 6. The same applies to the method of manufacturing the trench gate power MOSFET 6.
- the present invention has been described by taking a trench gate power MOSFET as an example.
- the present invention is not limited to this, and can be applied to a trench gate IGBT.
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Abstract
Description
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US12/094,312 US7939886B2 (en) | 2005-11-22 | 2005-11-22 | Trench gate power semiconductor device |
PCT/JP2005/021490 WO2007060716A1 (ja) | 2005-11-22 | 2005-11-22 | トレンチゲートパワー半導体装置 |
EP05809501.9A EP1959495B1 (en) | 2005-11-22 | 2005-11-22 | Trench gate power semiconductor device |
JP2007546318A JP5047805B2 (ja) | 2005-11-22 | 2005-11-22 | トレンチゲートパワー半導体装置 |
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2005
- 2005-11-22 WO PCT/JP2005/021490 patent/WO2007060716A1/ja active Application Filing
- 2005-11-22 JP JP2007546318A patent/JP5047805B2/ja active Active
- 2005-11-22 US US12/094,312 patent/US7939886B2/en active Active
- 2005-11-22 EP EP05809501.9A patent/EP1959495B1/en active Active
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Cited By (14)
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JP2010114152A (ja) * | 2008-11-04 | 2010-05-20 | Toyota Motor Corp | 半導体装置および半導体装置の製造方法 |
JP2013539906A (ja) * | 2010-09-14 | 2013-10-28 | シーエスエムシー テクノロジーズ ファブ1 カンパニー リミテッド | トレンチ垂直の二重拡散金属酸化物半導体トランジスター |
JP2012064686A (ja) * | 2010-09-15 | 2012-03-29 | Toshiba Corp | 半導体装置 |
JP2012164854A (ja) * | 2011-02-08 | 2012-08-30 | Denso Corp | 半導体装置およびその製造方法 |
US9490247B2 (en) | 2013-08-29 | 2016-11-08 | Hitachi, Ltd. | Semiconductor device and method for manufacturing same |
WO2015029175A1 (ja) * | 2013-08-29 | 2015-03-05 | 株式会社日立製作所 | 半導体装置およびその製造方法 |
JP6084695B2 (ja) * | 2013-08-29 | 2017-02-22 | 株式会社日立製作所 | 半導体装置の製造方法 |
JPWO2015029175A1 (ja) * | 2013-08-29 | 2017-03-02 | 株式会社日立製作所 | 半導体装置の製造方法 |
WO2015045563A1 (ja) * | 2013-09-25 | 2015-04-02 | 株式会社日立製作所 | 半導体装置およびこれを用いた電力変換装置 |
JP2018166150A (ja) * | 2017-03-28 | 2018-10-25 | 豊田合成株式会社 | 半導体装置の製造方法及び半導体装置の終端構造 |
US10879349B2 (en) | 2017-03-28 | 2020-12-29 | Toyoda Goset Co., Ltd. | Method for manufacturing semiconductor device and edge termination structure of semiconductor device |
CN113451388A (zh) * | 2020-03-24 | 2021-09-28 | 株式会社东芝 | 半导体装置 |
JP2021153127A (ja) * | 2020-03-24 | 2021-09-30 | 株式会社東芝 | 半導体装置 |
JP7263286B2 (ja) | 2020-03-24 | 2023-04-24 | 株式会社東芝 | 半導体装置 |
Also Published As
Publication number | Publication date |
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EP1959495A4 (en) | 2009-04-08 |
US7939886B2 (en) | 2011-05-10 |
JP5047805B2 (ja) | 2012-10-10 |
EP1959495B1 (en) | 2017-09-20 |
JPWO2007060716A1 (ja) | 2009-05-07 |
US20080315301A1 (en) | 2008-12-25 |
EP1959495A1 (en) | 2008-08-20 |
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