JP2012097356A - Apparatus and method for substrate treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for substrate treatment, which can improve vapor deposition uniformity and deposition rate.SOLUTION: In the apparatus for surface treatment, substrates are placed on a susceptor positioned within a treatment chamber, and a shower head supplies a gas to the substrate. A high-frequency power supply is connected to the first side surface of the shower head through a high-frequency line, and a variable capacitor is connected to a second side surface thereof directing in the opposite side to the first side surface of the shower head through an electric line. The high-frequency power supply is not applied to the electric line.

Description

  The present invention relates to a substrate processing apparatus and method, and more particularly to an apparatus and method for processing a substrate using plasma.

  Amorphous silicon solar cell, microcrystalline solar cell, thin film polycrystalline semiconductor (thin film), thin film semiconductor sensor (thin film sensor) In order to manufacture various electronic devices such as a semiconductor protective film and a display device, a deposition process for forming a thin film on a substrate is required. In order to perform such a deposition process, a plasma chemical vapor deposition apparatus is used.

  A general plasma enhanced chemical vapor deposition apparatus generates plasma by capacitively coupled plasma discharge. Two plate electrodes are provided at a predetermined interval in the processing chamber of the vapor deposition apparatus. One of the two electrodes is grounded and provided as a susceptor on which the substrate is placed. The other electrode is positioned to face the susceptor and is connected to a high frequency power source.

  In the deposition process, it is important to improve the deposition rate of the thin film in order to improve productivity and reduce costs. Recently, in order to improve the deposition rate of the thin film, 30 to 300 megahertz (MHz) very high frequency (VHF, very). high frequency) is applied to the electrode. However, when performing a plasma process using a super high frequency wave on a large substrate such as a large area solar panel, the deposition uniformity of each region of the substrate is greatly reduced.

US Pat. No. 6,363,881

  The present invention provides a substrate processing apparatus and method that can improve deposition uniformity and deposition rate.

  The present invention also provides a substrate processing apparatus and method capable of performing a vapor deposition process on a large substrate such as a large area solar panel.

  The objects of the present invention are not limited to the objects mentioned above. Other objects not mentioned can be clearly understood by those skilled in the art from the description below.

  The present invention provides a substrate processing apparatus. The substrate processing apparatus includes a processing chamber, a susceptor that is positioned in the processing chamber and on which the substrate is placed, a shower head that is positioned in the processing chamber and supplies gas to the substrate, and a first side surface of the shower head through a high-frequency line. And a variable capacitor connected to a second side facing the opposite side of the first side of the shower head through an electric line so that no high frequency power is provided to the electric line. Provide.

  The shower head is disposed as a single unit, a plurality of power supply rods are disposed on a first side surface of the shower head, and the high frequency line has a high frequency branch line connected to the power supply rod.

  The feeding rods are spaced apart from each other along the first side surface of the shower head. A plurality of connecting rods are spaced apart from each other along the second side surface of the shower head on the second side surface of the shower head, and the electric lines have electric branch lines respectively connected to the plurality of connecting rods. . The feeding rod and the connecting rod correspond to each other one to one and are arranged to face each other.

  The substrate processing apparatus further includes a high frequency matching unit provided to the high frequency line in a section between the high frequency power source and the high frequency branch line. Further, a variable inductor provided in the electrical line is further included.

  In the substrate processing apparatus according to another embodiment, a plurality of the shower heads are disposed at the same height and spaced apart from each other, and a single power supply rod is disposed on the first side surface of the shower head. A single connection rod is disposed on each of the second side surfaces of the head, the high-frequency line has a high-frequency branch line connected to the power feed rod, and the electric line is connected to the connection rod. Has a line. The feeding rod and the connecting rod are arranged so as to face each other in a one-to-one correspondence.

  The substrate processing apparatus further includes an insulating member that is located between the adjacent shower heads and electrically insulates the shower heads. Further included is a variable inductor provided in the electrical line.

  The distance between the upper surface of the susceptor and the bottom surface of the shower head is 10 mm or more and 20 mm or less.

  The present invention also provides a substrate processing method. In the substrate processing method, high frequency power is applied to the shower head through a feeding rod connected to the first side surface of the shower head, and the variable capacitor connected to the second side surface facing the opposite side to the first side surface of the shower head. While the size is adjusted and plasma is supplied from the showerhead to the substrate, and the plasma is supplied to the substrate, the capacitance of the variable capacitor is maintained at the first size during the first process time. During the second process time, the second size different from the first size is maintained.

  While the capacitance of the variable capacitor is maintained at the first size, the plasma density of the first region of the showerhead is higher than that of the second region of the showerhead and is maintained at the second size. In addition, the first area of the showerhead has a lower plasma density than the second area of the showerhead. The process time is different between the first process time and the second process time. The first region is adjacent to the first side surface of the shower head, and the second region is adjacent to the second side surface of the shower head. As for the capacity of the variable capacitor, the first size and the second size are alternately repeated.

  A plurality of the power supply rods are spaced apart from each other along the first side surface of the shower head, and the high-frequency power is simultaneously applied to the power supply rod.

  The high frequency power is 30 MHz to 60 MHz. While the plasma is supplied to the substrate, the internal pressure of the processing chamber in which the shower head is located is 1 Torr to 10 Torr.

  A high frequency power source is not provided to an electrical line in which the variable capacitor is installed and connected to the second side surface of the shower head. The shower head is provided as a single unit, and a plurality of the feeding rods are provided to apply the high frequency power at points separated from each other along the first side surface of the shower head.

  A substrate processing apparatus according to another embodiment of the present invention includes a processing chamber, a susceptor positioned in the processing chamber and on which a substrate is placed, a shower head positioned in the processing chamber and supplying gas to the substrate, and a high-frequency line. A high-frequency power source connected to the first side surface of the shower head through, a high-frequency matching unit installed in the high-frequency line in a section between the high-frequency power source and the shower head, and the first side surface of the shower head At least one of a variable capacitor and a variable inductor provided to an electric line connected to the second side facing the opposite side, and the electric line is provided not to be provided with a high frequency power source.

  The shower head is single, the plurality of power supply rods are arranged and spaced apart from each other along the first side surface of the shower head, and the high frequency lines are connected to the power supply rods, respectively. Has a line.

  According to the present invention, a film can be deposited with a uniform thickness over the entire area of the substrate.

  Further, according to the present invention, since the density of plasma generated according to the electrode region can be adjusted, a film can be deposited with a uniform thickness on a large substrate such as a large area solar panel.

It is a top view of the substrate processing apparatus of the present invention. It is a perspective view of the substrate processing apparatus of FIG. It is sectional drawing which shows schematically the internal structure of the substrate processing apparatus of FIG. It is a perspective view which shows the shower head by one Embodiment of this invention. It is a graph which shows the density of the plasma produced | generated according to the frequency of the applied electric power. It is a graph which shows the plasma density produced | generated according to the magnitude | size of the capacity | capacitance of a variable capacitor. It is a top view of the substrate processing apparatus by other embodiments of the present invention. It is sectional drawing which shows schematically the internal structure of the substrate processing apparatus of FIG. It is a perspective view which shows the shower head of FIG.

  Embodiments of the present invention can be modified in various forms, and the scope of the present invention is not limited by the embodiments described below. The embodiments are for explaining the present invention to those skilled in the art more fully, and the shapes of components in the drawings are also outlined for the sake of clarity.

  1 is a plan view of the substrate processing apparatus of the present invention, FIG. 2 is a perspective view of the substrate processing apparatus of FIG. 1, and FIG. 3 is a cross-sectional view schematically showing an internal configuration of the substrate processing apparatus of FIG. is there.

  As shown in FIGS. 1 to 3, the substrate processing apparatus 1 performs a deposition process on the substrate S. The substrate processing apparatus 1 includes a processing chamber 100, a susceptor 200, a shower head 300, a power supply unit 400, a phase variable member 500, and a gas distribution member 600.

  The processing chamber 100 provides a space where the deposition process is performed. The processing chamber 100 has a body 110 and a lid 120. The body 110 has an internal space 111 having an open upper surface, and the lid 120 covers the open upper surface of the body 110 to seal the internal space 111 from the outside. An opening for loading / unloading the substrate S is formed on one side wall of the body 110, and the opening is opened and closed by a slot valve 130. The slot valve 130 opens an opening when the substrate S is carried into the processing chamber 100 and when the substrate S is carried out of the processing chamber 100. The slot valve 130 closes the opening while the substrate processing process is performed in the processing chamber 100. A plurality of exhaust holes 112 are formed on the bottom surface of the body 110, and the plurality of exhaust holes 112 are connected to the exhaust member 140. The exhaust member 140 depressurizes the interior of the processing chamber 100 and maintains the process pressure at the process pressure when the process proceeds, and exhausts reaction part products generated in the process to the outside of the processing chamber 100. The exhaust member 140 is formed by an exhaust pump 141 and an exhaust line 142 that connects the exhaust hole 112 and the exhaust pump 141.

  The susceptor 200 is positioned inside the processing chamber 100 and supports the substrate S. The substrate S provided for the plasma process is, for example, a solar panel. Further, the substrate S is a large-area substrate, and may have a size in which the horizontal and vertical lengths each exceed 1 meter (m), or may have a size of 5 generations (1, 100 × 1, 300 mm) or more. Can be provided. The upper surface 210 of the susceptor 200 has a substantially rectangular shape and has a larger area than the substrate S. The susceptor 200 is moved up and down so that the height of the upper surface 210 is changed. In the present embodiment, the susceptor 200 rises when the substrate S is loaded / unloaded, and the upper surface 210 is positioned higher than the position when the process of the substrate S is performed. The susceptor 200 is grounded as one of two electrodes facing each other in order to generate plasma. A plurality of lift holes (not shown) are formed in the susceptor 200 through the upper surface 210 and the lower surface of the susceptor 200. A plurality of lift pins (not shown) are arranged in the plurality of lift holes, and the plurality of lift pins move up and down along the lift holes to load / unload the substrate S onto the susceptor 200. A heater (not shown) is disposed inside the susceptor 200, and the heater heats the substrate S to maintain the temperature of the substrate S at the process temperature.

  A shower head 300 is positioned on the susceptor 200. The shower head 300 is disposed as the other one of the two electrodes facing each other.

  FIG. 4 is a perspective view showing a shower head 300 according to an embodiment of the present invention.

  As shown in FIGS. 1 to 4, the shower head 300 is a single block having a substantially rectangular parallelepiped shape, and an inflow space 301 into which process gas flows is formed. The upper surface and the bottom surface of the shower head 300 correspond to the upper surface 210 of the susceptor 200 or are formed with a larger area. A plurality of supply holes 302 are formed on the upper surface of the shower head 300. The plurality of supply holes 302 are connected to the gas distribution member 600 and are provided as passages for supplying process gas to the inflow space 301. The bottom surface of the shower head 300 is arranged facing the top surface of the susceptor 200 and maintains a predetermined distance from the top surface 210 of the susceptor 200. In the present embodiment, the bottom surface of the shower head 300 is maintained at a distance of 10 mm to 20 mm from the upper surface of the susceptor 200. Generally, the discharge voltage required for plasma discharge is proportional to the process pressure inside the processing chamber 100 and the distance between the two electrodes. Therefore, as the process pressure increases, the discharge voltage for generating plasma also increases. However, there are practical limitations for increasing the magnitude of the discharge voltage. In the present invention, the distance between the susceptor 200 and the shower head 300 is maintained at 10 mm to 20 mm in consideration of such practical limitations. According to this, since the interval between the two electrodes 200 and 300 is maintained at the minimum interval even when the process pressure is increased, a discharge voltage required for plasma discharge can be applied even under a high process pressure condition. .

  The bottom surface of the shower head 300 may be anodized in order to prevent generation of arc due to plasma. A plurality of injection holes 303 are formed on the bottom surface of the shower head 300. The plurality of injection holes 303 are spaced apart from each other and are uniformly formed on the bottom surface of the shower head 300, and supply the process gas supplied to the inflow space 301 to the substrate S.

  A gas dispersion plate 310 is disposed in the inflow space 301 of the shower head 300. The gas dispersion plate 310 is spaced apart from the inner surface of the shower head 300 and is arranged alongside the bottom surface of the shower head 300. The gas distribution plate 310 may be provided as a single plate, or may be provided by arranging a plurality of plates spaced apart from each other at the same height. The gas dispersion plate 310 disperses the introduced gas so that the process gas introduced into the inflow space 301 is uniformly supplied to each region of the inflow space 301. The dispersed gas can be uniformly supplied to the substrate S through the plurality of injection holes 303. A plurality of through holes (not shown) are formed in the gas dispersion plate 310, and the process gas directly flows from the upper part to the lower part of the gas dispersion plate 310 through the plurality of through holes.

  A power supply unit 400 is connected to the first side surface 300 a of the shower head 300. The power supply unit 400 applies high frequency power to the shower head 300. The power supply unit 400 includes a high-frequency power source 410, a power feeding rod 420, a high-frequency matching unit 430, and a high-frequency line 440. The high frequency power supply 410 generates high frequency power. An RF power source can be used as the high frequency power source 410.

  The power supply rod 420 is connected to the first side surface 300 a of the shower head 300. The power supply rod 420 is a rod-shaped conductor, and is electrically connected to the shower head 300. In the present embodiment, a plurality of power supply rods 420 are spaced apart from each other along the first side surface 300a of the shower head 300, and are arranged in a row at the same height. Each of the power supply rods 420 a to 420 d applies high frequency power to the first side surface 300 a of the shower head 300. Since the feeding rods 420a to 420d apply high frequency power at a uniform interval along the lateral direction of the first side surface 300a of the shower head 300, the high frequency power is uniformly applied to the entire region of the shower head 300.

  The high frequency line 440 electrically connects the high frequency power source 410 and the power feeding rods 420a to 420d. In the present embodiment, the high frequency line 440 includes a high frequency main line 441 and a high frequency branch line 442. A high-frequency power source 410 is installed on the high-frequency main line 441 to apply high-frequency power. One end of each of the high-frequency branch lines 442a to 442d is connected to the branch end of the high-frequency main line 441, and the other end is connected to each of the feed rods 420a to 420d. The high-frequency branch lines 442a to 442d are connected to the feed rods 420a to 420d in a one-to-one correspondence. Therefore, high frequency power can be simultaneously applied to each of the power supply rods 420a to 420d. The high-frequency matching unit 430 is installed on the high-frequency main line 441 to minimize the power loss of the high-frequency power.

  The phase variable member 500 is connected to the second side surface 300 b of the shower head 300. The second side surface 300b of the shower head 300 is a surface facing the opposite side to the first side surface 300a. The phase variable member 500 includes a connecting rod 510, an electric line 520, a variable capacitor 530, and an inductor 540.

  The connecting rod 510 is connected to the second side surface 300 b of the shower head 300.

  The connecting rod 510 is provided by a rod-shaped conductor and is electrically connected to the shower head 300.

  In the present embodiment, a plurality of connecting rods 510 are arranged apart from each other along the second side surface 300b of the shower head 300, and are arranged in a row at the same height. Each of the connecting rods 510a to 510d is arranged to be in one-to-one correspondence with the power feeding rods 420a to 420d so as to face each other. The high frequency power applied to the shower head 300 is transmitted to each of the connecting rods 510a to 510d. The connecting rods 510a to 510d are connected to the electric line 520. The electric line 520 includes a main electric line 521 and a plurality of branch electric lines 522. A variable capacitor 530 and an inductor 540 are disposed on the main electric line 521, and the terminal is grounded. One end of each of the branching electric lines 522 a to 522 d is connected to the connecting rods 510 a to 510 d and the other end is connected to the branching end of the main electric line 521. The branch electric lines 522a to 522d are connected to the connecting rods 510a to 510d in a one-to-one correspondence. The variable capacitor 530 can adjust the capacity of the voltage and the charge that can be stored through the adjustment of the distance between the pair of electrode plates facing each other. As the inductor 540, a fixed inductor or a variable inductor is used.

  The gas distribution member 600 supplies process gas to the inflow space 301 of the shower head 300. The gas distribution member 600 includes a housing 610, an inflow port 620, and a connecting pipe 630. The housing 610 has a thin plate shape, and an internal space 611 is formed. The housing 610 is positioned above the shower head 300 and is arranged side by side with the shower head 300. An inflow port 620 is connected to the upper surface of the housing 610. The inflow port 620 is tubular and penetrates the lid 120 of the processing chamber 100 and is connected to the housing 610. The process gas flows into the internal space 611 of the housing 610 through the inflow port 620. The plurality of connecting pipes 630 are positioned between the housing 610 and the shower head 300 and connect the internal space 611 of the housing 610 and the inflow space 301 between the shower head 300. A plurality of connecting pipes 630 are arranged apart from each other. In this embodiment, when the plurality of connecting pipes 630 are viewed from above, they are arranged in a lattice pattern having a plurality of rows and columns. With the structure described above, the process gas stored outside the processing chamber 100 is supplied to the internal space 611 of the housing 610 through the inflow port 620, temporarily stays in the internal space 611 of the housing 610, and then connected to the plurality of connecting pipes 630. Is supplied to the inflow space 301 of the shower head 300.

  The process of performing the vapor deposition process on the substrate S using the substrate processing apparatus having the above-described configuration is as follows.

  When the substrate S is loaded on the upper surface 210 of the susceptor 200, the inside of the processing chamber 100 is sealed from the outside. The upper surface 210 of the susceptor 200 and the bottom surface of the shower head 300 are maintained at a distance of 10 mm to 20 mm. The exhaust member 140 exhausts the internal air of the processing chamber 100 to the outside and depressurizes the inside of the processing chamber 100. In the present embodiment, the internal pressure of the processing chamber 100 is maintained at 1 Torr or more and 10 Torr or less by reducing the pressure of the exhaust member 140. This is a relatively high pressure state as compared to the case where the internal pressure of the processing chamber 100 is generally maintained below 1 Torr in the plasma deposition process. When the internal pressure of the processing chamber 100 is maintained at less than 1 Torr, the mean free path of generated plasma ions (Mean Free Path) becomes longer, and damage (damage) due to ion collision occurs in the thin film. However, when the internal pressure of the processing chamber 100 is maintained at 1 Torr or more, the mean free path of plasma ions is shortened, and damage due to ion collision can be prevented. For this reason, the quality of the deposited thin film is improved.

  If the internal pressure of the processing chamber 100 is maintained at the pressure, the process gas is supplied from the gas distribution member 600 to the inflow space 301 of the shower head 300. Process gas in the inflow space 301 of the shower head 300 is supplied to the space between the susceptor 200 and the shower head 300 through a plurality of injection holes 303.

  While the process gas is supplied, high frequency power is applied to the shower head 300. The high frequency power is applied to the shower head 300 through the power supply rod 420 connected to the first side surface 300 a of the shower head 300. In the present embodiment, the applied high frequency power maintains a frequency of 30 MHz or more and 60 MHz or less. The process gas staying in the space between the susceptor 200 and the shower head 300 is dissociated by the applied high-frequency power and becomes a plasma state.

  FIG. 5 is a graph showing the density of plasma generated according to the frequency of applied power.

  As shown in FIG. 5, the applied high frequency power A generates a plasma with a higher overall density than the low frequency power B. However, the plasma generated by the high frequency power A has a problem that a large density difference is generated according to the region of the electrode. Such a density difference makes the thickness of the thin film deposited on the substrate S non-uniform.

  In the present invention, the capacity of the variable capacitor 530 connected to the second side surface 300b of the shower head 300 is adjusted in order to solve the plasma density difference generated by the application of the high frequency power. As the capacitance of the variable capacitor 530 changes, the region where relatively high density plasma is generated is changed.

  FIG. 6 is a graph showing the plasma density generated according to the capacity of the variable capacitor 530.

  As shown in FIGS. 3 and 6, the frequency phase is moved according to the capacitance of the variable capacitor 530, and the position of the region where plasma is generated at a high density is moved. In the present embodiment, when the capacitance of the variable capacitor 530 is maintained at the first size A, the plasma density is formed higher in the first region X1 of the showerhead 300 than in the second region X2. When the capacitance of the variable capacitor 530 is maintained at the second size B, the plasma density is higher in the second region X2 of the shower head 300 than in the first region X1. The first size A and the second size B are different from each other. The first region X1 of the shower head 300 is a region adjacent to the first side surface 300a of the shower head 300, and the second region X2 is a region adjacent to the second side surface 300b of the shower head 300. The variable capacitor 530 is maintained at the first size A during the first process time during which plasma is supplied to the substrate S, and is maintained at the second size B during the second process time. For this reason, plasma is generated at a uniform density A + B over the entire area of the shower head 300 while the first process time and the second process time elapse, and a thin film having a uniform thickness is formed in the entire area of the substrate S. Vapor deposited.

  While the plasma is supplied to the substrate S, the capacitance A of the variable capacitor 530 is alternately repeated between the first size A and the second size B. The first process time may be shorter or longer than the second process time. Such a change in the process conditions can be variously performed by the user in consideration of a position where a relatively high density plasma is generated and a density difference between the generated plasmas.

  In the present embodiment, a plurality of power supply rods 420 are spaced apart from each other along the lateral direction of the first side surface 300 a of the shower head 300, and high frequency power is simultaneously applied to each power supply rod 420. Since the plurality of high-frequency powers are placed at a constant distance and are simultaneously applied to the shower head 300, plasma is generated at a uniform density along the lateral direction of the first side surface 300a of the shower head 300.

  7 is a plan view of a substrate processing apparatus according to another embodiment of the present invention, FIG. 8 is a cross-sectional view schematically showing an internal configuration of the substrate processing apparatus of FIG. 7, and FIG. 9 is a shower head of FIG. FIG.

  As shown in FIGS. 7 to 9, a plurality of shower heads 300 are arranged unlike the embodiment. The shower heads 300 a to 300 d are arranged at the same height and spaced apart from each other in the first direction 11, and the shower heads 300 a to 300 d are arranged so that the lateral direction thereof is parallel to the second direction 12. The second direction 12 is a direction perpendicular to the first direction 11 when viewed from above, and each of the shower heads 300a to 300d is arranged in the second direction 12 rather than the width of the side surface arranged in the first direction 11. The width of the side is relatively long. A direction perpendicular to the first direction 11 and the second direction 12 is referred to as a third direction 13. The shower heads 300a to 300d each have the same size and shape. Each shower head 300a to 300d has a bottom surface having a smaller area than the top surface of the susceptor 200, and the plurality of shower heads 300a to 300d are combined with each other to form a bottom surface corresponding to the top surface of the susceptor 200. Inflow spaces 301a to 301d are formed in the shower heads 300a to 300d, respectively, and injection holes 303a to 303d are spaced apart and uniformly formed on the bottom surface thereof. A plurality of connecting pipes 630 are connected to the upper surfaces of the shower heads 300a to 300d, respectively, and supply process gas to the inflow spaces 301a to 301d.

  Feed rods 420a to 420d are connected to the first side surfaces A1 to A4 arranged in the first direction 11 of the shower heads 300a to 300d, respectively. A single power supply rod 420a to 420d is connected to each shower head 300a to 300d. The feed rods 420a to 420d are connected to a high frequency power supply 410 through a high frequency line 440, and apply high frequency power generated by the high frequency power supply 410 to each of the shower heads 300a to 300d. Single connecting rods 510a to 510d are coupled to the second side surfaces B1 to B4 arranged in parallel with the first side surfaces A1 to A4 of the shower heads 300a to 300d, respectively. The connecting rods 510a to 510d are connected to the variable capacitor 530 through the electric line 520. In each of the shower heads 300a to 300d, the power supply rods 420a to 420d and the connection rods 520a to 520d are in one-to-one correspondence and are arranged to face each other.

  Insulating members 330a to 330c are disposed between the adjacent shower heads 300a to 300d, respectively. The insulating members 330a to 330c are disposed between the side surfaces of the adjacent shower heads 300a to 300d facing each other. The insulating members 330a to 330c are made of an insulating material, and electrically insulate the adjacent shower heads 300a to 300d. When high frequency power is simultaneously applied to a single shower head 300 through a plurality of power supply rods 420a to 420d as in the shower head 300 shown in FIG. 1, the applied high frequency power is applied to the connecting rods 510a to 510d. Can be disturbed in the process of being transmitted to. However, in the present embodiment, a single power supply rod 420a to 420d is connected to each of the shower heads 300a to 300d, and insulating members 330a to 330c are disposed between the adjacent shower heads 300a to 300d, and the shower head 300a. Through 300d are electrically insulated from each other, so that the high frequency power applied to the shower heads 300a through 300d is prevented from being disturbed by the high frequency power applied to the other adjacent shower heads 300a through 300d.

  The high frequency power applied to each of the shower heads 300a to 300d dissociates the process gas remaining between the shower heads 300a to 300d and the susceptor 200, thereby generating plasma. The density of the generated plasma varies depending on the region in the second direction 12 of the shower heads 300a to 300d. In the present embodiment, when the capacitance of the variable capacitor 530 maintains the first size, the plasma density generated in the first region of the showerheads 300a to 300d is higher than the plasma density generated in the second region. When the capacitance of the variable capacitor 530 is maintained at the second size, the plasma density generated in the second region of the shower heads 300a to 300d is higher than the plasma density generated in the first region. The variable capacitor 530 is maintained at a first size during the first process time and is maintained at a second size during the second process time. For this reason, the whole density of the plasma generated in the first region and the second region of the shower heads 300a to 300d becomes uniform while the first process time and the second process time elapse. Further, high frequency power is simultaneously applied to the plurality of shower heads 300a to 300d arranged in the first direction 11, and the high frequency power applied to the adjacent shower heads 300a to 300d by the insulating members 330a to 330c is disturbed. Therefore, plasma can be formed with a uniform density in the first direction 11 between the first process time and the second process time. Thus, since the plasma is formed with a uniform density along the first direction 11 and the second direction 12 of the shower heads 330a to 330c between the first process time and the second process time, the thin film is uniform. It can be deposited on the substrate with any thickness.

  In the above embodiment, the density of the variable capacitor 530 is changed to change the plasma density according to the area of the shower head 300. However, unlike this, the capacity of the variable inductor is changed. Thus, the plasma density may be varied according to the region of the shower head 300.

  In the embodiment, the variable capacitor 530 and the variable inductor are both installed. However, only one of the variable capacitor 530 and the variable inductor may be provided. The variable capacitor 530 may be installed together with the fixed inductor, or both the variable inductor and the fixed capacitor may be installed.

  The foregoing detailed description illustrates the preferred embodiment of the present invention and can be used in a variety of other combinations, modifications, and environments. That is, changes or modifications can be made within the scope of the inventive concept disclosed in the present specification, the scope equivalent to the above-described disclosure, and / or the skill or knowledge of the industry. The above-described embodiments are for explaining the best state for embodying the technical idea of the present invention, and various modifications required in specific application fields and applications of the present invention are possible. Accordingly, the above detailed description of the invention should not be construed as limiting the invention to the disclosed embodiments, and the appended claims should be construed to include other embodiments. is there.

DESCRIPTION OF SYMBOLS 100 Processing chamber 200 Susceptor 300 Shower head 400 Power supply part 410 High frequency power supply 420 Feed rod 430 High frequency matching device 440 High frequency line 500 Phase variable member 510 Connection rod 520 Electric line 530 Variable capacitor 540 Inductor 600 Gas distribution member

Claims (24)

A processing chamber;
A susceptor positioned in the processing chamber and on which a substrate is placed;
A shower head located in the processing chamber for supplying gas to the substrate;
A high frequency power source connected to the first side of the shower head through a high frequency line;
A variable capacitor connected to a second side facing the first side of the showerhead through an electrical line;
A substrate processing apparatus, wherein a high-frequency power source is not provided to the electrical line. The shower head is single, and a plurality of power supply rods are arranged on the first side of the shower head,
The substrate processing apparatus according to claim 1, wherein the high-frequency line has a plurality of high-frequency branch lines respectively connected to the power supply rod. The substrate processing apparatus according to claim 2, wherein the power supply rods are spaced apart from each other along the first side surface of the shower head. A plurality of connecting rods are spaced apart from each other along the second side surface of the shower head on the second side surface of the shower head,
The substrate processing apparatus according to claim 2, wherein the electric line has an electric branch line connected to each of a plurality of connecting rods. 5. The substrate processing apparatus according to claim 4, wherein the power supply rod and the connection rod are in one-to-one correspondence with each other and are disposed to face each other. The substrate processing apparatus according to claim 2, further comprising a high-frequency matching unit provided to the high-frequency line in a section between the high-frequency power source and the high-frequency branch line. The substrate processing apparatus of claim 4, further comprising an inductor provided to the electrical line. A plurality of the shower heads are arranged at the same height and spaced apart from each other,
A single power supply rod is disposed on each first side surface of the shower head, and a single connection rod is disposed on each second side surface of the shower head,
The high-frequency line has a high-frequency branch line connected to the feed rod,
The substrate processing apparatus according to claim 1, wherein the electric lines include branch electric lines connected to the connecting rods. The substrate processing apparatus according to claim 8, wherein the power supply rod and the connection rod are arranged so as to correspond to each other on a one-to-one basis and face each other. The substrate processing apparatus according to claim 8, further comprising an insulating member that is located between the adjacent shower heads and electrically insulates the shower heads. The substrate processing apparatus of claim 8, further comprising an inductor provided to the electrical line. The substrate processing apparatus according to claim 1, wherein a distance between an upper surface of the susceptor and a bottom surface of the shower head is 10 mm or more and 20 mm or less. A high frequency power is applied to the shower head through a feeding rod connected to the first side of the shower head, and the size of the variable capacitor connected to the second side facing the opposite side of the first side of the shower head is adjusted. And supplying plasma from the showerhead to the substrate,
While the plasma is supplied to the substrate, the capacitance of the variable capacitor is maintained at a first size during a first process time and is different from the first size during a second process time. A substrate processing method characterized by being maintained in size. While the capacitance of the variable capacitor is maintained at the first size, the first area of the showerhead has a higher plasma density than the second area of the showerhead,
The substrate processing method of claim 13, wherein the plasma density of the first region of the showerhead is lower than that of the second region of the showerhead while the second size is maintained. The substrate processing method according to claim 14, wherein the first process time and the second process time are different from each other. The substrate processing method according to claim 14, wherein the first region is adjacent to a first side surface of the shower head, and the second region is adjacent to a second side surface of the shower head. 15. The substrate processing method according to claim 14, wherein the first capacitor and the second capacitor are alternately repeated in capacity of the variable capacitor. A plurality of the power supply rods are spaced apart from each other along the first side surface of the shower head,
The substrate processing method according to claim 14, wherein the high-frequency power is simultaneously applied to the feeding rod. The substrate processing method according to claim 14, wherein the high-frequency power is 30 MHz or more and 60 MHz or less. The substrate processing method according to claim 14, wherein an internal pressure of a processing chamber in which the shower head is located is 1 Torr or more and 10 Torr or less while plasma is supplied to the substrate. 14. The substrate processing method according to claim 13, wherein a high frequency power source is not provided to an electric line in which the variable capacitor is installed and connected to the second side surface of the shower head. The shower head is single,
The substrate processing method according to claim 13, wherein a plurality of the power supply rods are arranged and the high-frequency power is applied at points separated from each other along the first side surface of the shower head. A processing chamber;
A susceptor positioned in the processing chamber and on which a substrate is placed;
A shower head located in the processing chamber for supplying gas to the substrate;
A high frequency power source connected to the first side of the shower head through a high frequency line;
A high-frequency matching unit installed in the high-frequency line in a section between the high-frequency power source and the shower head;
And at least one of a variable capacitor and a variable inductor provided in an electric line connected to a second side facing the opposite side of the first side of the showerhead,
A substrate processing apparatus, wherein a high-frequency power source is not provided to the electrical line. The shower head is single,
A plurality of the power supply rods are arranged and spaced apart from each other along the first side surface of the shower head,
The substrate processing apparatus according to claim 23, wherein the high-frequency line has a high-frequency branch line connected to the power feed rod.

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