JP2009135360A - 半導体装置およびその製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 146
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 239000000758 substrate Substances 0.000 claims abstract description 20
- 239000012535 impurity Substances 0.000 claims description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- 238000005530 etching Methods 0.000 claims description 9
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 5
- 229920005591 polysilicon Polymers 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 abstract description 41
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- 150000004706 metal oxides Chemical class 0.000 abstract description 2
- 230000005669 field effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 11
- 230000005684 electric field Effects 0.000 description 5
- 238000005468 ion implantation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000002513 implantation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】縦形トレンチMOSFETにおいて、下面にドレイン電極111を有するN+形基板101の上面に形成されたN形エピタキシャル層102と、表面からN形エピタキシャル層102内に延在するゲートトレンチと、ゲートトレンチ内に絶縁膜を挟んで位置するゲート電極105と、N形エピタキシャル層102上に形成されたチャネル領域103と、チャネル領域103上に形成されたソース領域104と、ソース領域104上に形成されたソース電極110と、表面からN形エピタキシャル層102内に延在するソーストレンチと、ソーストレンチ内に絶縁膜を挟んで位置するトレンチソース電極108とを備え、ソース電極110がトレンチソース電極108と接触している。
【選択図】図1
Description
本発明の実施の形態1の半導体装置を、図1〜図5を用いて説明する。
本発明の実施の形態2の半導体装置を、図6,図7を用いて説明する。
本発明の実施の形態3の半導体装置を、図8を用いて説明する。
本発明の実施の形態4の半導体装置を、図9を用いて説明する。
本発明の実施の形態5の半導体装置を、図10を用いて説明する。
本発明の実施の形態6の半導体装置を、図11を用いて説明する。
Claims (20)
- 下面に裏面電極を有する半導体基板の上面に形成された第1導電形の第1半導体領域と、半導体装置表面から前記第1半導体領域内に延在するゲートトレンチと、前記ゲートトレンチ内に絶縁膜を挟んで位置するゲート電極と、前記ゲートトレンチに隣接し、前記第1半導体領域上に形成された第2導電形の第2半導体領域と、前記ゲートトレンチに隣接し、前記第2半導体領域上に形成された第1導電形の第3半導体領域と、前記第3半導体領域上に形成されたフィールド電極と、前記半導体装置表面から前記第1半導体領域内に延在するフィールドトレンチと、前記フィールドトレンチ内に絶縁膜を挟んで位置するトレンチフィールド電極とを備え、
前記フィールド電極が前記トレンチフィールド電極と接触していることを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記半導体装置表面から前記ゲートトレンチの底までの距離よりも前記半導体装置表面から前記フィールドトレンチの底までの距離が長いことを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記フィールド電極が前記フィールドトレンチ内で前記第2半導体領域と接触しているか、あるいは前記第2半導体領域と接触している第2導電形で前記第2半導体領域よりも不純物濃度が高いボディコンタクト領域と接触していることを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記半導体装置表面から前記ゲートトレンチの底までの距離が前記半導体装置表面から前記フィールドトレンチの底までの距離と同等であることを特徴とする半導体装置。 - 請求項4記載の半導体装置において、
前記ゲートトレンチ内の側面の絶縁膜よりも前記ゲートトレンチ内の底面の絶縁膜が厚いことを特徴とする半導体装置。 - 請求項5記載の半導体装置において、
前記第1半導体領域と前記第2半導体領域との境界面から前記ゲートトレンチ内の底面の絶縁膜までの距離よりも、前記ゲートトレンチ内の底面の絶縁膜の厚さの方が長いことを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記第2半導体領域表面に選択的に第2導電形で前記第2半導体領域よりも不純物濃度が高いボディコンタクト領域が形成されていることを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記フィールドトレンチの下の前記第1半導体領域内に、前記第1半導体領域よりも不純物濃度が低い第1導電形の第4半導体領域を備えることを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記フィールドトレンチの底が前記半導体基板内に達することを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記ゲートトレンチと前記フィールドトレンチとが平行の関係にあることを特徴とする半導体装置。 - 請求項10記載の半導体装置において、
前記ゲートトレンチと前記フィールドトレンチとが交互に位置することを特徴とする半導体装置。 - 請求項1記載の半導体装置において、
前記フィールドトレンチ電極はポリシリコンであることを特徴とする半導体装置。 - 下面に裏面電極を有する半導体基板の上面に形成された第1導電形の第1半導体領域と、前記第1半導体領域表面に選択的に形成された第2導電形の第2半導体領域と、前記第2半導体領域表面に選択的に形成された第1導電形の第3半導体領域と、前記第2半導体領域上に絶縁膜を挟んで位置するゲート電極と、前記第3半導体領域上に形成されたフィールド電極と、半導体装置表面から前記第1半導体領域内に延在するフィールドトレンチと、前記フィールドトレンチ内に絶縁膜を挟んで位置するトレンチフィールド電極とを備え、
前記フィールド電極が前記トレンチフィールド電極と接触していることを特徴とする半導体装置。 - 請求項13記載の半導体装置において、
前記フィールド電極が前記フィールドトレンチ内で前記第2半導体領域と接触しているか、あるいは前記第2半導体領域と接触している第2導電形で前記第2半導体領域よりも不純物濃度が高いボディコンタクト領域と接触していることを特徴とする半導体装置。 - 請求項13記載の半導体装置において、
前記第2半導体領域表面に選択的に第2導電形で前記第2半導体領域よりも不純物濃度が高いボディコンタクト領域が形成されていることを特徴とする半導体装置。 - 請求項13記載の半導体装置において、
前記フィールドトレンチの下の前記第1半導体領域内に、前記第1半導体領域よりも不純物濃度が低い第1導電形の第4半導体領域を備えることを特徴とする半導体装置。 - 請求項13記載の半導体装置において、
前記フィールドトレンチの底が前記半導体基板内に達することを特徴とする半導体装置。 - 請求項13記載の半導体装置において、
前記フィールドトレンチ電極はポリシリコンであることを特徴とする半導体装置。 - 半導体基板の上面に第1導電形の第1半導体領域を形成する工程と、半導体装置表面から前記第1半導体領域内に延在するゲートトレンチを形成する工程と、前記ゲートトレンチ内に絶縁膜を形成する工程と、前記ゲートトレンチ内にゲート電極を形成する工程と、前記半導体装置表面から前記第1半導体領域内に延在するフィールドトレンチを形成する工程と、前記フィールドトレンチ内に絶縁膜を形成する工程と、前記フィールドトレンチ内にトレンチフィールド電極を形成する工程と、前記ゲートトレンチに隣接した前記第1半導体領域上に第2導電形の第2半導体領域を形成する工程と、前記ゲートトレンチに隣接した前記第2半導体領域上に第1導電形の第3半導体領域を形成する工程と、前記第3半導体領域上と前記トレンチフィールド電極とに接触するフィールド電極を形成する工程とを備え、
前記ゲートトレンチと前記フィールドトレンチはシリコンエッチングによって形成することを特徴とする半導体装置の製造方法。 - 請求項19記載の半導体装置の製造方法において、
前記ゲートトレンチを形成する工程と前記フィールドトレンチを形成する工程とを同時に行うことを特徴とする半導体装置の製造方法。
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US12/326,392 US7928505B2 (en) | 2007-12-03 | 2008-12-02 | Semiconductor device with vertical trench and lightly doped region |
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