JP5309058B2 - トレンチ金属酸化膜半導体素子及び終端構造の製造方法 - Google Patents
トレンチ金属酸化膜半導体素子及び終端構造の製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 229910044991 metal oxide Inorganic materials 0.000 title claims description 18
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- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 6
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- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
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- H01L29/8725—Schottky diodes of the trench MOS barrier type [TMBS]
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Description
(1)空乏境界が平坦であり、空乏境界の湾曲領域を活性領域から遠く離すことができる。このような特性により早期の電圧降伏現象を防止することができる。
(2)本発明に基づく終端構造に逆バイアス電圧を印加することにより生じる漏れ電流は、従来のLOCOS及びガードリングにより構成される終端構造より小さい(8.8%対12.8%)。
(3)本発明に基づく終端構造を有するトレンチMOS素子は、従来より単純なプロセスで製造できる。本発明によれば、フォトマスクプロセスを減らすことができる。
Claims (8)
- トレンチ金属酸化膜半導体素子及び終端構造を同時に製造するトレンチ金属酸化膜半導体素子及び終端構造の製造方法において、
半導体基板を準備する工程と、
上記半導体基板の活性領域内の上記トレンチ金属酸化膜半導体素子を形成するための複数の第1のトレンチと、該第1のトレンチからメサを介して離間し、該活性領域の境界から該半導体基板の端部に亘る上記終端構造を形成するための第2のトレンチとを形成する工程と、
上記複数の第1のトレンチ及び第2のトレンチが形成された半導体基板の全領域にゲート酸化層を形成するための熱酸化プロセスを行う工程と、
上記ゲート酸化層が形成された上記複数の第1のトレンチ及び第2のトレンチに第1の導電材料を埋め込み、第1の導電層を形成する工程と、
上記半導体基板のメサの表面に形成されたゲート酸化層を停止層として用いて、該メサ上の上記第1の導電層に対してエッチバックプロセスを行い、上記第1のトレンチ内に該第1の導電層を残すとともに、上記第2のトレンチの側壁にスペーサを形成する工程と、
上記エッチバックプロセスが行われた半導体基板のメサの表面を停止層として用いて、上記メサ上のゲート酸化層を除去する工程と、
上記第1の導電層の一部を消費することによって導電層間酸化層を形成するために、上記ゲート酸化層が除去された上記半導体基板のメサの表面及び上記スペーサを含む上記第1の導電層の表面に対して熱酸化プロセスを行う工程と、
上記半導体基板のメサの表面を停止層として用いて、上記メサ上の導電層間酸化層を除去する工程と、
上記メサ上の導電層間酸化層が除去された半導体基板の全領域に終端構造酸化層を形成する工程と、
上記終端構造酸化層上に、絶縁領域を画定し、上記活性領域から上記スペーサの一部までの領域を露出するフォトレジストパターンを形成する工程と、
上記フォトレジストパターンをマスクとして用いて、上記終端構造酸化層の露出された領域をエッチングする工程と、
上記フォトレジストパターンを剥離する工程と、
上記フォトレジストパターンが剥離された半導体基板の背面を露出させるために、該半導体基板の背面に形成された不要な層を除去する工程と、
上記不要な層が除去された半導体基板の上面に第1の電極を形成し、背面に第2の電極を形成するために、該半導体基板の全領域に第2の導電材料層を形成する工程と、
上記第2の導電材料層上に、上記活性領域及び上記導電層間酸化層を介して上記スペーサに接続し、空乏領域の湾曲領域が上記活性領域の境界から所定の長さ離間するように、上記終端構造酸化層の一部に亘って延長して形成される上記第1の電極を画定するためのフォトレジストパターンを形成する工程と、
上記第2の導電材料層の露出された部分をエッチングし、上記第1の電極を形成する工程とを有し、
上記第1の導電材料は、多結晶シリコン及び非晶質シリコンからなるグループから選択され、
上記終端構造酸化層の材料は、LPTEOS、PETEOS及びO 3 −TEOSからなるグループから選択されることを特徴とするトレンチ金属酸化膜半導体素子及び終端構造の製造方法。 - 上記半導体基板は、最上面に形成され、p型導電性不純物が高濃度にドープされた第1の層と、該第1の層の下層に形成され、p型導電性不純物が低濃度にドープされた第2の層と、該第2の層の下層に形成され、n型導電性不純物が低濃度にドープされた第3の層と、該第3の層の下層に形成され、n型導電性不純物が高濃度にドープされたベース基板と、該第1の層の内部及び該第2の層の上部にn型導電性不純物を高濃度にドープして形成された複数の領域とを備える二重拡散金属酸化膜半導体素子用の半導体基板であることを特徴とする請求項1記載のトレンチ金属酸化膜半導体素子及び終端構造の製造方法。
- 上記半導体基板は、最上層に形成され、p型導電性不純物が高濃度にドープされた第1の層と、該第1の層の下層に形成され、p型導電性不純物が低濃度にドープされた第2の層と、該第2の層の下層に形成され、n型導電性不純物が低濃度にドープされた第3の層と、該第3の層の下層に形成され、n型導電性不純物が高濃度にドープされた第4の層と、該第4の層の下層に形成され、p型導電性不純物が高濃度にドープされたベース基板と、該第1の層の内部及び該第2の層の上部にn型導電性不純物を高濃度にドープして形成された複数の領域とを備える絶縁ゲート型バイポーラトランジスタ素子用の半導体基板であることを特徴とする請求項1記載のトレンチ金属酸化膜半導体素子及び終端構造の製造方法。
- 上記複数の第1のトレンチ及び第2のトレンチを形成する工程は、
上記半導体基板に酸化層を形成する工程と、
上記酸化層上に、上記複数の第1のトレンチ及び第2のトレンチを画定するためのフォトレジストパターンを形成する工程と、
上記フォトレジストパターンを上記酸化層に転写するための異方性エッチングを行う工程と、
上記フォトレジストパターンを除去する工程と、
上記酸化層をハードマスクとして用いて異方性エッチングを行い、上記半導体基板をエッチングする工程と、
上記酸化層を除去する工程とを有することを特徴とする請求項1記載のトレンチ金属酸化膜半導体素子及び終端構造の製造方法。 - 上記ゲート酸化層の厚さは、150Å〜3000Åであることを特徴とする請求項1記載のトレンチ金属酸化膜半導体素子及び終端構造の製造方法。
- 上記半導体基板の背面の不要な層は、上記ゲート酸化層、上記第1の導電材料、上記導電層間酸化層及び上記終端構造酸化層を含むことを特徴とする請求項1記載のトレンチ金属酸化膜半導体素子及び終端構造の製造方法。
- 上記第1の電極を画定するためのフォトレジストパターンを形成する工程は、ソース電極を画定することを特徴とする請求項2記載のトレンチ金属酸化膜半導体素子及び終端構造の製造方法。
- 上記第1の電極を画定するためのフォトレジストパターンを形成する工程は、エミッタ電極を画定することを特徴とする請求項3記載のトレンチ金属酸化膜半導体素子及び終端構造の製造方法。
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-
2000
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2001
- 2001-09-21 EP EP01122745A patent/EP1191602A3/en not_active Ceased
- 2001-09-24 CN CNB011416793A patent/CN1211843C/zh not_active Expired - Lifetime
- 2001-09-25 JP JP2001292503A patent/JP4685297B2/ja not_active Expired - Fee Related
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CN1211843C (zh) | 2005-07-20 |
EP1191602A3 (en) | 2004-12-29 |
JP2002208711A (ja) | 2002-07-26 |
JP2010161395A (ja) | 2010-07-22 |
EP1191602A2 (en) | 2002-03-27 |
CN1348203A (zh) | 2002-05-08 |
US6309929B1 (en) | 2001-10-30 |
JP4685297B2 (ja) | 2011-05-18 |
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