JP4232584B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
- Publication number
- JP4232584B2 JP4232584B2 JP2003317047A JP2003317047A JP4232584B2 JP 4232584 B2 JP4232584 B2 JP 4232584B2 JP 2003317047 A JP2003317047 A JP 2003317047A JP 2003317047 A JP2003317047 A JP 2003317047A JP 4232584 B2 JP4232584 B2 JP 4232584B2
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- Prior art keywords
- mos transistor
- region
- semiconductor device
- source
- drain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000004065 semiconductor Substances 0.000 title claims description 203
- 239000010410 layer Substances 0.000 claims description 181
- 238000009792 diffusion process Methods 0.000 claims description 106
- 239000011229 interlayer Substances 0.000 claims description 32
- 239000000758 substrate Substances 0.000 claims description 27
- 239000002344 surface layer Substances 0.000 claims description 27
- 239000012535 impurity Substances 0.000 claims description 20
- 239000005380 borophosphosilicate glass Substances 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 108091006146 Channels Proteins 0.000 description 16
- 238000010586 diagram Methods 0.000 description 14
- 230000015572 biosynthetic process Effects 0.000 description 12
- 229910000679 solder Inorganic materials 0.000 description 9
- 239000002131 composite material Substances 0.000 description 6
- 238000010030 laminating Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 108010075750 P-Type Calcium Channels Proteins 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000010931 gold Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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Description
また、上記半導体装置においては、複数あるソースへの下層配線のコンタクトを、特定領域に集積する。これによって、当該特定領域上において下層配線を一体化すると共に、層間絶縁膜を排除もしくは平坦にして、上層配線を積層することができる。また同時に、上層配線へのボンディング等のための面積も確保することができる。これによって、層間絶縁膜でのクラックの発生を防止し、当該半導体装置のショート不良や電流リークの発生を低減することができる。また、層間絶縁膜を排除もしくは平坦にして上層配線を積層することで、ボンディングワイヤやハンダボールとの密着性を向上することができる。
上記半導体装置は、例えば請求項4に記載のように、前記半導体基板が、第1導電型の半導体層を有し、前記第1型横型MOSトランジスタと第2型横型MOSトランジスタが、前記半導体層の表層部に形成される第2導電型のチャネル拡散領域と、前記チャネル拡散領域の表層部に形成される第1導電型のソース拡散領域と、前記チャネル拡散領域上の一部にゲート絶縁膜を介して当接配置されるゲート電極と、前記半導体層の表層部で、前記ソース拡散領域と離れて形成される第1導電型のドレイン拡散領域とを備える横型MOSトランジスタである構成とすることができる。
上記半導体装置は、例えば請求項7に記載のように、前記半導体基板が、第1導電型の半導体層を有し、前記横型MOSトランジスタが、前記半導体層の表層部に形成される第2導電型のチャネル拡散領域と、前記チャネル拡散領域の表層部に形成される第1導電型のソース拡散領域と、前記チャネル拡散領域上の一部にゲート絶縁膜を介して当接配置されるゲート電極と、前記半導体層の表層部で、前記ソース拡散領域と離れて形成される第1導電型のドレイン拡散領域とを備える横型MOSトランジスタである構成とすることができる。
図1〜4は、本発明の第1の実施形態における半導体装置200の模式図である。図1は、半導体装置200における素子構成と、下層配線の各素子要素へのコンタクトを示す平面図である。図2は、半導体装置200における下層配線を示す平面図である。図3は、半導体装置200における上層配線と、下層配線へのコンタクトを示す平面図である。また図4は、図3における一点差線A−A’に沿った断面図である。
縦型MOSトランジスタにおいては、図中の矢印で示したように、ソース拡散領域12からドレインである半導体層17に向かって、電子が縦方向に移動する。
第1実施形態の半導体装置は、横型MOSトランジスタと縦型MOSトランジスタが複合形成されてなる半導体装置であった。第2の実施形態は、同じ横型MOSトランジスタではあるが、素子要素の平面形状が異なる横型MOSトランジスタが複合形成されてなる半導体装置に関する。以下、本実施形態について図に基づいて説明する。
第2実施形態の半導体装置は、同じ横型MOSトランジスタではあるが、素子要素の平面形状が異なる2つの型の横型MOSトランジスタが複合形成されてなる半導体装置であった。第3の実施形態は、素子要素の平面形状は同じで、コンタクトの配置が異なる横型MOSトランジスタが複合形成されてなる半導体装置に関する。以下、本実施形態について図に基づいて説明する。
第1〜第3実施形態において、上層配線上において広いパッド領域を確保した半導体装置を示した。第4の実施形態においては、パッド領域をさらに平坦化した半導体装置を示す。以下、本実施形態について図に基づいて説明する。
20y 横型MOSトランジスタの形成部分
20ys 横型MOSトランジスタのソース領域
20yd 横型MOSトランジスタのドレイン領域
21ys 横型MOSトランジスタにおける下層配線のソース領域へのコンタクト
21yd 横型MOSトランジスタにおける下層配線のドレイン領域へのコンタクト
20t 縦型MOSトランジスタの形成部分
20ts 縦型MOSトランジスタのソース領域
20td 縦型MOSトランジスタのドレイン領域
21ts 縦型MOSトランジスタにおける下層配線のソース領域へのコンタクト
21td 縦型MOSトランジスタにおける下層配線のドレイン領域へのコンタクト
30y 第1型の横型MOSトランジスタの形成部分
30ys 第1型の横型MOSトランジスタのソース領域
30yd 第1型の横型MOSトランジスタのドレイン領域
31ys 第1型の横型MOSトランジスタにおける下層配線のソース領域へのコンタクト
31yd 第1型の横型MOSトランジスタにおける下層配線のドレイン領域へのコンタクト
30z 第2型の横型MOSトランジスタの形成部分
30zs 第2型の横型MOSトランジスタのソース領域
30zd 第2型の横型MOSトランジスタのドレイン領域
31zs 第2型の横型MOSトランジスタにおける下層配線のソース領域へのコンタクト
31zd 第2型の横型MOSトランジスタにおける下層配線のドレイン領域へのコンタクト
201,202,301,302,351,352,401,501,602 パッド領域
Claims (11)
- ソースの領域とドレインの領域が、各々、半導体基板に複数形成された、横型MOSトランジスタと縦型MOSトランジスタとが係合形成されてなる半導体装置であって、
前記半導体基板上に形成され、複数の前記ソース同士、および複数の前記ドレイン同士を電気的に並列に接続する上下二層の配線とを備えた半導体装置において、
前記縦型MOSトランジスタにおいて、前記ソースに接続する下層配線のコンタクトが当該縦型MOSトランジスタの特定領域に集積して配置され、前記ドレインに接続する下層配線のコンタクトがその周囲に配置され、
前記特定領域上の上層配線を、外部へ接続するためのパッド領域としたことを特徴とする半導体装置。 - 前記半導体基板が、第1導電型の第1半導体層と、前記第1半導体層上に形成され、第1導電型で前記第1半導体層より低濃度の第2半導体層を有し、
前記横型MOSトランジスタが、前記第2半導体層の表層部に形成される第2導電型のチャネル拡散領域と、前記チャネル拡散領域の表層部に形成される第1導電型のソース拡散領域と、前記チャネル拡散領域上の一部にゲート絶縁膜を介して当接配置されるゲート電極と、前記第2半導体層の表層部で、前記ソース拡散領域と離れて形成される第1導電型のドレイン拡散領域とを備える横型MOSトランジスタであり、
前記縦型MOSトランジスタが、前記第2半導体層の表層部に形成される第2導電型のチャネル拡散領域と、前記チャネル拡散領域の表層部に形成される第1導電型のソース拡散領域と、前記チャネル拡散領域上の一部にゲート絶縁膜を介して当接配置されるゲート電極と、前記第2半導体層の表層部から前記第1半導体層に達する深さで、前記ソース拡散領域と離れて形成される第1導電型のドレイン接続拡散領域とを備えた縦型MOSトランジスタであることを特徴とする請求項1に記載の半導体装置。 - ソースの領域とドレインの領域が半導体基板上で平面形状がほぼ正方形で交互に配置されてなる第1型横型MOSトランジスタと、ソースの領域とドレインの領域が半導体基板上で平面形状がほぼ長方形で交互に配置されてなる第2型横型MOSトランジスタとが、係合形成されてなる半導体装置であって、
前記半導体基板上に形成され、複数の前記ソース同士、および複数の前記ドレイン同士を電気的に並列に接続する上下二層の配線とを備えた半導体装置において、
前記第2型横型MOSトランジスタにおいて、前記ソースもしくはドレインのいずれか一方に接続する下層配線のコンタクトが当該第2型横型MOSトランジスタの特定領域に集積して配置され、前記ソースもしくはドレインの他方に接続する下層配線のコンタクトがその周囲に配置され、
前記特定領域上の上層配線を、外部へ接続するためのパッド領域としたことを特徴とする半導体装置。 - 前記半導体基板が、第1導電型の半導体層を有し、
前記第1型横型MOSトランジスタと第2型横型MOSトランジスタが、前記半導体層の表層部に形成される第2導電型のチャネル拡散領域と、前記チャネル拡散領域の表層部に形成される第1導電型のソース拡散領域と、前記チャネル拡散領域上の一部にゲート絶縁膜を介して当接配置されるゲート電極と、前記半導体層の表層部で、前記ソース拡散領域と離れて形成される第1導電型のドレイン拡散領域とを備える横型MOSトランジスタであることを特徴とする請求項3に記載の半導体装置。 - 前記第2型横型MOSトランジスタの特定領域においてコンタクトが集積されないソースもしくはドレインのいずれか一方の素子要素における拡散領域の不純物濃度が、前記第1型横型MOSトランジスタの同じ素子要素における拡散領域の不純物濃度に較べて、高く設定されることを特徴とする請求項4に記載の半導体装置。
- ソースの領域とドレインの領域が半導体基板上で平面形状がほぼ長方形で交互に配置されてなる横型MOSトランジスタが形成されてなる半導体装置であって、
前記半導体基板上に形成され、複数の前記ソース同士、および複数の前記ドレイン同士を電気的に並列に接続する上下二層の配線とを備えた半導体装置において、
前記ソースに接続する下層配線のコンタクトの一部が当該横型MOSトランジスタの第1特定領域に集積して配置され、
前記ドレインに接続する下層配線のコンタクトの一部が当該横型MOSトランジスタの第2特定領域に集積して配置され、
前記第1特定領域および第2特定領域上の各上層配線を、それぞれ外部へ接続するためのパッド領域としたことを特徴とする半導体装置。 - 前記半導体基板が、第1導電型の半導体層を有し、
前記横型MOSトランジスタが、前記半導体層の表層部に形成される第2導電型のチャネル拡散領域と、前記チャネル拡散領域の表層部に形成される第1導電型のソース拡散領域と、前記チャネル拡散領域上の一部にゲート絶縁膜を介して当接配置されるゲート電極と、前記半導体層の表層部で、前記ソース拡散領域と離れて形成される第1導電型のドレイン拡散領域とを備える横型MOSトランジスタであることを特徴とする請求項6に記載の半導体装置。 - 前記横型MOSトランジスタの第1特定領域および第2特定領域において、それぞれ、コンタクトが集積されないソースもしくはドレインのいずれか一方の素子要素における拡散領域の不純物濃度が、前記第1特定領域および第2特定領域の周りの部分に形成された同じ素子要素における拡散領域の不純物濃度に較べて、高く設定されることを特徴とする請求項7に記載の半導体装置。
- 前記パッド領域に、ワイヤがボンディングされることを特徴とする請求項1乃至8のいずれか1項に記載の半導体装置。
- 前記下層配線と前記上層配線の層間絶縁膜がBPSGであり、当該BPSGが化学的機械的研磨により平坦化されることを特徴とする請求項1乃至9のいずれか1項に記載の半導体装置。
- 前記上層配線が、化学的機械的研磨により平坦化されることを特徴とする請求項1乃至10のいずれか1項に記載の半導体装置。
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JP3355817B2 (ja) * | 1994-10-20 | 2002-12-09 | 株式会社デンソー | 半導体装置 |
US5925910A (en) * | 1997-03-28 | 1999-07-20 | Stmicroelectronics, Inc. | DMOS transistors with schottky diode body structure |
-
2003
- 2003-09-09 JP JP2003317047A patent/JP4232584B2/ja not_active Expired - Fee Related
- 2003-10-14 US US10/682,890 patent/US6958543B2/en not_active Expired - Fee Related
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JP2004158833A (ja) | 2004-06-03 |
US6958543B2 (en) | 2005-10-25 |
US20040075113A1 (en) | 2004-04-22 |
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