JP6729727B2 - 半導体装置および製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims description 95
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000758 substrate Substances 0.000 claims description 66
- 229910052751 metal Inorganic materials 0.000 claims description 53
- 239000002184 metal Substances 0.000 claims description 53
- 238000005530 etching Methods 0.000 claims description 14
- 238000007493 shaping process Methods 0.000 claims description 10
- 238000001312 dry etching Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 description 13
- 239000011229 interlayer Substances 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000005380 borophosphosilicate glass Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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Description
特許文献1 特開2010−251404号公報
Claims (12)
- 半導体基板と、
前記半導体基板の上面の上方に形成された金属電極と
を備え、
前記金属電極の側壁は、
前記半導体基板と接触する下側部分と、
前記下側部分よりも上方に形成され、前記半導体基板の上面に対する傾きが前記下側部分よりも小さい上側部分と
を有し、
前記半導体基板に形成された活性領域を更に備え、
前記金属電極は、前記半導体基板の上面において前記活性領域よりも外側に形成されたフィールドプレートであり、
前記半導体基板の上面の上方に形成され、一部の領域の上方に前記フィールドプレートが形成された絶縁膜を更に備え、
前記フィールドプレートで覆われていない前記絶縁膜の領域に窪みが形成され、前記窪みの側壁の前記半導体基板の上面に対する傾きは、前記フィールドプレートの側壁の前記下側部分の傾きより小さく、
前記フィールドプレートの側壁の前記上側部分は上側に凸の形状である
半導体装置。 - 前記フィールドプレートの側壁の前記下側部分の、前記半導体基板の上面に対する傾きが90度以下、60度以上である
請求項1に記載の半導体装置。 - 前記フィールドプレートの側壁は、前記下側部分と前記上側部分との間に配置された、前記半導体基板の上面に対する傾きが不連続に変化する特異点を有する
請求項1または2に記載の半導体装置。 - 前記特異点は、前記フィールドプレートの下面からの高さが、前記フィールドプレートの厚みの2割以上、8割以下の範囲となるように配置される
請求項3に記載の半導体装置。 - 前記半導体基板の上面の上方には、同一の厚みの第1のフィールドプレートおよび第2のフィールドプレートが形成され、
前記第1のフィールドプレートの下端および前記第2のフィールドプレートの下端の距離は、前記フィールドプレートの厚みより小さい
請求項1から4のいずれか一項に記載の半導体装置。 - 前記金属電極は、前記半導体基板の上面の上方に形成された第1のフィールドプレートおよび第2のフィールドプレートを含み、
前記第1のフィールドプレートおよび前記第2のフィールドプレートの対向する2つの側壁は非対称な断面形状を有する
請求項1から4のいずれか一項に記載の半導体装置。 - 前記半導体基板の上面には、第1のフィールドプレートおよび第2のフィールドプレートが形成され、
それぞれの前記フィールドプレートの下方には第1導電型のガードリングが形成され、
2つのフィールドプレートの向かい合う2つの側壁のうち、一方の側壁の下端が前記ガードリングの端部から突出する長さは、他方の側壁の下端が前記ガードリングの端部から突出する長さよりも大きい
請求項1から4のいずれか一項に記載の半導体装置。 - 半導体装置の製造方法であって、
半導体基板に活性領域を形成する段階と、
前記半導体基板の上面の上方に絶縁膜を形成する絶縁膜形成段階と、
前記半導体基板の上面の上方に金属電極を形成する電極形成段階であって、前記金属電極は、前記半導体基板の上面において前記活性領域よりも外側に形成されたフィールドプレートである電極形成段階と、
を備え、
前記電極形成段階において、前記金属電極の側壁に、前記半導体基板と接触する下側部分と、前記下側部分よりも上側に配置され、前記半導体基板の上面に対する傾きが前記下側部分よりも小さい上側部分とを形成し、
前記フィールドプレートで覆われていない前記絶縁膜の領域に窪みが形成され、前記窪みの側壁の前記半導体基板の上面に対する傾きは、前記フィールドプレートの側壁の前記下側部分の傾きより小さい製造方法。 - 前記電極形成段階は、
前記金属電極を形成すべき領域に金属膜を形成する金属膜形成段階と、
前記金属膜の上方に、パターニングされたレジスト膜を形成するレジスト膜形成段階と、
形成すべき前記金属電極の側壁の形状に応じて、前記レジスト膜の側壁の形状を整形する整形段階と、
側壁形状を整形した前記レジスト膜を用いて前記金属膜をドライエッチングするエッチング段階と
を有する請求項8に記載の製造方法。 - 前記整形段階では、形成すべき前記金属電極の側壁の形状に応じた条件で、前記レジスト膜を加熱する
請求項9に記載の製造方法。 - 前記金属電極は、前記半導体基板の上面の上方に形成された第1のフィールドプレートおよび第2のフィールドプレートを含み、
前記第1のフィールドプレートおよび前記第2のフィールドプレートの対向する2つの側壁は非対称な断面形状を有する
請求項8から10のいずれか一項に記載の製造方法。 - 前記半導体基板の上面には、第1のフィールドプレートおよび第2のフィールドプレートが形成され、
それぞれの前記フィールドプレートの下方には第1導電型のガードリングが形成され、
2つのフィールドプレートの向かい合う2つの側壁のうち、一方の側壁の下端が前記ガードリングの端部から突出する長さは、他方の側壁の下端が前記ガードリングの端部から突出する長さよりも大きい
請求項8から10のいずれか一項に記載の製造方法。
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JPS62136066A (ja) | 1985-12-09 | 1987-06-19 | Mitsubishi Electric Corp | 半導体装置の製造方法 |
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