JP5518211B2 - 半導体素子、半導体装置及び半導体素子の製造方法 - Google Patents
半導体素子、半導体装置及び半導体素子の製造方法 Download PDFInfo
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- JP5518211B2 JP5518211B2 JP2012544119A JP2012544119A JP5518211B2 JP 5518211 B2 JP5518211 B2 JP 5518211B2 JP 2012544119 A JP2012544119 A JP 2012544119A JP 2012544119 A JP2012544119 A JP 2012544119A JP 5518211 B2 JP5518211 B2 JP 5518211B2
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- 239000004065 semiconductor Substances 0.000 title claims description 179
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 236
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- 229910021332 silicide Inorganic materials 0.000 claims description 32
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 32
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 12
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 10
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- 239000000463 material Substances 0.000 claims description 7
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- 229910052697 platinum Inorganic materials 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 6
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- 229910052709 silver Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- 229910000510 noble metal Inorganic materials 0.000 claims description 2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
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- 229910052750 molybdenum Inorganic materials 0.000 description 2
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- 239000010944 silver (metal) Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
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- 229910052726 zirconium Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 235000003332 Ilex aquifolium Nutrition 0.000 description 1
- 241000209027 Ilex aquifolium Species 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
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- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
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Description
図1は本発明の実施の形態1による半導体素子の電極の断面概略図であり、図2は本発明の実施の形態1による半導体装置の製造方法を説明する図である。半導体素子1は、ショットキーダイオード、MOS(Metal Oxide Semiconductor)トランジスタやバイポーラトランジタ等のパワー半導体素子等である。本発明は、半導体素子の電極形成部に金属シリサイドを含む多層構造の電極が形成される半導体素子に適用できるものである。半導体素子1は、半導体基板11の片方の表面に、金属シリサイド層2、第1金属層3、第2金属層4、第3金属層5、第4金属層6が、順次形成されている。なお、電極を形成する前に、半導体基板11には、半導体素子1の半導体素子構造部、すなわちショットキーダイオード、MOSトランジスタやバイポーラトランジタ等の電極を除いた構造が形成されている。図において、半導体素子1の半導体素子構造部は省略した。
[実施例1]
半導体素子1を模擬するものとして、厚さ500μmの炭化珪素基板を用意した。なお、所定の回路パターンが形成された炭化珪素基板を用いてもよい。金属シリサイド層2を形成するための金属層として、スパッタリング法を用いて厚さ50nmでニッケル層を形成し、その後真空雰囲気下で800℃、1時間の熱処理を行うことにより、厚さ50nm程度のニッケルシリサイド層を形成することができる。スパッタリング法を用いて、金属シリサイド層2の表面に、第1金属層3として厚さ200nmのTi層、Ti層表面に第2金属層4として厚さ200nmのNi層、Ni層表面に第3金属層5として厚さ200nmのCu層、第4金属層6としてCu層表面に厚さ200nmのAu層を順次形成した。この後、ダイシング工程にて5.0mm□(5.0mm平方、□は平方を意味する。)サイズに切断し、洗浄したものを、半導体素子1として用いた。
実施例1のサンプルと比較する比較サンプルの作製は、以下の方法で行った。厚さ500μmの炭化珪素基板11の片方の表面に、実施例1と同じ方法で、厚さ50nm程度のニッケルシリサイド層(金属シリサイド層2)を形成した。スパッタリング法を用いて、金属シリサイド層2の表面に、第1金属層3として厚さ200nmのTi層、第2金属層4としてTi層表面に厚さ200nmのNi層、表面金属層6としてNi層表面に厚さ200nmのAu層を順次形成した。この後、ダイシング工程にて5.0mm□サイズに切断し、洗浄したものを、半導体素子35(35a、図6参照)として用いた。半導体装置の製造方法は、実施例1と同様である。半導体素子35が実装基板15(15b)に実装された半導体装置40(40a、図6参照)は、3個作製した。
Claims (10)
- 金属ナノ粒子焼結層を介在させて実装基板に実装する半導体素子であって、
当該半導体素子における半導体素子構造部の少なくとも一方の表面に形成された金属シリサイド層と、
前記金属シリサイド層における前記半導体素子構造部と反対側の表面に形成された密着金属層と、
前記密着金属層における前記半導体素子構造部と反対側の表面に形成され、Niを含むNi含有金属層と、
前記Ni含有金属層における前記半導体素子構造部と反対側よりも外側に形成されたNiバリア金属層と、
前記Niバリア金属層における前記半導体素子構造部と反対側よりも外側に形成され、前記金属ナノ粒子焼結層に接続する表面金属層と、を備えた電極を有し、
前記Niバリア金属層は、前記Niが前記表面金属層への拡散を低減する金属であるCuを含んだことを特徴とする半導体素子。 - 金属ナノ粒子焼結層を介在させて実装基板に実装する半導体素子であって、
当該半導体素子における半導体素子構造部の少なくとも一方の表面に形成された金属シリサイド層と、
前記金属シリサイド層における前記半導体素子構造部と反対側の表面に形成された密着金属層と、
前記密着金属層における前記半導体素子構造部と反対側の表面に形成され、Niを含むNi含有金属層と、
前記Ni含有金属層における前記半導体素子構造部と反対側よりも外側に形成されたNiバリア金属層と、
前記Niバリア金属層における前記半導体素子構造部と反対側よりも外側に形成され、前記金属ナノ粒子焼結層に接続する表面金属層と、を備えた電極を有し、
前記Niバリア金属層は、前記Niが前記表面金属層への拡散を低減する金属を含み、
前記Niバリア金属層は、Cu金属、あるいはCuを含有した合金より構成されることを特徴とする半導体素子。 - 前記表面金属層は、貴金属を含むことを特徴とする請求項1または2に記載の半導体素子。
- 前記表面金属層は、Au、Pt、Ag、Ir、Cuの単金属あるいは1種以上を含有することを特徴とする請求項3記載の半導体素子。
- 前記密着金属層は、Ti、Cr、Ta、Nb、Mo、Zrの内の少なくとも1種を含有することを特徴とする請求項1乃至4のいずれか1項に記載の半導体素子。
- 前記半導体素子構造部がワイドバンドギャップ半導体材料により形成されていることを特徴とする請求項1乃至5のいずれか1項に記載の半導体素子。
- 前記ワイドバンドギャップ半導体材料は、炭化珪素であることを特徴とする請求項6記載の半導体素子。
- 実装基板と、前記実装基板に金属ナノ粒子焼結層を介在させて実装された半導体素子と、を備え、
前記半導体素子は、請求項1乃至7のいずれか1項に記載の半導体素子であることを特徴とする半導体装置。 - 金属ナノ粒子焼結層を介在させて実装基板に実装する半導体素子の製造方法であって、前記半導体素子における半導体素子構造部の少なくとも一方の表面に形成された金属シリサイド層を形成する金属シリサイド層形成工程と、
前記金属シリサイド層における前記半導体素子構造部と反対側の表面に形成された密着金属層を形成する密着金属層形成工程と、
前記密着金属層における前記半導体素子構造部と反対側の表面に、Niを含むNi含有金属層を形成するNi含有金属層形成工程と、
前記Ni含有金属層における前記半導体素子構造部と反対側よりも外側にNiバリア金属層を形成するNiバリア金属層形成工程と、
前記Niバリア金属層における前記半導体素子構造部と反対側よりも外側に、前記金属ナノ粒子焼結層に接続する表面金属層を形成する表面金属層形成工程と、を含み、
前記Niバリア金属層は、前記Niが前記表面金属層への拡散を低減する金属であるCuを含んだことを特徴とする半導体素子の製造方法。 - 金属ナノ粒子焼結層を介在させて実装基板に実装する半導体素子の製造方法であって、前記半導体素子における半導体素子構造部の少なくとも一方の表面に形成された金属シリサイド層を形成する金属シリサイド層形成工程と、
前記金属シリサイド層における前記半導体素子構造部と反対側の表面に形成された密着金属層を形成する密着金属層形成工程と、
前記密着金属層における前記半導体素子構造部と反対側の表面に、Niを含むNi含有金属層を形成するNi含有金属層形成工程と、
前記Ni含有金属層における前記半導体素子構造部と反対側よりも外側にNiバリア金属層を形成するNiバリア金属層形成工程と、
前記Niバリア金属層における前記半導体素子構造部と反対側よりも外側に、前記金属ナノ粒子焼結層に接続する表面金属層を形成する表面金属層形成工程と、を含み、
前記Niバリア金属層は、前記Niが前記表面金属層への拡散を低減する金属を含み、
前記Niバリア金属層は、Cu金属、あるいはCuを含有した合金より構成されることを特徴とする半導体素子の製造方法。
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