JP2016152275A - 半導体装置の製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005530 etching Methods 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 239000000758 substrate Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000003384 imaging method Methods 0.000 claims description 4
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 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
- 230000003321 amplification Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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Abstract
【解決手段】高低差を有する構造の上に絶縁部材を形成する工程と、前記絶縁部材に複数の開口を形成する工程とを有し、前記複数の開口を形成する工程は、マイクロローディング現象を伴う条件で前記絶縁部材をエッチングする第1工程と、前記第1工程の後に逆マイクロローディング現象を伴う条件で前記絶縁部材をエッチングする第2工程とを含み、前記構造の上面が露出する前に前記第1工程のエッチングを中止して前記第2工程のエッチングを開始する。
【選択図】図1
Description
Claims (13)
- 第1の高さと前記第1の高さよりも高い第2の高さとを有する構造の上に絶縁部材を形成する工程と、
前記絶縁部材に複数の開口を形成する工程と、を有し、
前記複数の開口を形成する工程は、
前記絶縁部材のエッチングを、開口の大きさが大きいものほど前記絶縁部材のエッチング量が大きくなる条件で行う第1工程と、
前記第1工程の後に、前記絶縁部材のエッチングを、開口の大きさが小さいものほど前記絶縁部材のエッチング量が大きくなる条件で行う第2工程と、
を含んでおり、
前記第1工程では、
前記構造の前記第1の高さの上面の上に、第1の幅を有する第1の開口であってその底面が前記第2の高さよりも高い第1の開口を形成し、
前記構造の前記第2の高さの上面の上に、前記第2の幅を有する第2の開口であってその底面が前記第2の高さよりも高い第2の開口を形成し、
前記構造の前記第1の高さの上面の上かつ前記第1の開口とは異なる位置に、前記第1の幅および前記第2の幅よりも大きい第3の幅を有する第3の開口であってその底面が前記第2の高さよりも高い第3の開口を形成し、
前記第2工程では、前記絶縁部材のうちの前記第3の開口の下の部分を残存させながら、前記絶縁部材のうちの前記第1の開口および前記第2の開口のそれぞれの下の部分を前記構造の前記第1の高さおよび前記第2の高さのそれぞれの上面が露出するように除去する
ことを特徴とする半導体装置の製造方法。 - 前記構造は、半導体基板と該半導体基板に形成されたMOSトランジスタとを含み、
前記第1の高さと前記第2の高さにより形成される前記構造の上面の高低差は、前記MOSトランジスタのゲート電極の厚さにしたがう
ことを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記第2工程では、前記絶縁部材のエッチング量が前記構造のエッチング量よりも大きくなる条件でエッチングを行う
ことを特徴とする請求項1または請求項2に記載の半導体装置の製造方法。 - 前記構造は、その表面が、前記絶縁部材とは異なる材料で構成された絶縁性の膜で覆われており、
前記第2工程では、前記絶縁性の膜はエッチングストッパとして作用する
ことを特徴とする請求項1から請求項3のいずれか1項に記載の半導体装置の製造方法。 - 前記絶縁部材は酸化シリコンで構成され、前記絶縁性の膜は窒化シリコンで構成されている
ことを特徴とする請求項4に記載の半導体装置の製造方法。 - 前記第1工程では、C4F8およびArを含むガス雰囲気の下でエッチングを行い、
前記第2工程では、C4F6およびO2を含むガスの雰囲気の下でエッチングを行う
ことを特徴とする請求項1から請求項5のいずれか1項に記載の半導体装置の製造方法。 - 前記第1の幅および前記第2の幅は、0.15μmから0.4μmの範囲内であり、
前記第3の幅は、0.4μmから2μmの範囲内である
ことを特徴とする請求項1から請求項6のいずれか1項に記載の半導体装置の製造方法。 - 前記複数の開口を形成する工程の後に前記複数の開口に金属部材を形成する工程をさらに有する
ことを特徴とする請求項1から請求項7のいずれか1項に記載の半導体装置の製造方法。 - 前記金属部材を形成する工程では、
前記複数の開口を形成する工程で形成された開口であって前記第1の開口に対応する開口と、前記複数の開口を形成する工程で形成された開口であって前記第2の開口に対応する開口とを金属部材で埋め、且つ、
前記複数の開口を形成する工程で形成された開口であって前記第3の開口に対応する開口に、金属部材を、該金属部材が該開口の側面および底部を覆いながら凹形状の上面を形成するように形成する
ことを特徴とする請求項8に記載の半導体装置の製造方法。 - 前記金属部材を形成する工程は、
前記複数の開口が形成された前記絶縁部材の上に、金属部材を、前記第3の開口に対応する前記開口の深さよりも小さい厚さで堆積する工程と、
前記堆積された金属部材の一部を、前記絶縁部材の上面が露出するように化学機械研磨によって除去する工程と、を含む
ことを特徴とする請求項7または請求項8に記載の半導体装置の製造方法。 - 前記第3の開口に対応する前記開口に形成された金属部材は、アライメントマークを成す
ことを特徴とする請求項8から請求項10のいずれか1項に記載の半導体装置の製造方法。 - 前記第3の開口に対応する前記開口に形成された金属部材は、ガードリングを成す
ことを特徴とする請求項8から請求項10のいずれか1項に記載の半導体装置の製造方法。 - 前記半導体装置は、光電変換部を備える固体撮像装置であり、
前記第3の開口に対応する前記開口に形成された金属部材は、光を制限するための遮光部材を成す
ことを特徴とする請求項8から請求項10のいずれか1項に記載の半導体装置の製造方法。
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