JP2016006840A - 半導体装置および半導体装置の製造方法 - Google Patents
半導体装置および半導体装置の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 194
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 57
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 537
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 537
- 239000010703 silicon Substances 0.000 claims abstract description 537
- 239000000758 substrate Substances 0.000 claims abstract description 495
- 238000005530 etching Methods 0.000 claims abstract description 108
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims description 72
- 238000000034 method Methods 0.000 claims description 62
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 239000011159 matrix material Substances 0.000 claims description 7
- 238000001039 wet etching Methods 0.000 abstract description 27
- 239000010410 layer Substances 0.000 description 181
- 238000003384 imaging method Methods 0.000 description 86
- 239000000243 solution Substances 0.000 description 66
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 14
- 238000009792 diffusion process Methods 0.000 description 9
- 238000010030 laminating Methods 0.000 description 8
- 238000005286 illumination Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 3
- 239000012212 insulator Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 238000007747 plating Methods 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Abstract
【解決手段】面方位が(100)または(110)の第1の面と、該第1の面の反対側の第2の面とを有する第1のシリコン基板と、第3の面と、該第3の面の反対側の面方位が(111)の第4の面とを有する第2のシリコン基板とにおける第2の面と第3の面とを対向させて接合した後に、第1の面から第2の面に向けて予め定めた厚さのシリコンをエッチングして、第1のシリコン基板を薄化する。
【選択図】図1
Description
以下、本発明の実施形態について、図面を参照して説明する。図1は、本第1の実施形態による半導体装置の概略構造を示した断面図である。本第1の実施形態の半導体装置100は、2枚のシリコン基板(第1のシリコン基板11と第2のシリコン基板12)を積層することによって構成されている。なお、本第1の実施形態の半導体装置100は、ウエハ基板内に複数形成されるが、図1においては、説明を容易にするため、1つの半導体装置100が製造されるものとして説明する。
次に、第2の実施形態の半導体装置について説明する。本第2の実施形態の半導体装置は、第2のシリコン基板に酸化膜を形成することによって、ウエットエッチング法において用いるTMAH溶液における酸化膜に対する高い選択比を利用して、第2のシリコン基板の少ないエッチングも回避する構成である。図2は、本第2の実施形態による半導体装置の概略構造を示した断面図である。本第2の実施形態の半導体装置200も、図1に示した第1の実施形態の半導体装置100と同様に、2枚のシリコン基板(第1のシリコン基板11と第2のシリコン基板22)を積層することによって構成されている。また、本第2の実施形態の半導体装置200も、第1の実施形態の半導体装置100と同様に、ウエハ基板内に複数形成されるが、図2においても、説明を容易にするため、1つの半導体装置200が製造されるものとして説明する。
次に、第3の実施形態の半導体装置について説明する。本第3の実施形態の半導体装置は、第1のシリコン基板に、入射する光に応じた電荷信号を発生するフォトダイオードなどの光電変換部を備えた画素を2次元の行列状に複数配置した画素部を形成した裏面照射型の固体撮像装置の構成である。図3は、本第3の実施形態による半導体装置(裏面照射型の固体撮像装置)の概略構造を示した断面図である。本第3の実施形態の半導体装置300(以下、「固体撮像装置300」という)も、図1に示した第1の実施形態の半導体装置100と同様に、2枚のシリコン基板(第1のシリコン基板31と第2のシリコン基板12)を積層することによって構成されている。また、本第3の実施形態の固体撮像装置300も、第1の実施形態の半導体装置100と同様に、ウエハ基板内に複数形成されるが、図3においても、説明を容易にするため、1つの固体撮像装置300が製造されるものとして説明する。
次に、第4の実施形態の半導体装置について説明する。本第4の実施形態の半導体装置も、第3の実施形態の固体撮像装置300と同様に、第1のシリコン基板にフォトダイオードなどの光電変換部を備えた画素が2次元の行列状に複数配置された画素部を形成した裏面照射型の固体撮像装置の構成である。そして、本第4の実施形態の半導体装置は、第2のシリコン基板にも、本第4の実施形態の半導体装置の機能(動作)を実現する回路要素が形成された構成である。図4は、本第4の実施形態による半導体装置(裏面照射型の固体撮像装置)の概略構造を示した断面図である。本第4の実施形態の半導体装置400(以下、「固体撮像装置400」という)も、図1に示した第1の実施形態の半導体装置100や図3に示した第3の実施形態の固体撮像装置300と同様に、2枚のシリコン基板(第1のシリコン基板41と第2のシリコン基板42)を積層することによって構成されている。また、本第4の実施形態の固体撮像装置400も、第1の実施形態の半導体装置100や第3の実施形態の固体撮像装置300と同様に、ウエハ基板内に複数形成されるが、図4においても、説明を容易にするため、1つの固体撮像装置400が製造されるものとして説明する。
300,400・・・固体撮像装置(半導体装置)
11,31,41・・・第1のシリコン基板
111・・・デバイス層(第1のシリコン基板)
112・・・シリコン支持基板層(第1のシリコン基板)
113・・・BOX層(第1のシリコン基板)
114・・・配線層(画素部)
115・・・酸化膜(画素部)
PD・・・フォトダイオード(画素部)
416・・・接続電極(接続部)
12,22,42・・・第2のシリコン基板
121・・・シリコン層(第2のシリコン基板)
222・・・酸化膜(酸化膜)
223・・・酸化膜(酸化膜)
Tr・・・トランジスタ(処理回路)
422・・・配線層(処理回路)
423・・・酸化膜(処理回路)
424・・・接続パット(接続部)
13,43・・・接合層
131・・・樹脂層(接合層)
431・・・接続電極層(接合層)
Claims (11)
- 薄化した第1のシリコン基板と、該第1のシリコン基板を支持する第2のシリコン基板とが積層される構造の半導体装置であって、
当該半導体装置は、
面方位が(100)または(110)の第1の面と、該第1の面の反対側の第2の面とを有する前記第1のシリコン基板と、第3の面と、該第3の面の反対側の面方位が(111)の第4の面とを有する前記第2のシリコン基板とにおける前記第2の面と前記第3の面とを対向させて接合した後に、前記第1の面から前記第2の面に向けて予め定めた厚さのシリコンをエッチングして、前記第1のシリコン基板を薄化した、
ことを特徴とする半導体装置。 - 前記第1のシリコン基板の前記第2の面側に形成され、入射する光に応じた電荷信号を発生する光電変換部を備えた画素を2次元の行列状に複数配置した画素部、
を備えることを特徴とする請求項1に記載の半導体装置。 - 前記第2のシリコン基板の前記第3の面側に形成され、前記画素部内のそれぞれの前記画素に備えた前記光電変換部が発生した前記電荷信号に基づいた画素信号に対して、予め定めた処理を行うための回路要素を備えた処理回路、
を備えることを特徴とする請求項2に記載の半導体装置。 - 前記第1のシリコン基板の前記第2の面側と、前記第2のシリコン基板の前記第3の面側とのそれぞれに形成され、前記画素部内の回路要素と前記処理回路内の対応する回路要素とを接続する接続部、
を備え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1のシリコン基板の前記第2の面と、該第2の面に対向する前記第2のシリコン基板の前記第3の面との間に配置され、前記第1のシリコン基板の前記第2の面と前記第2のシリコン基板の前記第3の面とを接合する接合層を形成する、
ことを特徴とする請求項1から請求項4のいずれか1の項に記載の半導体装置。 - 薄化した第1のシリコン基板と、該第1のシリコン基板を支持する第2のシリコン基板とが積層される構造の半導体装置の製造方法であって、
当該半導体装置の製造方法は、
面方位が(100)または(110)の第1の面と、該第1の面の反対側の第2の面とを有する前記第1のシリコン基板と、第3の面と、該第3の面の反対側の面方位が(111)の第4の面とを有する前記第2のシリコン基板とにおける前記第2の面と前記第3の面とを対向させて接合する第1の工程と、
前記第1の面と前記第4の面とがエッチング液に晒されるように、前記第1の工程によって前記第1のシリコン基板と前記第2のシリコン基板とを接合した状態で、前記エッチング液に浸漬する第2の工程と、
を含むことを特徴とする半導体装置の製造方法。 - 少なくとも前記第2の工程の前に、前記第2のシリコン基板の少なくとも前記第4の面に酸化膜を形成する第3の工程、
を含むことを特徴とする請求項6に半導体装置の製造方法。 - 前記エッチング液は、
水酸化テトラメチルアンモニウム溶液である、
ことを特徴とする請求項6または請求項7に記載の半導体装置の製造方法。 - 前記第1の工程の前に、前記第1のシリコン基板の前記第2の面側に、入射する光に応じた電荷信号を発生する光電変換部を備えた画素を2次元の行列状に複数配置した画素部を形成する第4の工程、
を含むことを特徴とする請求項6から請求項8のいずれか1の項に記載の半導体装置の製造方法。 - 前記第1の工程の前に、前記第2のシリコン基板の前記第3の面側に、前記画素部内のそれぞれの前記画素に備えた前記光電変換部が発生した前記電荷信号に基づいた画素信号に対して、予め定めた処理を行うための回路要素を備えた処理回路を形成する第5の工程、
を含むことを特徴とする請求項9に半導体装置の製造方法。 - 前記第4の工程および前記第5の工程の後で、前記第1の工程の前に、前記第1のシリコン基板の前記第2の面側と、前記第2のシリコン基板の前記第3の面側とのそれぞれに、前記画素部内の回路要素と前記処理回路内の対応する回路要素とを接続する接続部を形成する第6の工程、
を含むことを特徴とする請求項10に半導体装置の製造方法。
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