JP7175159B2 - 撮像素子および製造方法、並びに電子機器 - Google Patents
撮像素子および製造方法、並びに電子機器 Download PDFInfo
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- 238000003384 imaging method Methods 0.000 title claims description 128
- 238000004519 manufacturing process Methods 0.000 title claims description 41
- 239000000758 substrate Substances 0.000 claims description 99
- 239000004065 semiconductor Substances 0.000 claims description 98
- 239000000463 material Substances 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 239000013078 crystal Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000031700 light absorption Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 description 102
- 238000005530 etching Methods 0.000 description 32
- 229910052581 Si3N4 Inorganic materials 0.000 description 31
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 23
- 229910052814 silicon oxide Inorganic materials 0.000 description 23
- 238000003860 storage Methods 0.000 description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 15
- 229910052710 silicon Inorganic materials 0.000 description 15
- 239000010703 silicon Substances 0.000 description 15
- 239000000203 mixture Substances 0.000 description 13
- 230000006870 function Effects 0.000 description 12
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 9
- 229910052721 tungsten Inorganic materials 0.000 description 9
- 239000010937 tungsten Substances 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000000926 separation method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 6
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- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000003796 beauty Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000002583 angiography Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001312 dry etching Methods 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
- 239000010931 gold Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Description
図1を参照して、本技術を適用した撮像素子が備える素子分離部の基本的な構成例について説明する。
図2を参照して、突起部33を有する素子分離部31の平面的な配置について説明する。
図3乃至図14を参照して、突起部33を有する素子分離部31を備えた撮像素子の構成例について説明する。
図15乃至図23を参照して、本技術を適用した撮像素子の製造方法における素子分離部31または素子分離部21を形成するプロセスについて説明する。
上述したような撮像素子51は、例えば、デジタルスチルカメラやデジタルビデオカメラなどの撮像システム、撮像機能を備えた携帯電話機、または、撮像機能を備えた他の機器といった各種の電子機器に適用することができる。
図25は、上述のイメージセンサ(撮像素子)を使用する使用例を示す図である。
・自動停止等の安全運転や、運転者の状態の認識等のために、自動車の前方や後方、周囲、車内等を撮影する車載用センサ、走行車両や道路を監視する監視カメラ、車両間等の測距を行う測距センサ等の、交通の用に供される装置
・ユーザのジェスチャを撮影して、そのジェスチャに従った機器操作を行うために、TVや、冷蔵庫、エアーコンディショナ等の家電に供される装置
・内視鏡や、赤外光の受光による血管撮影を行う装置等の、医療やヘルスケアの用に供される装置
・防犯用途の監視カメラや、人物認証用途のカメラ等の、セキュリティの用に供される装置
・肌を撮影する肌測定器や、頭皮を撮影するマイクロスコープ等の、美容の用に供される装置
・スポーツ用途等向けのアクションカメラやウェアラブルカメラ等の、スポーツの用に供される装置
・畑や作物の状態を監視するためのカメラ等の、農業の用に供される装置
なお、本技術は以下のような構成も取ることができる。
(1)
照射される光を光電変換する光電変換部が形成される半導体基板と、
前記半導体基板の受光面側から、複数の前記光電変換部どうしの間に設けられたトレンチ部と、
前記トレンチ部の一部分において、前記トレンチ部の間隔が広がるように前記トレンチ部の側面に対して傾斜する傾斜面を少なくとも設けた突起部と
を備える撮像素子。
(2)
前記突起部は、前記半導体基板を構成する結晶の所定の面方位に沿った前記傾斜面により構成される
上記(1)に記載の撮像素子。
(3)
前記突起部は、前記トレンチ部の先端に設けられる
上記(1)または(2)に記載の撮像素子。
(4)
前記突起部は、前記半導体基板の受光面から前記トレンチ部の先端までの間の中段に設けられる
上記(1)から(3)までのいずれかに記載の撮像素子。
(5)
前記突起部は、前記半導体基板の受光面から前記トレンチ部の先端までの間の複数個所に設けられる
上記(1)から(4)までのいずれかに記載の撮像素子。
(6)
前記トレンチ部および前記突起部には、光の透過を抑制する材料が埋め込まれる
上記(1)から(5)までのいずれかに記載の撮像素子。
(7)
前記突起部のうちの前記トレンチ部の側面よりも側面方向に突出している突出部に埋め込まれる第1の材料と、前記突出部以外の前記トレンチ部の内部に埋め込まれる第2の材料とは、それぞれ特性が異なる
上記(6)に記載の撮像素子。
(8)
前記第1の材料は、前記第2の材料よりも光に対する吸収係数が高く、
前記第2の材料は、前記第1の材料よりも光に対する反射率が高い
上記(7)に記載の撮像素子。
(9)
撮像素子を製造する製造装置が、
照射される光を光電変換する光電変換部が形成される半導体基板の受光面側から、複数の前記光電変換部どうしの間に設けられるトレンチ部を彫り込むことと、
前記トレンチ部の一部分において、前記トレンチ部の間隔が広がるように前記トレンチ部の側面に対して傾斜する傾斜面を少なくとも設けた突起部を形成することと
を含む製造方法。
(10)
照射される光を光電変換する光電変換部が形成される半導体基板と、
前記半導体基板の受光面側から、複数の前記光電変換部どうしの間に設けられたトレンチ部と、
前記トレンチ部の一部分において、前記トレンチ部の間隔が広がるように前記トレンチ部の側面に対して傾斜する傾斜面を少なくとも設けた突起部と
を有する撮像素子を備える電子機器。
(11)
前記突起部は、アルカリ薬液を用いたシリコン面方位選択エッチングによって形成される
上記(9)に記載の製造方法。
Claims (9)
- 照射される光を光電変換する光電変換部が形成される半導体基板と、
前記半導体基板の受光面側から、複数の前記光電変換部どうしの間に設けられたトレンチ部と、
前記トレンチ部の一部分において、前記トレンチ部の間隔が広がるように前記トレンチ部の側面に対して傾斜する傾斜面を少なくとも設けた突起部と
を備え、
前記突起部は、前記半導体基板を構成する結晶の所定の面方位に沿った前記傾斜面により構成される
撮像素子。 - 前記突起部は、前記トレンチ部の先端に設けられる
請求項1に記載の撮像素子。 - 前記突起部は、前記半導体基板の受光面から前記トレンチ部の先端までの間の中段に設けられる
請求項1に記載の撮像素子。 - 前記突起部は、前記半導体基板の受光面から前記トレンチ部の先端までの間の複数個所に設けられる
請求項1に記載の撮像素子。 - 前記トレンチ部および前記突起部には、光の透過を抑制する材料が埋め込まれる
請求項1に記載の撮像素子。 - 前記突起部のうちの前記トレンチ部の側面よりも側面方向に突出している突出部に埋め込まれる第1の材料と、前記突出部以外の前記トレンチ部の内部に埋め込まれる第2の材料とは、それぞれ特性が異なる
請求項5に記載の撮像素子。 - 前記第1の材料は、前記第2の材料よりも光に対する吸収係数が高く、
前記第2の材料は、前記第1の材料よりも光に対する反射率が高い
請求項6に記載の撮像素子。 - 撮像素子を製造する製造装置が、
照射される光を光電変換する光電変換部が形成される半導体基板の受光面側から、複数の前記光電変換部どうしの間に設けられるトレンチ部を彫り込むことと、
前記トレンチ部の一部分において、前記トレンチ部の間隔が広がるように前記トレンチ部の側面に対して傾斜する傾斜面を少なくとも設けた突起部を形成することと
を含み、
前記突起部は、前記半導体基板を構成する結晶の所定の面方位に沿った前記傾斜面により構成される
製造方法。 - 照射される光を光電変換する光電変換部が形成される半導体基板と、
前記半導体基板の受光面側から、複数の前記光電変換部どうしの間に設けられたトレンチ部と、
前記トレンチ部の一部分において、前記トレンチ部の間隔が広がるように前記トレンチ部の側面に対して傾斜する傾斜面を少なくとも設けた突起部と
を有する撮像素子を備え、
前記突起部は、前記半導体基板を構成する結晶の所定の面方位に沿った前記傾斜面により構成される
電子機器。
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