JP2016149387A - 撮像装置およびその製造方法 - Google Patents
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Abstract
Description
他の実施の形態に係る撮像装置の製造方法によれば、光電変換部の暗電流が抑制される撮像装置を製造することができる。
(絶縁分離)
まず、フォトダイオード領域とグランド領域とが、分離絶縁膜によって絶縁分離された撮像装置の第1例について説明する。
まず、一般的な方法によって、絶縁膜による分離領域が形成される。半導体基板の表面を覆うように形成されたシリコン窒化膜に、所定の写真製版処理およびエッチング処理を行うことにより、トレンチを形成するためのマスクが形成される。次に、図4に示すように、シリコン窒化膜SSNをエッチングマスクとして、半導体基板SUBにエッチング処理を行うことにより、トレンチTCが形成される。
次に、フォトダイオード領域とグランド領域とが、pn接合によってpn分離された撮像装置の第1例について説明する。
(絶縁分離)
ここでは、フォトダイオード領域とグランド領域とが、分離絶縁膜によって絶縁分離された撮像装置の第2例について説明する。
ここでは、フォトダイオード領域とグランド領域とが、pn接合によってpn分離された撮像装置の第2例について説明する。
(絶縁分離)
ここでは、フォトダイオード領域とグランド領域とが、分離絶縁膜によって絶縁分離された撮像装置の第3例について説明する。
ここでは、フォトダイオード領域とグランド領域とが、分離絶縁膜によって絶縁分離された撮像装置の第4例について説明する。
ここでは、フォトダイオード領域とグランド領域とが、pn接合によって分離された撮像装置の第3例について説明する。
ここでは、フォトダイオード領域とグランド領域とが、pn接合によって分離された撮像装置の第4例について説明する。
Claims (17)
- 主表面を有する半導体基板と、
前記半導体基板に規定され、第1導電型の第1不純物領域によって形成された素子形成領域と、
前記素子形成領域に規定された画素領域と、
前記画素領域に形成された光電変換部と、
前記光電変換部とは分離部を介して前記素子形成領域に規定され、前記光電変換部に電気に接続されるとともに、接地電位に電気的に接続されるグランド領域と、
少なくとも前記光電変換部および前記グランド領域を覆うように形成された、光の反射を抑制する反射防止膜と、
前記反射防止膜を覆うように形成された層間絶縁膜と、
前記層間絶縁膜および前記反射防止膜を貫通するように形成され、前記グランド領域に電気的に接続されるプラグと
を備えた、撮像装置。 - 前記分離部は、絶縁膜による絶縁分離とされ、
前記グランド領域には、前記第1不純物領域の不純物濃度よりも高い不純物濃度を有する第1導電型の第2不純物領域が形成された、請求項1記載の撮像装置。 - 前記分離部は、絶縁膜による絶縁分離とされ、
前記グランド領域に位置する前記第1不純物領域の部分と前記光電変換部との間に、前記第1不純物領域の不純物濃度よりも高い不純物濃度を有する第1導電型の第3不純物濃度領域が形成された、請求項1記載の撮像装置。 - 前記分離部は、絶縁膜による絶縁分離とされ、
前記画素領域における、前記光電変換部の側方に規定された画素トランジスタ領域を備え、
前記グランド領域は、前記画素トランジスタ領域に対して、前記光電変換部から離れる方向に配置された、請求項1記載の撮像装置。 - 前記分離部は、絶縁膜による絶縁分離とされ、
前記光電変換部は、前記プラグが接触する前記グランド領域のコンタクト部から遠ざかるように後退する部分を含む、請求項1記載の撮像装置。 - 前記プラグと前記グランド領域とのコンタクト部に、第1導電型の不純物が注入されたコンタクト注入部が形成された、請求項1〜5のいずれかに記載の撮像装置。
- 前記プラグと前記グランド領域とのコンタクト部に、金属シリサイドが形成された、請求項1〜5のいずれかに記載の撮像装置。
- 前記分離部はpn接合による接合分離とされ、
前記グランド領域には、前記第1不純物領域の不純物濃度よりも高い不純物濃度を有する第1導電型の第5不純物領域が形成され、
前記光電変換部は、第2導電型の光電変換不純物領域を含み、
前記pn接合は、第1導電型の前記第5不純物領域と第2導電型の前記光電変換不純物領域との接合部分を含む、請求項1記載の撮像装置。 - 前記分離部はpn接合による接合分離とされ、
前記グランド領域と前記光電変換部との間に、前記第1不純物領域の不純物濃度よりも高い不純物濃度を有する第1導電型の第6不純物領域を備え、
前記光電変換部は第2導電型の光電変換不純物領域を含み、
前記pn接合は、第1導電型の前記第6不純物領域と第2導電型の前記光電変換不純物領域との接合部分を含む、請求項1記載の撮像装置。 - 前記分離部はpn接合による接合分離とされ、
前記光電変換部は、前記プラグが接触する前記グランド領域のコンタクト部から遠ざかるように後退する部分を含む、請求項1記載の撮像装置。 - 前記プラグと前記グランド領域とのコンタクト部に、第1導電型の不純物が注入されたコンタクト注入部が形成された、請求項1、8〜10のいずれかに記載の撮像装置。
- 前記プラグと前記グランド領域とのコンタクト部に、金属シリサイドが形成された、請求項1、8〜10のいずれかに記載の撮像装置。
- 半導体基板に、画素領域およびグランド領域を含む第1導電型の素子形成領域を規定する工程と、
前記画素領域に光電変換部を形成する工程と、
少なくとも前記光電変換部および前記グランド領域を覆うように、光の反射を抑止する反射防止膜を形成する工程と、
前記反射防止膜を覆うように、層間絶縁膜を形成する工程と、
前記層間絶縁膜および前記反射防止膜を貫通して前記グランド領域に接触し、前記グランド領域を接地電位に電気的に接続するプラグを形成する工程と
を備えた、撮像装置の製造方法。 - 前記素子形成領域を規定する工程は、前記光電変換部が形成される領域と前記グランド領域とを分離絶縁膜によって規定する工程を含み、
前記グランド領域と前記光電変換部とは、前記分離絶縁膜による絶縁分離とされた、請求項13記載の撮像装置の製造方法。 - 前記光電変換部を形成する工程は、第2導電型の光電変換不純物領域を形成する工程を含み、
前記グランド領域と前記光電変換部とは、前記グランド領域に位置する第1導電型の前記素子形成領域の部分と、第2導電型の前記光電変換不純物領域との接合による接合分離とされた、請求項13記載の撮像装置の製造方法。 - 前記プラグと前記グランド領域とのコンタクト部に、不純物を注入することによりコンタクト注入部を形成する工程を備えた、請求項13〜15のいずれかに記載の撮像装置の製造方法。
- 前記プラグと前記グランド領域とのコンタクト部に、金属シリサイドを形成する工程を備えた、請求項13〜15のいずれかに記載の撮像装置の製造方法。
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KR1020160010868A KR20160098040A (ko) | 2015-02-10 | 2016-01-28 | 촬상 장치 및 그 제조 방법 |
TW105103078A TW201640662A (zh) | 2015-02-10 | 2016-02-01 | 攝影裝置及其製造方法 |
CN201610082713.6A CN105870140A (zh) | 2015-02-10 | 2016-02-05 | 摄像装置以及摄像装置的制造方法 |
US15/019,089 US9647023B2 (en) | 2015-02-10 | 2016-02-09 | Image pickup device and method of manufacturing the same |
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US9647023B2 (en) | 2017-05-09 |
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