JP5956968B2 - 受光素子および光結合型信号絶縁装置 - Google Patents
受光素子および光結合型信号絶縁装置 Download PDFInfo
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- 229910052751 metal Inorganic materials 0.000 claims description 64
- 239000002184 metal Substances 0.000 claims description 64
- 239000004065 semiconductor Substances 0.000 claims description 28
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 19
- 150000004767 nitrides Chemical class 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 5
- 229910052715 tantalum Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims 1
- 229910052758 niobium Inorganic materials 0.000 claims 1
- 239000010408 film Substances 0.000 description 61
- 239000010409 thin film Substances 0.000 description 19
- 230000004888 barrier function Effects 0.000 description 13
- 229920002120 photoresistant polymer Polymers 0.000 description 11
- 239000000758 substrate Substances 0.000 description 10
- 238000002834 transmittance Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000001020 plasma etching Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910004205 SiNX Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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- Electromagnetism (AREA)
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Description
この場合、入力回路と出力回路とを絶縁した状態で電気信号を伝送できる光結合型絶縁装置を用いると、安定に動作させると共に、安全性が確保できる。
ITO(Indium Tin Oxide)やメッシュ状金属薄膜などからなる電磁シールド膜により受光素子を覆うと、これらのノイズを低減することができる。ただし、受光素子の製造プロセスにおいて、このような電磁シールド膜の量産性を高めることは困難である。
図1は、第1の実施形態にかかる受光素子の模式平面図である。
半導体層は、信号光が入射し電気信号に変換する受光部20を有する。受光部20を構成するフォトダイオードの1ユニットの一辺の長さは、20〜200μmなどとでき、このユニットをアレイ形状、またはモザイクアレイ形状に配置することができる。
半導体基板70は、たとえば、SiやSiCなどとすることができる。また、Siなどを含む半導体層72は、半導体基板70の上に設けられ、信号光Linが入射し電気信号に変換する受光部20と、電気信号を処理して出力する信号処理回路部と、を有する。たとえば、半導体基板70をp+形とし、その上にn形層を設ける。受光部20と信号処理回路部とを分離するために、たとえば、p+形層72aを表面側から半導体基板70に到達するようにイオン注入法などにより形成する。
光結合型絶縁装置(フォトカプラおよびフォトリレーを含む)80は、第1の実施形態の受光素子10と、受光素子10と電気的に絶縁され受光部20へ近赤外光を照射する発光素子84と、を有している。もし、受光素子10が信号出力部、すなわち出力リード83の上に設けられ、発光素子84が信号入力部、すなわち入力リード82の上に設けられた場合、互いに対向する発光素子84と受光素子10とを包むインナ樹脂層86とアウタ樹脂層87とをさらに設けることができる。なお、絶縁基板上に、受光素子と、発光素子と、をそれぞれ設け、樹脂層で封止してもよい。
光結合型絶縁装置80は、入力リード82(発光素子84の側)と出力リード83(受光素子10の側)とが絶縁されている。このため、入力リード82と出力リード83との間に、浮遊容量を有する。入出力リード間に、急激に変化するパルス電圧VCMを加えると、変位電流が流れ、受光素子10の出力電圧Voに誤動作の原因となるノイズを発生する。瞬時同相除去電圧は、コモンモードノイズ耐性(CMR:Common Mode Rejection)で表すことができる。すなわち、高いCMRは、ノイズ耐性が高いことを意味する。
TiN薄膜などからなる電磁シールド膜24は、金属配線層50dを介して光結合型絶縁装置の出力リード(接地側)83aに接続される。また、受光部20の一方の端子と信号処理回路部30の接地端子とが、出力リード83aに接続される。また、たとえば、図5において、受光素子10のフロントエンドに設けられるTIAアンプ32の入力端子は、受光部20の他方の端子と接続される。
TiNなどの電磁シールド膜24は、複数の層からなる金属配線層50のうち最上層の上面と接して接続される。このため、金属配線層50dと、電磁シールド膜24と、の間に、絶縁層60の内部に導通ホールを設ける必要が無く、かつ浮遊容量Cnsを低減できる。なお、受光素子10はp形基板に限定されず、n形基板であってもよい。また、金属配線層50は、Al、Cu、Tiなどの金属とすることができる。
Claims (8)
- カソードを含む受光部を有する半導体層と、
前記半導体層の上に設けられた絶縁層と、
前記絶縁層内に設けられ接地された配線層と、
一部が前記配線層と重なるように前記配線層と前記カソードとの間の前記絶縁層内に設けられ、前記配線層と接続されるとともに前記受光部を覆う膜であって、金属あるいはTi、Ta、Zr、V、およびNbのうちの少なくともいずれかを含む窒化金属である膜と、
を備えた受光素子。 - 前記受光部は、アノードをさらに含み、
前記膜は、前記配線層を介して、前記アノードまたは前記カソードに接続された請求項1記載の受光素子。 - 前記半導体層は、前記受光部に接続され、前記電気信号を処理して出力する信号処理回路部をさらに有し、
前記膜は、前記配線層を介して前記信号処理回路部の接地に接続された請求項1記載の受光素子。 - 前記配線層は、前記絶縁膜を間に挟んで設けられる複数の配線層のうち、前記半導体層から最も離れた位置に設けられた請求項1記載の受光素子。
- 前記膜は、前記配線層の上面の少なくとも一部に接して設けられていることを特徴とする請求項1に記載の受光素子。
- 前記金属は、Ti、Ta、W、Co、Ni、Al、Cuのいずれかを含む請求項1〜5のいずれか1つに記載の受光素子。
- 前記膜は、TiNからなり、21nm以下の厚さを有する請求項1〜6のいずれか1つに記載の受光素子。
- 請求項1〜7のいずれか1つに記載の受光素子と、
前記受光部へ前記信号光を照射する発光素子と、
前記発光素子が設けられた信号入力部と、
前記受光素子が設けられ、前記信号入力部と絶縁された出力部と、
を備えた光結合型絶縁装置。
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JP2013190503A JP5956968B2 (ja) | 2013-09-13 | 2013-09-13 | 受光素子および光結合型信号絶縁装置 |
US14/203,114 US9379272B2 (en) | 2013-09-13 | 2014-03-10 | Light receiving element and optically coupled insulating device |
US14/852,084 US20150380594A1 (en) | 2013-09-13 | 2015-09-11 | Shielding film for a light receiving element and optically coupled insulating device |
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TW201637190A (zh) | 2015-03-25 | 2016-10-16 | Sony Corp | 固體攝像裝置及電子機器 |
WO2018020902A1 (ja) * | 2016-07-27 | 2018-02-01 | ソニーセミコンダクタソリューションズ株式会社 | 固体撮像素子、および電子機器 |
JP2020113602A (ja) * | 2019-01-09 | 2020-07-27 | 株式会社東芝 | 半導体装置 |
JPWO2022264982A1 (ja) * | 2021-06-14 | 2022-12-22 | ||
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JPH0350777A (ja) * | 1989-07-18 | 1991-03-05 | Nec Corp | ホトカプラ |
JPH0369173A (ja) * | 1989-08-08 | 1991-03-25 | Nec Corp | ホトカプラ |
JP3074685B2 (ja) * | 1989-09-26 | 2000-08-07 | 日本電気株式会社 | 受光ic |
JPH03180077A (ja) * | 1989-12-08 | 1991-08-06 | Nec Corp | ホトカプラ |
JP3362712B2 (ja) * | 1990-08-21 | 2003-01-07 | セイコーエプソン株式会社 | 半導体装置、それを用いた半導体メモリ及びcmos半導体集積回路並びにその半導体装置の製造方法 |
JPH04106985A (ja) | 1990-08-27 | 1992-04-08 | Nec Corp | ホトカプラ |
JP2651756B2 (ja) | 1991-04-24 | 1997-09-10 | シャープ株式会社 | 光半導体装置 |
JPH04354379A (ja) * | 1991-05-31 | 1992-12-08 | Nec Corp | フォトカプラ |
JPH04373181A (ja) * | 1991-06-21 | 1992-12-25 | Nec Corp | フォトカプラ |
JPH0556916A (ja) * | 1991-08-30 | 1993-03-09 | Toshiba Corp | 内視鏡用固体撮像素子モジユール |
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2013
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US9379272B2 (en) | 2016-06-28 |
US20150076526A1 (en) | 2015-03-19 |
US20150380594A1 (en) | 2015-12-31 |
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