JPWO2021019744A1 - 受光素子ユニット - Google Patents
受光素子ユニット Download PDFInfo
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- JPWO2021019744A1 JPWO2021019744A1 JP2019553585A JP2019553585A JPWO2021019744A1 JP WO2021019744 A1 JPWO2021019744 A1 JP WO2021019744A1 JP 2019553585 A JP2019553585 A JP 2019553585A JP 2019553585 A JP2019553585 A JP 2019553585A JP WO2021019744 A1 JPWO2021019744 A1 JP WO2021019744A1
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- 239000000758 substrate Substances 0.000 claims abstract description 145
- 239000004065 semiconductor Substances 0.000 claims abstract description 29
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 claims description 25
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- 239000010410 layer Substances 0.000 description 25
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 17
- 229910052737 gold Inorganic materials 0.000 description 14
- 239000010931 gold Substances 0.000 description 14
- 238000005530 etching Methods 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 9
- 229910052581 Si3N4 Inorganic materials 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 239000007772 electrode material Substances 0.000 description 5
- 229910052814 silicon oxide Inorganic materials 0.000 description 5
- 229910002601 GaN Inorganic materials 0.000 description 3
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
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- 239000013307 optical fiber Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
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Abstract
Description
上記構成によれば、受光素子ユニットは、波長が異なる入射光を分光せずに受光することができるので、受光素子ユニットの小型化を図ることができる。
上記構成によれば、第1の受光素子の入射光の入口側における反射を抑えて第1,第2の受光素子の受光量を確保すると共に、第1の受光素子を透過する入射光の出口側における光の反射を抑えて第2の受光素子の受光量を確保することができる。
上記構成によれば、第1の受光素子の凹部に第2の受光素子を収容して受光素子ユニットの小型化を図ることができると共に、第2の受光素子が支持基板に固定されると同時に電気的に接続されるので、受光素子ユニットの形成を容易にすることができる。
上記構成によれば、第1の受光素子の凹部に第2の受光素子を収容して受光素子ユニットの小型化を図ることができると共に、第2の受光素子が第1の受光素子に固定されると同時に対応する中間配線に電気的に接続され、この第1の受光素子が支持基板に固定されると同時に中間配線が支持基板の対応する配線に接続されるので、受光素子ユニットの形成を容易にすることができる。
上記構成によれば、第2の受光素子の凹部に第1の受光素子を収容して受光素子ユニットを小型化することができる。
上記構成によれば、入射光を分光せずに第1の受光素子で主として可視光領域の入射光を受光し、且つ第2の受光素子で第1の受光素子を透過した赤外光領域の入射光を受光することができるので、受光素子ユニットの小型化を図ることができる。
第1の受光素子10は、第1半導体基板として例えばシリコン基板(以下、Si基板と略す)11の主面側に第1受光領域12を有し、主として可視光領域の入射光を受光するフォトダイオードである。Si基板11は例えばn型であり、このn型のSi基板11の入射光の入口側になる主面側に例えばホウ素がドープされたp型拡散領域12aが形成され、この主面が所定の厚さの反射防止層13(例えば厚さが160nmのシリコン窒化膜やシリコン酸化膜等)に覆われている。尚、反射防止層13の材質や厚さは、適宜設定される。
第2の受光素子20は、第2半導体基板として例えばリン化インジウム基板(以下、InP基板と略す)21の主面側に第2受光領域22を有し、第1の受光素子10の第1受光領域12を透過した赤外光領域の入射光を受光するフォトダイオードである。この第2の受光素子20は、その縦及び横の幅が第1の受光素子10の凹部16の縦及び横の幅よりも小さく、且つその厚さが凹部16の深さよりも小さく形成され、凹部16に第2の受光素子20が収容される。例えば第2の受光素子20は1辺が1mm程度の矩形に形成され、薄化されて厚さが150μm程度に形成されている。
支持基板2は例えばセラミック基板やプリント基板であり、第1,第2の受光素子10,20の電極が固定される部分が露出した複数の配線3a〜3cが形成されている。これら複数の配線3a〜3cは、第1,第2の受光素子10,20の第1,第2アノード電極14,24と第1,第2カソード電極15,25に外部から電気的に容易に接続できるように形成され、外部との接続のためにパッド部4a〜4cを備えている。
第1の受光素子110は、第1半導体基板として例えばSi基板111の主面側に第1受光領域112を有し、主として可視光領域の入射光を受光するフォトダイオードである。Si基板111は例えばn型であり、このn型のSi基板111の入射光の入口側になる主面側に、例えばホウ素がドープされたp型拡散領域112aが形成されている。
第2の受光素子120は、第2半導体基板として例えばInP基板121の主面側に第2受光領域122を有し、第1の受光素子110の第1受光領域112を透過した赤外光領域の入射光を受光するフォトダイオードである。この第2の受光素子120は、あまり又は全く薄化されずにその厚さが第1の受光素子110の厚さよりも大きく形成されている。そして、第1,第2の受光素子110,120を重ねたときの厚さを抑えるために、第1の受光素子110を収容するための凹部126を有し、第2の受光素子120の縦及び横の幅が第1の受光素子110の縦及び横の幅よりも大きくなっている。例えば第2の受光素子20は1辺が3mm程度の矩形に形成され、厚さが250〜400μm程度に形成されている。
支持基板102は例えばセラミック基板やプリント基板であり、第1,第2の受光素子110,120が電気的に接続される部分が露出した複数の配線103a〜103cが形成されている。これら複数の配線103a〜103cは、第1,第2の受光素子110,120の第1,第2アノード電極114,124と第1,第2カソード電極115,125に外部から電気的に容易に接続できるように、外部との接続のためにパッド部104a〜104cを備えている。
受光素子ユニット1は、第1の受光素子10と第2の受光素子20を備え、第1の受光素子10の第1半導体基板に、第1受光領域12と反対側の裏面から主面側の第1受光領域12に向かって凹状に形成された凹部16を有する。一方、受光素子ユニット101は、第1の受光素子110と第2の受光素子120を備え、第2の受光素子120の第2半導体基板に、第2受光領域122と反対側の裏面から主面側の第2受光領域122に向かって凹状に形成された凹部126を有する。そして、凹部16には第2の受光素子20が収容され、凹部126には第1の受光素子110が収容されている。換言すると、第1の受光素子と第2の受光素子のうちの一方が凹部を有し、他方がその凹部に収容されている。
2,102 :支持基板
3a〜3c,103a〜103c :配線
4a〜4c,104a〜104c :パッド
5,105〜108 :金ワイヤ(導電性ワイヤ)
10,110 :第1の受光素子
11,111 :Si基板(第1半導体基板)
12,112 :第1受光領域
12a,112a :p型拡散領域
13,18,113,118 :反射防止層
14,114 :第1アノード電極
15,115 :第1カソード電極
16 :凹部
17,27,127 :導電性接着剤
20,120 :第2の受光素子
21,121 :InP基板(第2半導体基板)
22,122 :第2受光領域
22a,122a :p型領域
23,28,123,128 :反射防止層
24,124 :第2アノード電極
25,125 :第2カソード電極
31,32,131,132 :中間配線
117 :接着剤
126 :凹部
Claims (7)
- 第1半導体基板の主面側に受光領域を有する第1の受光素子と、第2半導体基板の主面側に受光領域を有する第2の受光素子と、前記第1の受光素子と前記第2の受光素子を外部に電気的に接続するための配線を有する支持基板を備えた受光素子ユニットにおいて、
前記第1の受光素子と前記第2の受光素子のうち、一方は前記受光領域と反対側の裏面から前記受光領域側に向かって凹状に形成された凹部を有し、他方は前記凹部に収容されたことを特徴とする受光素子ユニット。 - 前記第1の受光素子と前記第2の受光素子は、前記第1の受光素子の受光領域を透過した光が前記第2の受光素子の受光領域に入射するように配置されたことを特徴とする請求項1に記載の受光素子ユニット。
- 前記第1の受光素子は、入射光の入口側及び出口側に反射防止層を夫々有することを特徴とする請求項1又は2に記載の受光素子ユニット。
- 前記第1の受光素子は、前記凹部を有し、この凹部側が前記支持基板に固定され、
前記第2の受光素子は、前記第2半導体基板の主面側に電極を有し、前記電極が固化させた導電性部材によって前記支持基板の対応する前記配線に固定されたことを特徴とする請求項1〜3の何れか1項に記載の受光素子ユニット。 - 前記第1の受光素子は、前記凹部と、この凹部側に前記支持基板の対応する配線に接続される中間配線を有して、前記凹部側が前記支持基板に固定され、
前記第2の受光素子は、前記第2半導体基板の主面側に電極を有し、前記電極が固化させた導電性部材によって前記第1の受光素子の対応する前記中間配線に固定されたことを特徴とする請求項1〜3の何れか1項に記載の受光素子ユニット。 - 前記第2の受光素子は、前記凹部と、この凹部側に前記支持基板の対応する配線に導電性ワイヤによって接続される中間配線を有して、前記凹部と反対側が前記支持基板に固定され、
前記第1の受光素子は、前記第1半導体基板の主面側に電極を有し、前記電極と反対側が前記凹部に固定された状態で、前記電極が導電性ワイヤによって前記中間配線に夫々接続されたことを特徴とする請求項1〜3の何れか1項に記載の受光素子ユニット。 - 前記第1半導体基板はシリコン基板であり、前記第2半導体基板はリン化インジウム基板であることを特徴とする請求項1〜6の何れか1項に記載の受光素子ユニット。
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