JP6881027B2 - 半導体受光素子、及び半導体受光素子の製造方法 - Google Patents
半導体受光素子、及び半導体受光素子の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 229
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 239000000758 substrate Substances 0.000 claims description 71
- 150000001875 compounds Chemical class 0.000 claims description 43
- 230000031700 light absorption Effects 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 29
- 239000000945 filler Substances 0.000 claims description 16
- 238000005530 etching Methods 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 description 25
- 239000002184 metal Substances 0.000 description 25
- 229910005542 GaSb Inorganic materials 0.000 description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 14
- 229910052710 silicon Inorganic materials 0.000 description 14
- 239000010703 silicon Substances 0.000 description 14
- 229910000673 Indium arsenide Inorganic materials 0.000 description 13
- 238000010586 diagram Methods 0.000 description 13
- RPQDHPTXJYYUPQ-UHFFFAOYSA-N indium arsenide Chemical compound [In]#[As] RPQDHPTXJYYUPQ-UHFFFAOYSA-N 0.000 description 13
- 230000004048 modification Effects 0.000 description 11
- 238000012986 modification Methods 0.000 description 11
- 230000004888 barrier function Effects 0.000 description 9
- 239000002019 doping agent Substances 0.000 description 7
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 description 7
- 238000005498 polishing Methods 0.000 description 7
- 238000002161 passivation Methods 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000001039 wet etching Methods 0.000 description 3
- 229910017115 AlSb Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 150000003377 silicon compounds Chemical class 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000001451 molecular beam epitaxy Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000001947 vapour-phase growth Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Description
最初に、本発明の実施形態の内容を列記して説明する。一実施形態に係る半導体受光素子は、アレイ状に配列された複数のフォトダイオードを含む半導体受光素子であって、複数のフォトダイオードそれぞれは、互いに分離している複数の半導体積層それぞれを有し、各半導体積層は、第1導電型のIII−V族化合物半導体を含むタイプIIの超格子構造を有する第1半導体層と、第2導電型のIII−V族化合物半導体を含む第2半導体層と、第1半導体層と第2半導体層との間に設けられ、III−V族化合物半導体を含み赤外光に感応する光吸収層と、を有し、各フォトダイオードは、第1半導体層に接触する第1電極と、第2半導体層に接触する第2電極とを更に有する。
本発明の実施形態に係る半導体受光素子、及び半導体受光素子の製造方法の具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。以下の説明では、図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。
図12は、上記実施形態の一変形例に係る赤外光受光装置1Bの構成を拡大して示す断面図である。図12に示されるように、本変形例の赤外光受光装置1Bは、上記実施形態の複数のカソード電極22に代えて、複数のカソード電極27を備えている。複数のカソード電極27は、複数のフォトダイオード2のn型コンタクト層14の直下にそれぞれ配置されている。各カソード電極27は、各n型コンタクト層14の光吸収層16側とは反対側の面(すなわち裏面)の一部と接触している。具体的には、カソード電極27の平面形状(Z方向から見た形状)は四角形の枠状であり、カソード電極27はn型コンタクト層14の裏面の外周部分上に設けられている。カソード電極27は枠の内側に開口27aを有しており、開口27aからn型コンタクト層14の裏面が露出している。赤外光受光装置1Bの裏面側から入射した赤外光Lは、開口27aを通過して半導体積層11に入射する。なお、カソード電極27の構成材料は上記実施形態のカソード電極22と同じである。また、赤外光受光装置1Bを製造する際には、凹部14a(図8(a)参照)を形成することなく、カソード電極27をn型コンタクト層14の裏面上に形成する。
Claims (8)
- アレイ状に配列された複数のフォトダイオードを含む半導体受光素子であって、
前記複数のフォトダイオードそれぞれは、互いに分離している複数の半導体積層それぞれを有し、
各半導体積層は、
第1導電型のIII−V族化合物半導体を含むタイプIIの超格子構造を有する第1半導体層と、
第2導電型のIII−V族化合物半導体を含む第2半導体層と、
前記第1半導体層と前記第2半導体層との間に設けられ、III−V族化合物半導体を含み赤外光に感応する光吸収層と、を有し、
各フォトダイオードは、前記第1半導体層の側面に接触する第1電極と、前記第2半導体層に接触する第2電極とを更に有する、半導体受光素子。 - 複数の前記第1電極に固着され赤外光を透過する支持基板を更に備える、請求項1に記載の半導体受光素子。
- 前記支持基板はSi基板またはInP基板である、請求項2に記載の半導体受光素子。
- 前記支持基板と前記第1半導体層との隙間が赤外光透過性の充填材によって埋められている、請求項2または3に記載の半導体受光素子。
- 前記半導体積層の積層方向における前記第1電極と前記第1半導体層との接触長さが0.1μm以上0.2μm以下である、請求項1から請求項4のいずれか1項に記載の半導体受光素子。
- 前記第1半導体層の厚さが300nm以上500nm以下である、請求項1から請求項5のいずれか1項に記載の半導体受光素子。
- 前記第1半導体層の前記超格子構造は、Asを含む第1層と、Sbを含み前記第1層とは組成が異なる第2層とを有する、請求項1から請求項6のいずれか1項に記載の半導体受光素子。
- アレイ状に配列された複数のフォトダイオードを含む半導体受光素子を製造する方法であって、
III−V族化合物半導体領域上に、第1導電型のIII−V族化合物半導体を含むタイプIIの超格子構造を有する第1半導体層、III−V族化合物半導体を含み赤外光に感応する光吸収層、及び第2導電型のIII−V族化合物半導体を含む第2半導体層を順に成長する工程と、
前記第2半導体層上に仮基板を貼り付ける工程と、
前記III−V族化合物半導体領域を除去して前記第1半導体層を露出させる工程と、
前記第1半導体層の側面に接触する複数の第1電極を形成する工程と、
前記複数の第1電極に支持基板を固着する工程と、
前記仮基板を除去し、前記第2半導体層、前記光吸収層、及び前記第1半導体層をエッチングすることにより、互いに分離した複数の半導体積層を形成する工程と、
前記複数の半導体積層の前記第2半導体層にそれぞれ接触する複数の第2電極を形成する工程と、
を含む、半導体受光素子の製造方法。
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