JP6918398B1 - 端面入射型半導体受光素子 - Google Patents
端面入射型半導体受光素子 Download PDFInfo
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- JP6918398B1 JP6918398B1 JP2021519177A JP2021519177A JP6918398B1 JP 6918398 B1 JP6918398 B1 JP 6918398B1 JP 2021519177 A JP2021519177 A JP 2021519177A JP 2021519177 A JP2021519177 A JP 2021519177A JP 6918398 B1 JP6918398 B1 JP 6918398B1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 118
- 230000031700 light absorption Effects 0.000 claims abstract description 83
- 239000000758 substrate Substances 0.000 claims abstract description 53
- 230000035945 sensitivity Effects 0.000 abstract description 38
- 239000002184 metal Substances 0.000 description 21
- 238000009792 diffusion process Methods 0.000 description 17
- 230000003287 optical effect Effects 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 7
- 238000005275 alloying Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 229910052681 coesite Inorganic materials 0.000 description 5
- 229910052906 cristobalite Inorganic materials 0.000 description 5
- 239000007772 electrode material Substances 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 229910052682 stishovite Inorganic materials 0.000 description 5
- 229910052905 tridymite Inorganic materials 0.000 description 5
- 238000005530 etching Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001259 photo etching Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/10—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a light reflecting structure, e.g. semiconductor Bragg reflector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0232—Optical elements or arrangements associated with the device
- H01L31/02327—Optical elements or arrangements associated with the device the optical elements being integrated or being directly associated to the device, e.g. back reflectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022416—Electrodes for devices characterised by at least one potential jump barrier or surface barrier comprising ring electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/0248—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
- H01L31/0352—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions
- H01L31/035272—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions characterised by at least one potential jump barrier or surface barrier
- H01L31/035281—Shape of the body
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- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Light Receiving Elements (AREA)
Abstract
Description
また、第1反射部で反射されて第1光吸収領域を透過した光を、第2反射部によって反射させて第1光吸収領域に入射させることができる。従って、第1、第2反射部によって入射光を第1光吸収領域に通算4回入射させることができるので、端面入射型半導体受光素子の受光感度を向上させることができる。
上記構成によれば、第1反射部で反射されて第1光吸収領域を透過した光を、第2反射部によって反射させて第1光吸収領域に入射させることができる。従って、第1、第2反射部によって入射光を第1光吸収領域に通算4回入射させることができるので、端面入射型半導体受光素子の受光感度を向上させることができる。
上記構成によれば、第1反射部で反射されて第1光吸収領域を透過した光を、第3反射部によって反射させて第2光吸収領域に入射させることができる。従って、第1反射部によって入射光を第1光吸収領域に2回入射させ、第3反射部によって第1光吸収領域を透過した光を第2光吸収領域に入射させることができるので、端面入射型半導体受光素子の受光感度を向上させることができる。
上記構成によれば、第1光吸収領域を縁取るように半導体基板の主面側に形成された環状電極の内側に、誘電体膜と複数の金属膜が積層された第1反射部が形成されている。環状電極の接合面は、合金化によって細かい凹凸が生じるため反射率が低い。しかし、環状電極の内側には、合金化を防いで平滑面を提供する誘電体膜と、高い反射率を提供するための複数の金属膜とが積層された第1反射部が形成されている。従って、第1光吸収領域を透過した光を第1反射部で反射させて第1光吸収領域に入射させることができるので、端面入射型半導体受光素子の受光感度を向上させることができる。
図3に示すように、主面10a側に第1受光部15が形成された半導体基板10を覆う誘電体膜13(例えば200nmの厚さのSiO2膜)を、公知のフォト、エッチング手段によって誘電体膜13を選択的に除去して、環状電極16を形成するための溝13aを形成する(溝形成工程)。溝13aの底部では、p型拡散領域12aを露出させる。
図8に示すように、端面入射型半導体受光素子1Bは、端面10c側の出射点Pから入射する光を溝反射部20で第1受光部15に向けて反射させ、第1受光部15の第1光吸収領域11aを透過した光を第1反射部21で反射させて第1光吸収領域11aに再び入射させる。そして、第1光吸収領域11aを透過した光を、半導体基板10の裏面10b側に形成された第2反射部25によって第1受光部15に向けて反射させる。
図10に示すように、端面入射型半導体受光素子1Dは、端面10c側の出射点Pから入射する光を屈折面10dで第1受光部15に向けて屈折させ、第1受光部15の第1光吸収領域11aを透過した光を第1反射部21で反射させて第1光吸収領域11aに再び入射させる。そして第1光吸収領域11aを透過した光を、半導体基板10の裏面10b側に形成された第2反射部26によって第1受光部15に向けて反射させる。
図12に示すように、端面入射型半導体受光素子1Fは、半導体基板10の主面10a側に第1受光部15及び第1受光部15から離隔して形成された第2受光部30を有し、裏面10bの第1受光部15と第2受光部30の中間の部位に第3反射部31を有する。第2受光部30は、第2光吸収領域11bとp型拡散領域12bを有し、第1受光部15と同じ構造のフォトダイオードである。
端面入射型半導体受光素子1A〜1Fは、半導体基板10の主面10a側に第1光吸収領域11aを有し、端面10c側の出射点Pから入射する光を溝反射部20による反射又は屈折面10dによる屈折によって、第1光吸収領域11aに入射させる。そして、端面入射型半導体受光素子1A〜1Fは主面10a側の第1光吸収領域11a近傍に第1反射部21を有し、第1光吸収領域11aを透過した光が第1反射部21で反射され、第1光吸収領域11aに再び入射される。第1光吸収領域11aの近傍に第1反射部21があるので、反射された光の広がりは僅かである。従って、第1反射部21で反射された光の全てを第1光吸収領域11aに入射させることができるので、端面入射型半導体受光素子1A〜1Fの受光感度を向上させることができる。
10 :半導体基板
10a :主面
10b :裏面
10c :端面
10d :屈折面
10e :端面
10f :平面部
11 :InGaAs層
11a :第1光吸収領域
11b :第2光吸収領域
12 :n−InP層
12a,12b :p型拡散領域
13 :誘電体膜
15 :第1受光部
16 :環状電極
17 :基板電極
18 :溝部
18a :第1傾斜面
18b :第2傾斜面
20 :溝反射部
21 :第1反射部
22 :Cr膜
23 :Ni膜
24 :Au膜
25,26 :第2反射部
30 :第2受光部
31 :第3反射部
32 :環状電極
35 :第4反射部
Claims (1)
- 半導体基板の主面側に第1光吸収領域を有し、前記半導体基板の端面側から入射する光を反射又は屈折によって前記第1光吸収領域に入射させる端面入射型半導体受光素子において、
前記主面側に、前記第1光吸収領域を透過した光を前記第1光吸収領域に入射させるための第1反射部を有すると共に、前記第1反射部によって反射されて前記第1光吸収領域を透過した光を前記第1光吸収領域に向けて最短経路で反射させるための単一の第2反射部を有することを特徴とする端面入射型半導体受光素子。
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PCT/JP2020/021628 WO2021245756A1 (ja) | 2020-06-01 | 2020-06-01 | 端面入射型半導体受光素子 |
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JPWO2021245756A1 JPWO2021245756A1 (ja) | 2021-12-09 |
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US (1) | US20230049438A1 (ja) |
JP (1) | JP6918398B1 (ja) |
WO (1) | WO2021245756A1 (ja) |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004241681A (ja) * | 2003-02-07 | 2004-08-26 | Toshiba Corp | 半導体受光装置及びその製造方法 |
JP2005165254A (ja) * | 2003-11-28 | 2005-06-23 | Korea Electronics Telecommun | 光検出器が集積可能な光結合装置 |
JP2011003638A (ja) * | 2009-06-17 | 2011-01-06 | Opnext Japan Inc | 受光素子 |
JP2011187607A (ja) * | 2010-03-08 | 2011-09-22 | Nippon Telegr & Teleph Corp <Ntt> | 半導体受光素子 |
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2020
- 2020-06-01 WO PCT/JP2020/021628 patent/WO2021245756A1/ja active Application Filing
- 2020-06-01 JP JP2021519177A patent/JP6918398B1/ja active Active
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- 2022-11-03 US US17/979,777 patent/US20230049438A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004241681A (ja) * | 2003-02-07 | 2004-08-26 | Toshiba Corp | 半導体受光装置及びその製造方法 |
JP2005165254A (ja) * | 2003-11-28 | 2005-06-23 | Korea Electronics Telecommun | 光検出器が集積可能な光結合装置 |
JP2011003638A (ja) * | 2009-06-17 | 2011-01-06 | Opnext Japan Inc | 受光素子 |
JP2011187607A (ja) * | 2010-03-08 | 2011-09-22 | Nippon Telegr & Teleph Corp <Ntt> | 半導体受光素子 |
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US20230049438A1 (en) | 2023-02-16 |
JPWO2021245756A1 (ja) | 2021-12-09 |
WO2021245756A1 (ja) | 2021-12-09 |
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