JPS631056A - Optoelectric transducer - Google Patents

Optoelectric transducer

Info

Publication number
JPS631056A
JPS631056A JP61144246A JP14424686A JPS631056A JP S631056 A JPS631056 A JP S631056A JP 61144246 A JP61144246 A JP 61144246A JP 14424686 A JP14424686 A JP 14424686A JP S631056 A JPS631056 A JP S631056A
Authority
JP
Japan
Prior art keywords
layer
section
substrate
type
defective
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP61144246A
Other languages
Japanese (ja)
Inventor
Masaru Kubo
勝 久保
Takuya Ito
卓也 伊藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP61144246A priority Critical patent/JPS631056A/en
Publication of JPS631056A publication Critical patent/JPS631056A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14Devices 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
    • H01L27/144Devices controlled by radiation
    • H01L27/1443Devices controlled by radiation with at least one potential jump or surface barrier

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Solid State Image Pick-Up Elements (AREA)
  • Light Receiving Elements (AREA)

Abstract

PURPOSE:To improve reliability, and to obtain normal operation even with fine currents by forming a defective layer into a substrate and preventing carriers generated in the defective layer and a nondefective layer in the lower section of the defective layer from reaching a photodiode section and a signal processing section. CONSTITUTION:A defective layer 12 in an element is shaped by thermally treating a P-type substrate 11 and precipitating oxygen in a wafer, thus forming nondefective layers 13, 38 in the substrate 11 in the vicinity of the defective layer 12. Carriers generated in the layers 12 and 28 cannot reach a junction surface between an N-type epitaxial layer 32 in an N-P-N transistor section 14 and the substrate 11, a junction surface between an N-type epitaxial layer 21 in a P-N-P transistor section 15 and the substrate 11 and a junction surface between an N-type buried diffusion layer 24 in a photodiode section 16 and the substrate 11. Accordingly, only carriers 29 generated in the nondefective layer 13 formed to the upper section of the defective layer 12 can function as parasitic photocurrents.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光が照射されて使用される光電変換素子に関
するものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a photoelectric conversion element that is used by being irradiated with light.

〔従来技術〕[Prior art]

従来の光電変換素子は、第2図に示すように、P型基板
4上に形成されたNPNトランジスタ部1とPNPトラ
ンジスタ部2とは、その上方に形成された図示しない第
2メタル層により遮光されている。−方、P型基板4上
に形成されたホトダイオード部3は光を入射させる必要
があるということから、その上方には上記第2メタル層
が形成されていない構造である。
In the conventional photoelectric conversion element, as shown in FIG. 2, an NPN transistor section 1 and a PNP transistor section 2 formed on a P-type substrate 4 are shielded from light by a second metal layer (not shown) formed above them. has been done. - On the other hand, since the photodiode section 3 formed on the P-type substrate 4 needs to allow light to be incident thereon, the structure is such that the second metal layer is not formed above it.

ところが、上記従来の構造では、ホトダイオード部3か
ら入射される光によって、上記P型基板4内にキャリア
5・・・が発生する。このキャリア5・・・は、P型基
板4内でのライフタイムが長いということに起因して、
上記PNP )ランジスタ部2におけるN型エピタキシ
ャル層6とP型基板4との接合面や、NPN トランジ
スタ部1におけるN型エピタキシャル層6とP型基板4
との接合面や、或いはホトダイオード部3のN型埋込拡
散層7とP型基板4との接合面に達する。これにより、
上記の接合面で寄生光電流が発生する。この寄生光電流
は、NPN )ランジスタ部1ではコレクタ基W、間電
流止なる一方、PNP )ランジスタ部2ではベース電
流となる。このため、微小電流を扱うことが多い光電変
換素子では、回路の誤動作を生じ、特に、PNP トラ
ンジスタ部2ではベース電流となるため、誤動作が顕著
に生じるという問題を有していた。
However, in the conventional structure described above, carriers 5 . This carrier 5... has a long lifetime within the P-type substrate 4, so
(PNP) The bonding surface between the N-type epitaxial layer 6 and the P-type substrate 4 in the transistor section 2, and the junction surface between the N-type epitaxial layer 6 and the P-type substrate 4 in the NPN transistor section 1.
or the junction surface between the N-type buried diffusion layer 7 of the photodiode section 3 and the P-type substrate 4. This results in
A parasitic photocurrent is generated at the above junction surface. This parasitic photocurrent becomes a collector current in the NPN) transistor section 1, whereas it becomes a base current in the PNP) transistor section 2. For this reason, in photoelectric conversion elements that often handle minute currents, circuit malfunctions occur, and in particular, in the PNP transistor section 2, the base current becomes a base current, so malfunctions occur significantly.

〔発明の目的〕[Purpose of the invention]

本発明は、上記従来の問題点を考慮してなされたもので
あって、寄生光電流を従来と比べて大幅に減少させるこ
とにより、著しく信頼性を向上させることができ、かつ
、非常に微小な電流でも正常に作動させることができる
光電変換素子の提供を目的とするものである。
The present invention has been made in consideration of the above-mentioned conventional problems, and by significantly reducing the parasitic photocurrent compared to the conventional method, it is possible to significantly improve reliability, and to achieve extremely small The object of the present invention is to provide a photoelectric conversion element that can be operated normally even with a large current.

〔発明の構成〕[Structure of the invention]

本発明の光電変換素子は、上記の目的を達成するために
、基板上に、ホトダイオード部とこのホトダイオード部
の信号を処理する信号処理部とが形成された光電変換素
子において、上記基板内に欠陥層を形成し、欠陥層とこ
の欠陥層の下部に形成される無欠陥層とで発生するキャ
リアが、ホトダイオード部や信号処理部に到達するのを
防止し得るように構成したことを特徴とするものである
In order to achieve the above object, the photoelectric conversion element of the present invention is a photoelectric conversion element in which a photodiode section and a signal processing section for processing a signal of the photodiode section are formed on a substrate, in which defects are detected in the substrate. A layer is formed, and carriers generated in a defect layer and a defect-free layer formed below the defect layer can be prevented from reaching a photodiode section or a signal processing section. It is something.

〔実施例〕〔Example〕

本発明の一実施例を第1図に基づいて以下に説明する。 An embodiment of the present invention will be described below with reference to FIG.

本実施例に係る光電変換素子は、イントリンシックゲッ
タリングにより形成される欠陥層12と、この欠陥層1
2の両面に形成されている無欠陥層13・28とから成
るP型基板11を有している。
The photoelectric conversion element according to this example includes a defect layer 12 formed by intrinsic gettering, and a defect layer 12 formed by intrinsic gettering.
The P-type substrate 11 includes defect-free layers 13 and 28 formed on both sides of the P-type substrate 11.

このP型基板11上には、信号処理部であるNPNPN
トランジスタ4及びPNP I−ランジスタ部15と、
ホトダイオード部16とが形成されており、これら信号
処理部とホトダイオード部16との間にはP型分離拡散
層30・・・が形成されている。
On this P-type substrate 11, a signal processing section NPNPN
a transistor 4 and a PNP I-transistor section 15;
A photodiode section 16 is formed, and a P-type isolation diffusion layer 30 . . . is formed between the signal processing section and the photodiode section 16.

ここで、上記NPN l−ランジスタ部14にはN型埋
込拡散Ji31が形成されており、N型埋込拡散層31
の上部にはN型エピタキシャル層32が形成されている
。また、このN型エピタキシャル層32内には、その内
部にN型拡散層18を有するP型拡散層17と、N型拡
散層19とが形成されている。さらに、NPNトランジ
スタ部1部上4上、アルミニウム等から成る図示しない
第2メタル層が形成されている。
Here, an N-type buried diffusion Ji31 is formed in the NPN l-transistor section 14, and an N-type buried diffusion layer 31 is formed.
An N-type epitaxial layer 32 is formed on top of the. Further, in this N-type epitaxial layer 32, a P-type diffusion layer 17 having an N-type diffusion layer 18 therein and an N-type diffusion layer 19 are formed. Furthermore, a second metal layer (not shown) made of aluminum or the like is formed on the upper portion 4 of the NPN transistor portion 1 .

同様に、上記PNP I−ランジスタ部15とホトダイ
オード部16とには、N型埋込拡散層20・24が形成
されており、N型埋込拡散層20・24の上部にはN型
エピタキシャル層21・25が形成されている。そして
、PNPトランジスタ部15では、上記N型エピタキシ
ャル層21内にP型拡散層22・・・とN型拡散層23
とが形成されており、NPN I−ランジスタ部15上
には上記第2メタル層が形成されている。−方、ホトダ
イオード部16では、上記N型エピタキシャル層25内
にP型拡散層26とN型拡散層27とが形成されており
、ホトダイオード部16上には上記第2メタル層が形成
されていない構造となっている。
Similarly, N-type buried diffusion layers 20 and 24 are formed in the PNP I-transistor section 15 and photodiode section 16, and an N-type epitaxial layer is formed above the N-type buried diffusion layers 20 and 24. 21 and 25 are formed. In the PNP transistor section 15, the N-type epitaxial layer 21 includes P-type diffusion layers 22... and an N-type diffusion layer 23.
are formed, and the second metal layer is formed on the NPN I-transistor section 15. - On the other hand, in the photodiode section 16, a P-type diffusion layer 26 and an N-type diffusion layer 27 are formed in the N-type epitaxial layer 25, and the second metal layer is not formed on the photodiode section 16. It has a structure.

上記の構造を有する光電変換素子の欠陥層12は、イン
トリンシックゲッタリングにより形成される。このイン
トリンシックゲッタリングは、通常、P型基板11を適
当な温度で熱処理することによりウェハー内の酸素を析
出して、欠陥層12を形成し、これにより、欠陥層12
の近傍のP型基板11に無欠陥層13・28を形成する
ものである。
The defect layer 12 of the photoelectric conversion element having the above structure is formed by intrinsic gettering. In this intrinsic gettering, oxygen in the wafer is precipitated by heat-treating the P-type substrate 11 at an appropriate temperature, thereby forming a defect layer 12.
The defect-free layers 13 and 28 are formed on the P-type substrate 11 in the vicinity of the P-type substrate 11 .

ここで、上記欠陥層12の内部におけるキャリアのライ
フタイムは非常に短いということが知られている。した
がって、欠陥層12とこの欠陥層12の下部に形成され
た無欠陥層28とで発生したキャリアは、NPN)ラン
ジスタ部14のN型エピタキシャルJW32とP型基板
11との接合面や、PNP I−ランジスタ部15のN
型エピタキシャル層21とP型基板11との接合面や、
或いはホトダイオード部16のN型埋込拡散層24とP
型基板11との接合面に到達することができない。
Here, it is known that the lifetime of carriers inside the defective layer 12 is extremely short. Therefore, carriers generated in the defect layer 12 and the defect-free layer 28 formed under the defect layer 12 are transferred to the junction surface between the N-type epitaxial JW 32 of the NPN transistor section 14 and the P-type substrate 11, and to the PNP I - N of transistor section 15
The bonding surface between the type epitaxial layer 21 and the P type substrate 11,
Alternatively, the N-type buried diffusion layer 24 of the photodiode section 16 and the P
The bonding surface with the mold substrate 11 cannot be reached.

この結果、欠陥層12の上部に形成された無欠陥層13
で発生したキャリア29・・・のみが寄生光電流となり
うる。したがって、NPN l−ランジスタ部14等で
生じる寄生光電流を大幅に低減することができる。
As a result, a defect-free layer 13 formed on the top of the defect layer 12
Only the carriers 29 generated in the above can become a parasitic photocurrent. Therefore, the parasitic photocurrent generated in the NPN l-transistor section 14 and the like can be significantly reduced.

〔発明の効果〕 本発明の光電変換素子は、以上のように、基板内に欠陥
層が形成されているので、回路を作動させる場合に問題
となっていた寄生光電流の発生を飛躍的に減少させるこ
とができる。この結果、従来と比べて、より微小な電流
で作動させる光電変換素子を容易に製造することができ
、かつ、従来型の光電変換素子における信頼性を著しく
向上させることができる等の効果を奏しうる。
[Effects of the Invention] As described above, since the photoelectric conversion element of the present invention has a defective layer formed within the substrate, it can dramatically reduce the generation of parasitic photocurrent that has been a problem when operating a circuit. can be reduced. As a result, compared to conventional photoelectric conversion elements, it is possible to easily manufacture photoelectric conversion elements that operate with a smaller current, and the reliability of conventional photoelectric conversion elements can be significantly improved. sell.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示す要部説明図、第2図は
従来の光電変換素子を示す要部説明図である。 11はP型基板(基板)、12は欠陥層、13・28は
無欠陥層、14はNPN l−ランジスタ部(信号処理
部)、15はPNPトランジスタ部(信号処理部)、1
6はホトダイオード部、24はN型埋込拡散層、21・
32はN型エピタキシャル層である。
FIG. 1 is an explanatory diagram of a main part showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a main part showing a conventional photoelectric conversion element. 11 is a P-type substrate (substrate), 12 is a defective layer, 13 and 28 are defect-free layers, 14 is an NPN l-transistor section (signal processing section), 15 is a PNP transistor section (signal processing section), 1
6 is a photodiode section, 24 is an N-type buried diffusion layer, 21.
32 is an N-type epitaxial layer.

Claims (1)

【特許請求の範囲】[Claims] 1、基板上に、ホトダイオード部とこのホトダイオード
部の信号を処理する信号処理部とが形成された光電変換
素子において、上記基板内に欠陥層を形成したことを特
徴とする光電変換素子。
1. A photoelectric conversion element in which a photodiode section and a signal processing section for processing signals from the photodiode section are formed on a substrate, characterized in that a defect layer is formed in the substrate.
JP61144246A 1986-06-20 1986-06-20 Optoelectric transducer Pending JPS631056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61144246A JPS631056A (en) 1986-06-20 1986-06-20 Optoelectric transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61144246A JPS631056A (en) 1986-06-20 1986-06-20 Optoelectric transducer

Publications (1)

Publication Number Publication Date
JPS631056A true JPS631056A (en) 1988-01-06

Family

ID=15357637

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61144246A Pending JPS631056A (en) 1986-06-20 1986-06-20 Optoelectric transducer

Country Status (1)

Country Link
JP (1) JPS631056A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010263293A (en) * 2009-04-30 2010-11-18 Shirinkusu Kk Current-voltage conversion circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010263293A (en) * 2009-04-30 2010-11-18 Shirinkusu Kk Current-voltage conversion circuit

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