JPH05291621A - 窒化ガリウム系化合物半導体の電極材料 - Google Patents

窒化ガリウム系化合物半導体の電極材料

Info

Publication number
JPH05291621A
JPH05291621A JP11822792A JP11822792A JPH05291621A JP H05291621 A JPH05291621 A JP H05291621A JP 11822792 A JP11822792 A JP 11822792A JP 11822792 A JP11822792 A JP 11822792A JP H05291621 A JPH05291621 A JP H05291621A
Authority
JP
Japan
Prior art keywords
gallium nitride
compound semiconductor
type
electrode material
electrode
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.)
Granted
Application number
JP11822792A
Other languages
English (en)
Other versions
JP2778349B2 (ja
Inventor
Masayuki Senoo
雅之 妹尾
Shuji Nakamura
修二 中村
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.)
Nichia Chemical Industries Ltd
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Nichia Chemical Industries Ltd
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Application filed by Nichia Chemical Industries Ltd filed Critical Nichia Chemical Industries Ltd
Priority to JP11822792A priority Critical patent/JP2778349B2/ja
Publication of JPH05291621A publication Critical patent/JPH05291621A/ja
Application granted granted Critical
Publication of JP2778349B2 publication Critical patent/JP2778349B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/40Electrodes ; Multistep manufacturing processes therefor
    • H01L29/43Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
    • H01L29/45Ohmic electrodes
    • H01L29/452Ohmic electrodes on AIII-BV compounds

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Led Devices (AREA)
  • Electrodes Of Semiconductors (AREA)

Abstract

(57)【要約】 【目的】 p型層およびn型層からオーミック接触を得
ることにより、窒化ガリウム系化合物半導体を利用し
て、低駆動電圧化、高輝度化した発光デバイスと実現す
る。 【構成】 p型不純物をドープしたGaXAl1-XNにA
u、Pt、Ag、Niよりなる群から選択される少なく
とも一種の金属、またはそれらの合金を使用し、またn
型不純物をドープしたGaXAl1-XNにはAl、Cr、
Ti、Inよりなる群から選択される少なくとも一種の
金属、またはそれらの合金を使用する。

Description

【発明の詳細な説明】
【0001】
【産業上の利用分野】本発明は紫外、青色発光ダイオー
ド、レーザーダイオード等に使用される窒化ガリウム系
化合物半導体の電極材料に係り、特にオーミック接触を
得ることのできる電極材料に関するものである。
【0002】
【従来の技術】紫外、青色発光ダイオード、レーザーダ
イオード等の発光デバイスの材料として、一般式がGa
XAl1-XN(0≦X≦1)で表される窒化ガリウム系化
合物半導体が知られている。しかし、窒化ガリウム系化
合物半導体の物性については、未だよく解明されておら
ず、窒化ガリウム系化合物半導体のp型層、およびn型
層とオーミック接触を得ることのできる電極材料もよく
知られていないのが実状である。
【0003】
【発明が解決しようとする課題】そのため、窒化ガリウ
ム系化合物半導体を利用して、低駆動電圧化、高輝度化
した発光デバイスと実現するには、p型層およびn型層
からオーミック接触を得ることが不可欠である。
【0004】本発明はこのような事情を鑑み成されたも
ので、窒化ガリウム系化合物半導体のp型層およびn型
層からオーミック接触の得られる電極材料を提供して、
高輝度化、低電圧駆動化できる発光デバイスを実現する
ものである。
【0005】
【課題を解決するための手段】本発明者らはMOCVD
法を用い、サファイア基板上にSiをドープしたn型G
XAl1-XNと、Mgをドープしたp型GaXAl1-X
とをそれぞれ成長させ、さらにp型GaXAl1-XNには
電子線を照射、または500℃以上にアニーリングして
さらに低抵抗なp型とした後、n型及びp型GaXAl
1-XNに数十種類の電極材料を蒸着して、オーミック接
触の確認を取ったところ、特定の金属、またはそれらの
合金に対してのみ良好なオーミック接触が得られること
を発見し、本発明を成すに至った。
【0006】即ち、本発明の窒化ガリウム系化合物半導
体の電極材料は、p型不純物をドープした窒化ガリウム
系化合物半導体にはAu、Pt、Ag、Niよりなる群
から選択される少なくとも一種の金属、またはそれらの
合金を使用することを特徴とするものであり、また、n
型不純物をドープした窒化ガリウム系化合物半導体に
は、Al、Cr、Ti、Inよりなる群から選択される
少なくとも一種の金属、またはそれらの合金を使用する
ことを特徴とするものである。
【0007】
【実施例】図1にp型GaXAl1-XNに電極を蒸着し、
その電流電圧特性を測定してオーミック接触を調べた結
果を示す。はPt電極単独、はNiをベースとし、
その上にAuを設けた電極、はAu電極単独である。
また、いうまでもなくNi電極単独またはNiをベース
としその上にPt、Agを設けた場合はと同一の直線
となる。
【0008】この図に示すようにいずれの電極材料でも
p型層に対しオーミック接触が得られるが、特に好まし
い電極材料としてPt、Niベースの電極を挙げる
ことができる。特にNiをベースとすることにより、例
えば、p型GaXAl1-XNに対しアニーリング等の熱処
理を行った場合、Au電極単独であれば剥がれ落ちてし
まう欠点があるが、アニーリングの熱にも耐えることが
でき、強固に電極を付着させることができる。蒸着する
好ましいNiの厚さは0.01μm〜0.5μmであ
り、その上に形成するAuの厚さは0.01μm〜0.
8μmである。それらの範囲で電極を形成することによ
り、剥がれ落ちにくく、良好なオーミック接触が得られ
る。
【0009】図2にn型GaXAl1-XNに同じく電極を
蒸着し、その電流電圧特性を測定してオーミック接触を
調べた結果を示す。はCrをベースとし、その上にA
lを設けた電極、はAl電極単独、はTi電極単独
である。Cr電極単独またはCrをベースとしその上に
Ti、Inを設けた場合はと同一の直線となる。
【0010】この図に示すようにいずれの電極材料でも
n型層に対しオーミック接触が得られるが、特に好まし
い電極材料としてCrベースの電極、Al電極を挙
げることができる。
【0011】窒化ガリウム系化合物半導体に不純物をド
ープしてp型にし得る不純物としては例えばMg、Z
n、Cd、Be、Ca等を用いることができ、またn型
にし得る不純物としてはSi、Sn、Ge等を用いるこ
とができる。
【0012】
【発明の効果】以上説明したように本発明の電極材料に
よると、好ましくp型及びn型GaXAl1-XNとオーミ
ック接触が得られるため、GaXAl1-XNを利用した発
光ダイオード、レーザーダイオード等の開発に向けてそ
の利用価値は多大である。
【図面の簡単な説明】
【図1】 電極を蒸着したp型GaXAl1-XNの電流電
圧特性を示す図。
【図2】 電極を蒸着したn型GaXAl1-XNの電流電
圧特性を示す図。

Claims (2)

    【特許請求の範囲】
  1. 【請求項1】 p型不純物をドープした一般式GaX
    1-XN(但し0≦X≦1)で表される窒化ガリウム系化
    合物半導体とオーミック接触を得る電極材料として、A
    u、Pt、Ag、Niよりなる群から選択される少なく
    とも一種の金属、またはそれらの合金を使用することを
    特徴とする窒化ガリウム系化合物半導体の電極材料。
  2. 【請求項2】 n型不純物をドープした一般式GaX
    1-XN(但し0≦X≦1)で表される窒化ガリウム系化
    合物半導体とオーミック接触を得る電極材料として、A
    l、Cr、Ti、Inよりなる群から選択される少なく
    とも一種の金属、またはそれらの合金を使用することを
    特徴とする窒化ガリウム系化合物半導体の電極材料。
JP11822792A 1992-04-10 1992-04-10 窒化ガリウム系化合物半導体の電極 Expired - Lifetime JP2778349B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11822792A JP2778349B2 (ja) 1992-04-10 1992-04-10 窒化ガリウム系化合物半導体の電極

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11822792A JP2778349B2 (ja) 1992-04-10 1992-04-10 窒化ガリウム系化合物半導体の電極

Publications (2)

Publication Number Publication Date
JPH05291621A true JPH05291621A (ja) 1993-11-05
JP2778349B2 JP2778349B2 (ja) 1998-07-23

Family

ID=14731374

Family Applications (1)

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US5571391A (en) * 1994-07-15 1996-11-05 Sharp Kabushiki Kaisha Electrode structure and method for fabricating the same
EP0757393A2 (en) * 1995-08-02 1997-02-05 Matsushita Electric Industrial Co., Ltd. Semiconductor light emitting element and method for fabricating the same
JPH09270569A (ja) * 1996-01-25 1997-10-14 Matsushita Electric Ind Co Ltd 半導体レーザ装置
US5701035A (en) * 1994-07-19 1997-12-23 Sharp Kabushiki Kaisha Electrode structure and method for fabricating the same
US5708301A (en) * 1994-02-28 1998-01-13 Sumitomo Chemical Company, Limited Electrode material and electrode for III-V group compound semiconductor
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EP0911888A2 (en) * 1994-03-22 1999-04-28 Toyoda Gosei Co., Ltd. Light emitting semiconductor device using group III nitrogen compound
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JP2000036619A (ja) * 1998-05-13 2000-02-02 Toyoda Gosei Co Ltd Iii族窒化物系化合物半導体発光素子
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EP0911888A3 (en) * 1994-03-22 1999-06-23 Toyoda Gosei Co., Ltd. Light emitting semiconductor device using group III nitrogen compound
US6265726B1 (en) 1994-03-22 2001-07-24 Toyoda Gosei Co., Ltd. Light-emitting aluminum gallium indium nitride compound semiconductor device having an improved luminous intensity
US7332366B2 (en) 1994-03-22 2008-02-19 Toyoda Gosei Co., Ltd. Light-emitting semiconductor device using group III nitrogen compound
EP0911888A2 (en) * 1994-03-22 1999-04-28 Toyoda Gosei Co., Ltd. Light emitting semiconductor device using group III nitrogen compound
US5571391A (en) * 1994-07-15 1996-11-05 Sharp Kabushiki Kaisha Electrode structure and method for fabricating the same
US5701035A (en) * 1994-07-19 1997-12-23 Sharp Kabushiki Kaisha Electrode structure and method for fabricating the same
US5966629A (en) * 1994-07-19 1999-10-12 Sharp Kabushiki Kaisha Method for fabricating an electrode structure
US6429111B2 (en) 1994-07-19 2002-08-06 Sharp Kabushiki Kaisha Methods for fabricating an electrode structure
US6222204B1 (en) 1994-07-19 2001-04-24 Sharp Kabushiki Kaisha Electrode structure and method for fabricating the same
US8934513B2 (en) 1994-09-14 2015-01-13 Rohm Co., Ltd. Semiconductor light emitting device and manufacturing method therefor
US6008539A (en) * 1995-06-16 1999-12-28 Toyoda Gosei Co., Ltd. Electrodes for p-type group III nitride compound semiconductors
EP0757393A2 (en) * 1995-08-02 1997-02-05 Matsushita Electric Industrial Co., Ltd. Semiconductor light emitting element and method for fabricating the same
EP0757393A3 (en) * 1995-08-02 1999-11-03 Matsushita Electric Industrial Co., Ltd. Semiconductor light emitting element and method for fabricating the same
DE19648309B4 (de) * 1995-12-21 2007-10-18 LumiLeds Lighting, U.S., LLC, San Jose Stark reflektierende Kontakte für Licht-emittierende Halbleiterbauelemente
JPH09270569A (ja) * 1996-01-25 1997-10-14 Matsushita Electric Ind Co Ltd 半導体レーザ装置
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