# US 5,708,301 A · Electrode material and electrode for III-V group compound semiconductor

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- Number: US 5,708,301 A
- Document ID: US5708301A
- Status: Granted
- Kind: A
- Application number: 08/392,244
- Filed: 1995-02-22
- Granted: 1998-01-13
- Earliest claimed: 1994-02-28
- Assignees: Sumitomo Chemical Company, Limited
- Inventors: Yasushi Iyechika; Noboru Fukuhara; Tomoyuki Takada; Yoshinobu Ono
- Web page: https://patentgrep.com/patent/US5708301A

## CPC

- H10H 20/832: characterised by their material
- H10H 20/824: comprising only Group III-V materials, e.g. GaP
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

The invention provides an electrode material having the low contact resistance against a III-V group compound semiconductor, thereby realizing a light emitting device having a high luminance and driven at low voltages. The electrode material of the invention is applied to a III-V group compound semiconductor, which is expressed as a general formula of In.sub.x Ga.sub.y Al.sub.z N, where x+y+z=1, 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.1, and 0.ltoreq.z.ltoreq.1, and doped with p-type impurities. The electrode material comprises an alloy of Au and at least one metal selected from the group consisting of Mg and Zn.

## Claims

### Claim 1

An electrode device which comprises a first electrode of an alloy of AU and at least one metal selected from the group consisting of Mg and Zn, said first electrode being provided on a III-V group compound semiconductor expressed as a general formula of In.sub.x Ga.sub.y Al.sub.z N, where x+y+z=1, 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.1, and 0.ltoreq.z.ltoreq.1, said compound semiconductor being doped with p-type impurities, and a second metal electrode deposited on a portion of said first electrode and a portion of said semiconductor.

### Claim 2 (depends on 1)

The electrode device of claim 1, wherein said second metal electrode is formed from a metal selected from the group consisting of aluminum, titanium and chromium.

### Claim 3 (depends on 2)

The electrode device of claim 2, wherein said second metal electrode is firmed from aluminum.