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Highly thermally stable Pd/Zn/Ag ohmic contact to Ga-face p-type GaN

Authors
Kim, Dae-HyunLim, Weon CheolPark, Jae-SeongSeong, Tae-Yeon
Issue Date
5-3월-2014
Publisher
ELSEVIER SCIENCE SA
Keywords
Metals and alloys; Electrode materials; Surfaces and interfaces; Light absorption and reflection; Optical properties
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.588, pp.327 - 331
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
588
Start Page
327
End Page
331
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/99031
DOI
10.1016/j.jallcom.2013.11.044
ISSN
0925-8388
Abstract
Pd/Zn/Ag ohmic contacts to Ga-face p-type GaN were investigated as a function of annealing temperature. The Pd/Zn/Ag ohmic contacts exhibited a reflectance of 85% at 450 nm, which is higher than that of Ag-only contacts (57%) after annealing at 500 degrees C. The alleviated agglomeration of the Pd/Zn/Ag ohmic contact due to the formation of ZnO at the surface seems to be responsible for the higher reflectance. The specific contact resistances of Ag-only and Pd/Zn/Ag contacts annealed at 500 degrees C were 2.4 x 10 (4) and 6.1 x 10 (5) Omega cm(2), respectively. GaN-based light-emitting diodes (LEDs) fabricated with the Pd/Zn/Ag contacts exhibited similar to 20% higher output power at 20 mA than the LEDs fabricated with the Ag-only contacts annealed at 500 degrees C. On the basis of X-ray photoemission spectroscopy and SEM results, the improved electrical and thermal properties are described. (C) 2013 Elsevier B. V. All rights reserved.
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SEONG, TAE YEON
공과대학 (신소재공학부)
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