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n-ZnO:Ga/i-ZnO/p-Si heterojunction light emitting diodes fabricated on patterned Si substrates

Title
n-ZnO:Ga/i-ZnO/p-Si heterojunction light emitting diodes fabricated on patterned Si substrates
Authors
Choi, MK[Choi, Mi Kyung]Han, WS[Han, Won Suk]Kim, YY[Kim, Young Yi]Kong, BH[Kong, Bo Hyun]Cho, HK[Cho, Hyung Koun]Kim, JH[Kim, Jae Hyun]Seo, HS[Seo, Hong-Seok]Kim, KP[Kim, Kang-Pil]Lee, JH[Lee, Jung-Ho]
DGIST Authors
Kim, JH[Kim, Jae Hyun]; Seo, HS[Seo, Hong-Seok]; Kim, KP[Kim, Kang-Pil]
Issue Date
2009-12
Citation
Journal of Materials Science: Materials in Electronics, 20(12), 1214-1218
Type
Article
Article Type
Article
Keywords
Ga FilmGalliumGallium AlloysGrain BoundariesGrain Boundary DensitiesGrain Size and ShapeHeterojunctionsHigh DensityHigh TemperatureHole CarriersLight-Emitting DiodesLight EmissionOutput PowerPatterned SubstratesRandom TiltingReverse BiasSemiconducting Silicon CompoundsSemiconducting Zinc CompoundsSi SubstratesSiliconSubstratesVisible EmissionsZinc OxideZnOZnO LayersZnO/p-Si
ISSN
0957-4522
Abstract
N-ZnO:Gai-ZnO/p-Si heterojunction light-emitting diodes were fabricated on patterned Si substrates with increased interface area where hole carriers were transported to the i-ZnO layer. The patterned Si substrates were prepared by electrochemical etching, and the n-type ZnO:Ga films were deposited by high-temperature sputtering. In the patterned LED, the lower breakdown and greater leakage current under a reverse bias was attributed to the formation of a high density of grain boundaries and random tilting of the c-axis. Compared to an LED without patterning, the patterned substrates resulted in approximately 75% improvement in the output power of visible emission, which was attributed to a 1.33-fold increase in the heterojunction area and the increase in grain boundary density due to grain tilting. © Springer Science+Business Media, LLC 2009.
URI
http://hdl.handle.net/20.500.11750/3543
DOI
10.1007/s10854-009-9854-y
Publisher
Springer
Related Researcher
Files:
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Collection:
ETC1. Journal Articles
Smart Textile Convergence Research Group1. Journal Articles


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