Ultraviolet electroluminescence from a n-ZnO filmp-GaN heterojunction under both forward and reverse bias

doi:10.1039/c8tc04507k

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	Ultraviolet electroluminescence from a n-ZnO filmp-GaN heterojunction under both forward and reverse bias
	Ai, Q.; Liu, K. W.; Ma, H. Y.; Yang, J. L.; Chen, X.; Li, B. H.; Shen, D. Z.
刊名	Journal of Materials Chemistry C
	2018
卷号	6 期号:42 页码:11368-11373
关键词	light-emitting-diodes microwire barriers band Materials Science Physics
ISSN号	2050-7526
DOI	10.1039/c8tc04507k
英文摘要	ZnO film was fabricated on p-GaN film using the molecular beam epitaxy technique to form heterojunction light emitting diodes (LEDs). The devices exhibited strong light emission under both forward and reverse bias. The origin of different luminescence peaks has been investigated by comparing electroluminescence (EL) and photoluminescence spectra. When a forward bias is applied to the device, intense ultraviolet emission at approximate to 376 nm originating from ZnO rather than GaN can be observed, which is associated with the larger hole mobility of p-GaN than the electron mobility of n-ZnO. Under the reverse bias, the device shows broad emission at 520 nm originating from deep level-related recombination in ZnO, emission at 430 nm from GaN, 376 nm from ZnO and weak emission at 408 nm from the interface with a lower injection current of 10 mA. As the injection reverse current increases to 20 mA, the EL emission at 376 nm exhibits a dramatic increase in intensity without a peak shift. The emission mechanism of the heterojunction LED is discussed in terms of interface states and energy band theory. Our findings in this work provide an innovative path for the design and development of ZnO-based ultraviolet diodes.
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/61214]
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Ai, Q.,Liu, K. W.,Ma, H. Y.,et al. Ultraviolet electroluminescence from a n-ZnO filmp-GaN heterojunction under both forward and reverse bias[J]. Journal of Materials Chemistry C,2018,6(42):11368-11373.
APA	Ai, Q..,Liu, K. W..,Ma, H. Y..,Yang, J. L..,Chen, X..,...&Shen, D. Z..(2018).Ultraviolet electroluminescence from a n-ZnO filmp-GaN heterojunction under both forward and reverse bias.Journal of Materials Chemistry C,6(42),11368-11373.
MLA	Ai, Q.,et al."Ultraviolet electroluminescence from a n-ZnO filmp-GaN heterojunction under both forward and reverse bias".Journal of Materials Chemistry C 6.42(2018):11368-11373.