Carrier Localization Effects in InGaN/GaN Multiple-Quantum-Wells LED Nanowires: Luminescence Quantum Efficiency Improvement and "Negative" Thermal Activation Energy

Wei Bao; Zhicheng Su; Changcheng Zheng; Jiqiang Ning; Shijie Xu

doi:10.1038/srep34545

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Carrier Localization Effects in InGaN/GaN Multiple-Quantum-Wells LED Nanowires: Luminescence Quantum Efficiency Improvement and "Negative" Thermal Activation Energy

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Carrier Localization Effects in InGaN/GaN Multiple-Quantum-Wells LED Nanowires: Luminescence Quantum Efficiency Improvement and "Negative" Thermal Activation Energy

Wei Bao, Zhicheng Su, Changcheng Zheng, Jiqiang Ning and Shijie Xu

Scientific reports, Vol.6(1), pp.34545-34545

09/30/2016

DOI: 10.1038/srep34545

PMCID: PMC5043280

PMID: 27686154

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Abstract

Two-dimensional InGaN/GaN multiple-quantum-wells (MQW) LED structure was nanotextured into quasi-one-dimensional nanowires (NWs) with different average diameters with a combination approach of Ni nanoislands as mask + dry etching. Such nanotexturing bring out several appealing effects including deeper localization of carriers and significant improvement in quantum efficiency (e.g., from 4.76% of the planar MQW structure to 12.5% of the 160 nm MQW NWs) of light emission in the whole interested temperature range from 4 K to 300 K. With the aid of localized-state ensemble (LSE) luminescence model, the photoluminescence spectra of the samples are quantitatively interpreted in the entire temperature range. In terms of distinctive temperature dependence of photoluminescence from these samples, a concept of "negative" thermal activation energy is tentatively proposed for the MQW NWs samples. These findings could lead to a deeper insight into the physical nature of localization and luminescence mechanism of excitons in InGaN/GaN nanowires.

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Title: Subtitle: Carrier Localization Effects in InGaN/GaN Multiple-Quantum-Wells LED Nanowires: Luminescence Quantum Efficiency Improvement and "Negative" Thermal Activation Energy
Creators: Wei Bao - University of Hong Kong
Zhicheng Su - University of Hong Kong
Changcheng Zheng - Xi’an Jiaotong-Liverpool University
Jiqiang Ning - University of Hong Kong
Shijie Xu - University of Hong Kong
Resource Type: Journal article
Publication Details: Scientific reports, Vol.6(1), pp.34545-34545
DOI: 10.1038/srep34545
PMID: 27686154
PMCID: PMC5043280
NLM abbreviation: Sci Rep
ISSN: 2045-2322
eISSN: 2045-2322
Publisher: Springer Nature
Number of pages: 9
Grant note: HKU705812P / Hong Kong RGC-GRF Grant AoE/P-03/08 / University Grants Committee Areas of Excellence Scheme of the Hong Kong Special Administrative Region, China 11374247 / National Science Foundation of China; National Natural Science Foundation of China (NSFC)
Language: English
Date published: 09/30/2016
Academic Unit: Epidemiology
Record Identifier: 9984363593702771

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