Facet-Related Non-uniform Photoluminescence in Passivated GaAs Nanowires
Authors
Jiang, Nian
Joyce, Hannah J.
Parkinson, Patrick
Wong-Leung, Jennifer
Tan, Hark Hoe
Jagadish, Chennupati
Publication Date
2020-12-07Journal Title
Frontiers in Chemistry
Publisher
Frontiers Media S.A.
Volume
8
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Jiang, N., Joyce, H. J., Parkinson, P., Wong-Leung, J., Tan, H. H., & Jagadish, C. (2020). Facet-Related Non-uniform Photoluminescence in Passivated GaAs Nanowires. Frontiers in Chemistry, 8 https://doi.org/10.3389/fchem.2020.607481
Abstract
The semiconductor nanowire architecture provides opportunities for non-planar electronics and optoelectronics arising from its unique geometry. This structure gives rise to a large surface area-to-volume ratio and therefore understanding the effect of nanowire surfaces on nanowire optoelectronic properties is necessary for engineering related devices. We present a systematic study of the non-uniform optical properties of Au-catalyzed GaAs/AlGaAs core–shell nanowires introduced by changes in the sidewall faceting. Significant variation in intra-wire photoluminescence (PL) intensity and PL lifetime (τPL) was observed along the nanowire axis, which was strongly correlated with the variation of sidewall facets from {112} to {110} from base to tip. Faster recombination occurred in the vicinity of {112}-oriented GaAs/AlGaAs interfaces. An alternative nanowire heterostructure, the radial quantum well tube consisting of a GaAs layer sandwiched between two AlGaAs barrier layers, is proposed and demonstrates superior uniformity of PL emission along the entire length of nanowires. The results emphasize the significance of nanowire facets and provide important insights for nanowire device design.
Keywords
Chemistry, nanowire, photoluminescence (PL), nanowire sidewall facets, surface recombination, uniformity, GaAs-AlGaAs
Identifiers
External DOI: https://doi.org/10.3389/fchem.2020.607481
This record's URL: https://www.repository.cam.ac.uk/handle/1810/315473
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/