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Carrier Lifetime and Mobility Enhancement in Nearly Defect-Free Core-Shell Nanowires Measured Using Time-Resolved Terahertz Spectroscopy

Parkinson, Patrick Wallace; Joyce, Hannah J; Gao, Qiang; Tan, Hoe Hark; Zhang, Xin; Jagadish, Chennupati; Herz, Laura; Johnston, Michael B


We have used transient terahertz photoconductivity measurements to assess the efficacy of two-temperature growth and core-shell encapsulation techniques on the electronic properties of GaAs nanowires. We demonstrate that two-temperature growth of the GaAs core leads to an almost doubling in charge-carrier mobility and a tripling of carrier lifetime. In addition, overcoating the GaAs core with a larger-bandgap material is shown to reduce the density of surface traps by 82%, thereby enhancing the...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
Source: Nano Letters
DOI: 10.1021/nl9016336


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