Polarization dependent photocurrent spectroscopy of single wurtzite GaAs/AlGaAs core-shell nanowires

被引：28
|
作者：
Kim, D. C. [1 ]
Dheeraj, D. L. [1 ]
Fimland, B. O. [1 ]
Weman, H. [1 ]
机构：
[1] Norwegian Univ Sci & Technol, Dept Elect & Telecommun, NO-7491 Trondheim, Norway
来源：
APPLIED PHYSICS LETTERS | 2013年 / 102卷 / 14期
关键词：
SELECTION-RULES; GAN-NANOWIRES; GAAS; ZINCBLENDE;
D O I：
10.1063/1.4801865
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The optoelectronic properties of single wurtzite GaAs/AlGaAs core-shell nanowires with electrical contacts to the GaAs core are investigated by polarization dependent photocurrent spectroscopy. It is shown that the optical selection rules of the wurtzite GaAs band structure play a major role in observed reversals of the polarization anisotropy in photocurrent as the excitation laser energy changes. The general features of the polarization dependent photocurrent spectra are explained by considering additional effects such as the nanowire dielectric mismatch, Urbach tail, and Franz-Keldysh effect. The optical selection rules allow us to estimate the heavy-hole/light-hole splitting to be similar to 90 meV in wurtzite GaAs. (C) 2013 AIP Publishing LLC
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页数：5
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