Cross-sectional scanning tunneling microscopy of buried heterostructure lasers

被引：0
|
作者：
Cobley, R.J. [1 ]
Teng, K.S. [1 ]
Brown, M.R. [1 ]
Maffeïs, T.G.G. [1 ]
Wilks, S.P. [1 ]
机构：
[1] Multidisc. Nanotechnology Centre, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA1 8PP, United Kingdom
来源：
International Journal of Nanoscience | 2004年 / 3卷 / 4-5期
关键词：
Crystal defects - Heterojunctions - Scanning electron microscopy - Scanning tunneling microscopy - Semiconducting indium phosphide - Thermal effects;
D O I：
10.1142/s0219581x04002334
中图分类号：
学科分类号：
摘要：
A single-mode buried heterostructure laser has been imaged using Cross-Sectional Scanning Tunneling Microscopy (X-STM). The problem of positioning the tip on the restricted active region on the (110) face has been overcome using combined Scanning Electron Microscopy (SEM). In order to understand the change in the STM scans when biased, particularly the physical change in surface step defects caused by commercial sample preparation, the experimental setup has been modified to allow the sample to be biased. A simpler double quantum well test structure has been biased and it has been demonstrated that it is possible to continue performing STM whilst the device is powered. The change in the relative contrast across the image has been shown to be unaffected by this external bias for the range scanned, as predicted by a fully-coupled Poison drift-diffusion model calculated using Fermi-Dirac statistics.
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页码：525 / 531
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