Study on Micro-structural Properties of PbTe/Cd 0.98 Zn 0.02 Te (111)Hetero-system Grown by Molecular-beam Epitaxy

doi:10.3724/SP.J.1077.2008.00545

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Study on Micro-structural Properties of PbTe/Cd _0.98 Zn _0.02 Te (111)Hetero-system Grown by Molecular-beam Epitaxy

SI Jian-Xiao ¹, WU Hui-Zhen ¹, XU Tian-Ning ¹, XIA Ming-Long ¹, WANG Qing-Lei ¹, LU Ye-Qing ¹, FANG Wei-Zheng ², DAI Ning ²

1. Department of Physics, Zhejiang University, Hangzhou 310027, China;

2. Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

Received:2007-06-19 Revised:2007-08-29 Published:2008-05-20 Online:2008-05-20

Abstract

Abstract: The surface structure of PbTe epitaxial layers on Cd _0.98 Zn _0.02 Te (111) grown by molecular beam epitaxy was studied by atomic force microscope. It is shown that the surface is dominated by terraces with triangular shape and anomalous spiral steps. In order to clarify the origin of the triangular shape and spiral steps, PbTe/Cd _0.98 Zn _0.02 Te heteroepitaxial layers were investigated by using a high-resolution transmission electron microscope (HRTEM). As a result, it is confirmed that the triangular shape and spiral steps originate from the intrinsic Frank dislocations represented in PbTe/Cd _0.98 Zn _0.02 Te interface. Considering the effect of the kinetics of dislocations, it is
revealed that the strain field arising from dislocations affects the formation of spiral steps. The experiments data are in agreement with the calculations based on elasticity theory and dislocation gliding theory.

Key words: heteroepitaxy, surface structure, dislocation

CLC Number:

TN304

SI Jian-Xiao,WU Hui-Zhen,XU Tian-Ning,XIA Ming-Long,WANG Qing-Lei,LU Ye-Qing,FANG Wei-Zheng,DAI Ning. Study on Micro-structural Properties of PbTe/Cd _0.98 Zn _0.02 Te (111)Hetero-system Grown by Molecular-beam Epitaxy
[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00545.

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Study on Micro-structural Properties of PbTe/Cd _0.98 Zn _0.02 Te (111)Hetero-system Grown by Molecular-beam Epitaxy

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