Transmission electron microscopy observations of twin boundaries and sub-boundary networks in bulk CdZnTe crystals |
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Authors: | Dongmei Zeng Wanqi Jie Tao Wang Hai Zhou |
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Institution: | 1. Department of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China;2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China |
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Abstract: | The microstructure characteristics of the twin boundaries and sub-boundary networks in bulk cadmium zinc telluride (CdZnTe) crystals have been studied by transmission electron microscopy (TEM). Three types of twin boundaries were identified and characterized, which are (i) single straight twin boundary, (ii) tilt twin boundary, and (iii) twin boundary with steps. Boundary dislocations at tilt twin boundary and high dislocation density around steps were observed. The origin of the boundary dislocations is ascribed to the lattice misfit between two tilt grains. The formation of the twin boundary with steps is suggested to be the interaction between the twin boundary and dislocations. Honeycomb-like sub-boundary defects were also observed. The probable reason for the formation of the sub-boundary networks is discussed. |
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Keywords: | 71 55 Gs 68 37 Lp 61 72 Mm 61 72 Yx 74 62 Yb |
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