Morphology evolution of micron-scale secondary phases in CdZnTe crystals grown by vertical Bridgman method

JOURNAL OF ALLOYS AND COMPOUNDS

卷:509

Article

Xu, Yadong^1,2  Jie, Wanqi¹  Wang, Tao¹  Yu, Pengfei¹  He, Yihui¹  Fu, Li¹  Sellin, Paul² 

[1] NW Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[2] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

关键词: CdZnTe;    Te-rich secondary phase;    IR imaging;    Morphology;   

DOI  :  10.1016/j.jallcom.2010.11.013

来源: Elsevier

【 摘 要 】

The morphology and evolution of micron-scale Te-rich secondary phases (SP) are discussed based on IR contrast images. Well-defined, hexagonal or triangular shaped, incoherent Te-rich SP particles were generally identified in as-grown CdZnTe crystals grown with excess Te. The creation of these particles is consistent with the Te-rich droplets encapsulated within the CdZnTe matrix, which grown by accumulation of the point defects. The surrounding CdZnTe crystal dominates the morphology of Te-rich SP particles orienting themselves along crystallographic directions. Star-shaped Te-rich particles and needle-like Te-rich SP clusters were normally revealed in as-grown CdZnTe crystals, obtained under Cd-rich conditions. The former is related to the dislocation loop punching associated with SP particles, which attributed to the internal stress relief. The latter is constituted by numerous small irregular Te precipitates, which is likely produced by the aggregation of Te precipitates along specific paths through thermo-migration during the in situ annealing and cooling processes. (C) 2010 Elsevier B.V. All rights reserved.

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