Influence of Free-space Volume in Ampoule on Defects of CdZnTe Crystal Grown by Bridgman Method

doi:10.3724/SP.J.1077.2012.11548

Journal of Inorganic Materials ›› 2012, Vol. 27 ›› Issue (8): 790-794.DOI: 10.3724/SP.J.1077.2012.11548

• Research Paper • Previous Articles Next Articles

Influence of Free-space Volume in Ampoule on Defects of CdZnTe Crystal Grown by Bridgman Method

LI Hui¹, MIN Jia-Hua¹, WANG Lin-Jun¹, XIA Yi-Ben¹, ZHANG Ji-Jun¹, YE Bang-Jiao²

(1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China; 2. School of Physical Sciences University of Science and Technology of China, Hefei 230022, China)

Received:2011-08-30 Revised:2011-12-18 Published:2012-08-20 Online:2012-07-09
About author:LI Hui. E-mail: lihuikkk@163.com
Supported by:
National Natural Science Foundation of China (10675080); Shanghai Leading Academic Disciplines (S30107)

Abstract

Abstract: CdZnTe crystal was grown by Bridgman method. The relationship between the free-space volume in the ampoule and the defects in CZT, such as Te inclusion and Cd vacancy, was studied by IR transmission microscopy and positron annihilation technique (PAT). With the decrease of the free-space volume in the ampoule, the density reduced from 6.67×10⁴/cm² to 2.36×10³/cm² with the reduction of Te inclusions. The average positron lifetime decreased from 325.4 ps to 323.4 ps with the decrease of the free-space volume, indicating a reduction of Cd vacancies. The improvement of IR transmittance and resistivity of CZT further demonstrates that lowing the free-space volume in the ampoule can effectively depress the defects in CZT crystal.

Key words: CdZnTe, defect, PAT, Te inclusions

CLC Number:

LI Hui, MIN Jia-Hua, WANG Lin-Jun, XIA Yi-Ben, ZHANG Ji-Jun, YE Bang-Jiao. Influence of Free-space Volume in Ampoule on Defects of CdZnTe Crystal Grown by Bridgman Method[J]. Journal of Inorganic Materials, 2012, 27(8): 790-794.

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Influence of Free-space Volume in Ampoule on Defects of CdZnTe Crystal Grown by Bridgman Method

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