Concentration of extended defects in CdZnTe single crystals: Effects of cooling rate after growth

L. Xu, W. Jie, A. E. Bolotnikov, U. N. Roy, J. Stein, A. Hossain, G. S. Camarda, Kihyun Kim, G. Yang, R. Gul, Y. Cui, Y. Xu, T. Wang, G. Zha, R. B. James

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We analyzed two CZT crystals cut from as-grown CdZnTe (CZT) ingots, the only difference between them being the rate of cooling after the crystal growth process. Using White Beam X-ray Diffraction Topography (WBXDT) and Infrared (IR) Transmission Microscopy, we identified and quantified the extended defects, e.g., Te inclusions, dislocations, and sub-grain boundaries. The effects of cooling rate on the size distribution and concentration were studied. The WBXDT and IR images of the fast-cooled crystal revealed very high density of dislocations and sub-grain boundaries, crisscrossing throughout its entire volume, extending from deep inside almost to the surface. In addition, IR analyses showed that the concentration of Te inclusions in the fast-cooled crystal (10 6 cm -3) was higher than that in the slow-cooled one (10 5 cm -3). For the latter, both the WBXDT and the IR images were bright and clear with low concentration of defects. We concluded that slow cooling rate can greatly reduce the number of Te inclusions and inclusion-decorated extended defects in as-grown CZT ingots.

Original languageEnglish
Pages (from-to)84-87
Number of pages4
JournalJournal of Crystal Growth
Volume355
Issue number1
DOIs
Publication statusPublished - 2012 Sep 15
Externally publishedYes

Keywords

  • A1. Extended defect
  • A1. Sub-grain boundary
  • A1. Te inclusion
  • A2. Cooling rate
  • A2. Crystal growth
  • B2. CdZnTe

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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  • Cite this

    Xu, L., Jie, W., Bolotnikov, A. E., Roy, U. N., Stein, J., Hossain, A., Camarda, G. S., Kim, K., Yang, G., Gul, R., Cui, Y., Xu, Y., Wang, T., Zha, G., & James, R. B. (2012). Concentration of extended defects in CdZnTe single crystals: Effects of cooling rate after growth. Journal of Crystal Growth, 355(1), 84-87. https://doi.org/10.1016/j.jcrysgro.2012.06.024