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Proceedings Paper

Vapor crystal growth of CdTe under terrestrial and microgravity conditions
Author(s): Klaus-Werner Benz; M. Laasch; T. Kunz; Michael Fiederle; Wolfgang Joerger
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Paper Abstract

CdTe:Cl crystals were successfully grown in a closed vapor transport system under terrestrial and microgravity conditions within the framework of the EURECA-1 mission. The axial as well as radial resistivity distribution differs strongly in 1 g and (mu) g crystals. This is assumed to be due to different vapor transport of major components and dopants and different dopant segregation. For CdTe crystal growth in closed systems, the partial pressures depend sensitively on the composition of the feed material and its pretreatment. This affects the reproducibility of vapor transport: Smallest deviations from the congruently subliming composition yield significant changes in the pCd/pTe(2) ratio and transport-limiting diffusion barriers. Therefore, vapor pressure control by means of a semi-closed growth system is proposed for CdTe vapor transport experiments in microgravity. In ground-based experiments, CdTe crystals were grown in the semi-closed system applying Cl, Ga and V as dopants. The conditions for reproducible transport are discussed. Results of electrical material characterization are presented.

Paper Details

Date Published: 7 July 1997
PDF: 5 pages
Proc. SPIE 3123, Materials Research in Low Gravity, (7 July 1997); doi: 10.1117/12.277706
Show Author Affiliations
Klaus-Werner Benz, Univ. Freiburg (Germany)
M. Laasch, Univ. Freiburg (Germany)
T. Kunz, Univ. Freiburg (Germany)
Michael Fiederle, Univ. Freiburg (Germany)
Wolfgang Joerger, Univ. Freiburg (Germany)


Published in SPIE Proceedings Vol. 3123:
Materials Research in Low Gravity
Narayanan Ramachandran, Editor(s)

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