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High Quality CdTe Growth by Gradient Freeze Method

Published online by Cambridge University Press:  25 February 2011

A. Tanaka ,
Y. Masa ,
S. Seto  and
T. Kawasaki
A. Tanaka
Affiliation:
Electronics Materials Laboratory, Sumitomo Metal Mining Co., Ltd. Suehiro-cho, Ohme-shi, Tokyo 198, Japan
Y. Masa
Affiliation:
Electronics Materials Laboratory, Sumitomo Metal Mining Co., Ltd. Suehiro-cho, Ohme-shi, Tokyo 198, Japan
S. Seto
Affiliation:
Electronics Materials Laboratory, Sumitomo Metal Mining Co., Ltd. Suehiro-cho, Ohme-shi, Tokyo 198, Japan
T. Kawasaki
Affiliation:
Electronics Materials Laboratory, Sumitomo Metal Mining Co., Ltd. Suehiro-cho, Ohme-shi, Tokyo 198, Japan
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Abstract

The vertical Bridgman method, a gradient freeze technique, is feasible for the growth of high quality, large CdTe crystals. The equi-composition contour of Zn in doped crystals has been used to reveal the solid-liquid interface shape in the growth process. A slow cooling rate is necessary to obtain a convex interface shape. A low temperature gradient at the solid-liquid interface, down to 2 °C/cm, and Zn doping are found to be effective to reduce the etch pit density to 5×103/cm2 (minimum) to 104/cm2 (average). The crystallographic quality has been evaluated by means of X-ray diffraction, X-ray topography, etch pit delineation with the Nakagawa etchant, infrared measurements, photoluminescence and Hall effect measurements. CdTe crystals are found to be free from subgrain structure, Te precipitates and deep levels, and have high electron mobility.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 90: Symposium R – Materials for Infrared Detectors and Sources , 1986 , 111
Copyright
Copyright © Materials Research Society 1987

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References

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