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Characterization of CdTe:Zn:V crystals grown under microgravity conditions

Published online by Cambridge University Press:  31 January 2011

V. Corregidor ,
V. Babentsov ,
J. L. Castaño ,
M. Fiederle ,
T. Feltgen ,
K. Benz  and
E. Dieguez
V. Corregidor*
Affiliation:
Departamento Fisica de Materiales, Universidad Auto’noma de Madrid, 28049 Madrid, Spain
V. Babentsov
Affiliation:
Kristallographisches Institut, Universitat Freiburg, Hebelstrasse 25, D-79104 Freiburg, Germany
J. L. Castaño
Affiliation:
Departamento Fisica Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
M. Fiederle
Affiliation:
Kristallographisches Institut, Universitat Freiburg, Hebelstrasse 25, D79104 Freiburg, Germany
T. Feltgen
Affiliation:
Kristallographisches Institut, Universitat Freiburg, Hebelstrasse 25, D79104 Freiburg, Germany
K. Benz
Affiliation:
Kristallographisches Institut, Universitat Freiburg, Hebelstrasse 25, D79104 Freiburg, Germany
E. Dieguez
Affiliation:
Departamento Fisica Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
*
a)Address all correspondence to this author.[email protected]
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Abstract

CdTe:Zn:V crystals grown by the seeded Bridgman method in microgravity conditions during the STS95-Spacelab-AGHF-1 mission and in the ground laboratory (l-g) were analyzed and compared. The results obtained clearly show that the structural quality of the space crystal is better. Density of inclusions, concentration of dislocations, and presence of stresses are lower in the microgravity-grown (μ-g) crystal. The l-g crystal contains twins and grains from the beginning of the growth process, that is, from the near-seed region. In general, the concentration of inclusions and amount of segregated impurities on the l-g crystal are larger than in the μ-g crystal. X-ray rocking curves and low-temperature photoluminescence spectra demonstrate the relatively high quality of both crystals on a microscale at the beginning of the growth and show that the l-g conditions were worse at the end. The results of this investigation demonstrate a positive role of contactless growth and μ-g conditions in the melt in suppressing the creation of inclusions and dislocations.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3037 - 3041
Copyright
Copyright © Materials Research Society 2002

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