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Crystallization Process and Chemical Disorder in Flash Evaporated Amorphous Gallium Antimonide Films

Published online by Cambridge University Press:  15 February 2011

J. H. Dias Da Silva ,
I. Cisneros  and
L. P. Cardoso
J. H. Dias Da Silva
Affiliation:
UNESP, FC, Depto. De Fisica. CEP 17033–060, Bauru, SP, Brazil
I. Cisneros
Affiliation:
Universidade Estadual de Campinas, Instituto de Fisica. 13081–970. Campinas, SP, Brazil.
L. P. Cardoso
Affiliation:
Universidade Estadual de Campinas, Instituto de Fisica. 13081–970. Campinas, SP, Brazil.
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Abstract

In this work we describe a flash evaporation system specially built to produce Amorphous films of III-V compounds and characterize GaSb films using optical, electrical and X-Ray diffraction Measurements. Changes in the composition of the GaSb samples were obtained by the use of different crucible temperatures. In such samples, consequently, the optical absorption edge and the DC electrical conductivity were Modified. The departure from stoichiometry in GaSb films is analyzed on the basis of these results which can be used as an evidence of the chemical disorder. This kind of disorder is represented by either wrong bonds or sites with different coordination.

Thermal annealing with a sequence of increasing temperatures first induced detectable variations in the optical absorption edge and in the vibrational properties of the Amorphous GaSb. These variations are compatible with the GaSb local ordering and were observed by Raman scattering and infrared absorption spectra. The annealing at higher temperatures allowed the crystallization of the material confirmed by X-Ray diffraction. From these experimental results a crystallization mechanism based on the segregation of Sb excess coming from the crystallized regions toward the Amorphous tissue is proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 645
Copyright
Copyright © Materials Research Society 1994

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References

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