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Explosive Crystallization in A-Ge Films Irradiated with Microsecond Laser Pulses

Published online by Cambridge University Press:  25 February 2011

R.K. Sharma  and
S.K. Bansal
R.K. Sharma
Affiliation:
Department of Physics and Astro Physics, University of Delhi Delhi - 110007, India
S.K. Bansal
Affiliation:
Department of Physics and Astro Physics, University of Delhi Delhi - 110007, India
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Abstract

Explosive crystallisation has been observed in deposited a-Ge films irradiated with pulsed Nd-glass laser beam of 400 micro second duration. Transmission electron microscopic examination of the irradiated film shows a polycrystalline region surrounded by radial dendrites of ~ 8-10 ;Cm size. Analysis of the results is consistent with the duplex-melting model of the explosive crystallisation mechanism. Heat released during the amorphous to crystalline transformation of a localised region abruptly crystallises the surrounding area resulting in dendritic growth. The crystallisation is self-sustaining untill the temperature ahead of liquid/amorphous interface drops below 775 K. These results are consistent with earlier study of explosive crystallisation in unsupported a-Ge films and further confirm that the heat loss to the underlying substrate governs the dynamics of the crystallisation process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 35: Symposium A – Energy Beam-Solid Interactions and Transient Thermal Processing/1984 , 1984 , 251
Copyright
Copyright © Materials Research Society 1985

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References

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