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Recrystallisation of Cadmium Sulphide Powder Films with a CO2 Laser

Published online by Cambridge University Press:  28 February 2011

P. E. Barden and
T. J. Cumberbatch
P. E. Barden
Affiliation:
Engineering Department, Cambridge University, Trumpington Street, Cambridge, England CB2 1PZ
T. J. Cumberbatch
Affiliation:
Engineering Department, Cambridge University, Trumpington Street, Cambridge, England CB2 1PZ
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Abstract

Thin films (1–2μm) of cadmium sulphide, deposited by electrophoresis, consist of a close packed layer of randomly oriented cubic-phase microcrystalline particles with an average diameter of 30nm. A CW CO2 laser, operating at 10.6μm has been used to convert this into a polycrystalline structure with columnar crystals, of hexagonal phase, which extend through the thickness of the film and whose c-axis is perpendicular to the substrate. The recrystallised regions comprise aligned grains up to 300nm in diameter whose cathodoluminescence spectrum exhibits a narrow peak centred at 2.42eV with a half width identical to that for evaporated CdS (0.1eV).

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