Anisotropic laser crystallization of a-Se

Anisotropic laser-stimulated crystallization is reported for amorphous selenium (Se) films due to irradiation by linearly polarized He–Ne or Ti:Sapphire (630–750 nm) laser beams with sample temperatures at and slightly above the glass transition temperature. Both β-monoclinic and hexagonal crystalli...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1998-01, Vol.227, p.732-738
Main Authors: Tikhomirov, V.K, Hertogen, P, Adriaenssens, G.J, Glorieux, C, Ottenburgs, R
Format: Article
Language:English
Subjects:
Amorphous selenium (a-Se) film
Anisotropic laser crystallization
Hexagonal ( γ-Se) crystalline phase
β-Monoclinic phase
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Summary:Anisotropic laser-stimulated crystallization is reported for amorphous selenium (Se) films due to irradiation by linearly polarized He–Ne or Ti:Sapphire (630–750 nm) laser beams with sample temperatures at and slightly above the glass transition temperature. Both β-monoclinic and hexagonal crystalline phases are detected in the crystallized film by X-ray diffraction (XRD) measurements. The optical contrast between crystalline and amorphous parts of the film is larger when crystallization is induced by linearly polarized light as compared to crystallization by unpolarized light. The origin of anisotropic nuclei and their anisotropic growth is discussed and it is shown that the mechanisms of optically and thermally induced crystallization are essentially different.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(98)00155-0