The crystallization behaviour of Ni doped co-sputtered amorphous silicon thin films (MSP a-Si(Ni)) is investigated by means of NIR-VIS-UV transmission spectroscopy and STEM. Using the change in optical transmission spectra of crystallized a-Si(Ni) thin films the crystallization kinetics is described. During a thermal annealing process the crystalline phase forms at one edge of the sample and then extends across the whole thin film, At the crystallization frontier a needle morphology of single crystals is observed with STEM which may result from solid state diffusion of nickel through the amorphous matrix. Using a long term thermal treatment we achieve the formation of extensive monocrystalline networks.
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Blum N. A., 1972, Journal of Non-Crystalline Solids, V11, P242, DOI 10.1016/0022-3093(72)90006-3