Abstract
Thin-film solar cells from silicon on insulating substrates (SOI) are a serious option to reduce the cost and silicon production mass. Here we investigated nucleation and growth of silicon on alumina and mullite ceramics in a lamps-heating assisted CVD reactor working at atmospheric pressure with trichlorosilane as a precursor gas. The nucleation density and the structural quality of the deposited Si layers were analyzed as a function of the deposition conditions and the structure and composition of the ceramic substrate. The results were compared with the well-known growth mechanism of silicon on amorphous substrates like SiO 2 . Optimal conditions allowed deposition of 20-30μm thick polycrystalline silicon with grains up 15 μm in size and oriented. These layers are very suitable for solar cells processing.
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