Talk:Protocrystalline

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Some conflicting idea with other wiki articles

conflicting information about how crystalline Silicon and amorphous Silicon should absorb light of short and long wavelengths respectively. Can't read German to help verify if citation is valid or plausible.

Refer to http://en.wikipedia.org/wiki/Thin-film_silicon#Micromorphous_silicon 27.54.25.183 (talk) 05:51, 30 October 2011 (UTC)[reply]

I rewrote the relevant part in this article (the German source has an English summary). I think it is all about thickness - a thin amorphous Si (a-Si) layer absorbs mostly via its band gap states; this absorption is lower than in crystalline Si (c-Si) because of the wide band gap of a-Si. In a thick a-Si layer, sub-bandgap absorption via the Urbach tail becomes important (disorder-induced states in the forbidden gap, with relatively low absorption coefficient). In this article, a-Si is used as a thick substrate. Materialscientist (talk) 06:29, 30 October 2011 (UTC)[reply]