A reversible photo-induced change was observed in the polarization dependence of a transverse electro-absorption signal from hydrogenated amorphous material. This change progressed rapidly under steady-state light exposure, until a saturation point was reached, while the decrease in photoconductivity became significant just after saturation. This suggested that a large-scale photo-structural change was involved in the photo-induced degradation of the electronic properties; in addition to the creation of metastable dangling-bond defects.

K.Shimizu, T.Shiba, T.Tabuchi, H.Okamoto: Japanese Journal of Applied Physics, 1997, 36[1-1A], 29-32