Large and rapid light-induced changes were observed in the properties of hydrogenated amorphous films. An absence of concurrent changes in sub-gap absorption or quantum efficiency was inconsistent with the view that the kinetics of degradation amorphous hydrogenated material could be quantified only in terms of neutral dangling bond defects. A self-consistent analysis of the results was achieved by including charged defects and by using a 3-Gaussian distribution of donor-like and acceptor-like defect states.

L.Jiao, H.Liu, S.Semoushikina, Y.Lee, C.R.Wronski: Applied Physics Letters, 1996, 69[24], 3713-5