%0 Journal Article %T Atomistic simulation of light-induced changes in hydrogenated amorphous silicon %A T. A. Abtew %A D. A. Drabold %J Physics %D 2005 %I arXiv %R 10.1088/0953-8984/18/1/L01 %X We employ ab initio molecular dynamics to simulate the response of hydrogenated amorphous silicon to light exposure (Staebler-Wronski effect). We obtain improved microscopic understanding of PV operation, compute the motion of H atoms, and modes of light-induced degradation of photovoltaics. We clarify existing models of light-induced change in aSi:H and show that the Hydrogen collision model of Branz3 is correct in essentials. %U http://arxiv.org/abs/cond-mat/0510818v1