Light-induced dangling bonds in hydrogenated amorphous silicon

Abstract
After intensive and long illumination of undoped a‐Si:H samples the dark ESR signal is considerably enhanced. The g value of 2.0055 and the linewidth DHpp = 6–7 G leads to the conclusion that the light‐induced defects are single dangling bonds. They disappear again by thermal anneal at about 220 °C.