Urbach tail and optical gap of G D a-Si:H films: Temperature and doping effects

Role of defects in tailoring structural, electrical and optical properties of ZnO

“…The band gap decreases linearly with increase of disorder parameter. This linear dependence has also been observed in SnO 2 films [210] and hydrogenated amorphous silicon [212,213]. This plot indicates that both the width of exponential edge and optical band gap are controlled by the structural and thermal disorder [212].…”