Photodegradation in high-quality hydrogenated amorphous germanium

Photoconductivity of a-Si:H and a-Ge:H: influence of potential fluctuations

“…Note that light-soaked a-Si:H films were used to avoid instability during illumination, i.e., photoconductivity decreases with time (Staebler-Wronski effect) [11]. As a-Ge:H films do not show such instability [12,13], the dc and ac photoconductivities are measured in as-deposited aGe:H films. Fig.…”