Gap States Distribution of Undoped a-Si: H Determined with Phase-Shift Analysis of the Modulated Photocurrent

Abstract
In order to determine the energy distribution of localized states in the band gap of undoped hydrogenated amorphous silicon, the previously proposed method, i.e. the phase-shift analysis of the modulated photocurrent, is applied to this material. Obtained is the tail states distribution with a bump structure around 0.62 eV below the mobility edge of the conduction band.