Measurement of primary photocurrent in hydrogenated amorphous silicon Schottky diode produced by D.C. glow discharge decomposition of silane determines the optical absorption coefficient (α).
The gap state distribution and interface states are investigated from the result of absorption coefficient.
Under illumination of light (6000Å~9000Å, intensity 250 mW/㎠), the absorption coefficient below 1.4 eV is increased and saturated during about 6 hrs illumination.