Diffusion length of holes in a-Si:H by the surface photovoltage method

Abstract
The diffusion length L for holes in undoped a‐Si:H films has been measured by using a variation of the surface photovoltage method. Values of L in the range 0.33–0.45 μ were found for samples prepared at substrate temperatures Ts = 240 °C and Ts = 330 °C. After prolonged illumination, a reduction to LL was restored after annealing at 200 °C.