High photoconductivity in magnetron sputtered amorphous hydrogenated germanium films

Abstract

Undoped amorphous hydrogenated germanium films which exhibit photoconductivities greater than 10−6 (Ω cm)−1 at a 1.96-eV photon flux of 1015 photons/(cm2 s) with corresponding mobility lifetime products of 10−6 cm2/V have been grown by magnetron sputtering. The films were also characterized by measuring the infrared absorption, the optical obsorption, and the dark conductivity as a function of temperature.