Characteristics of pulse plated copper gallium telluride films

Copper Gallium Telluride films were deposited for the first time by the pulse electro-deposition technique at different duty cycles in the range of 6–50% at room temperature and at a constant potential of-0.78 V(SCE). The films exhibited single phase copper gallium telluride. The grain size increased with increase of duty cycle. Optical band gap of t h e films varied in the range of 1.235–1.25eV. Atomic force microscopy studies indicated that the grain size and surface roughness vary from 20 nm to 35 nm and 0.8 nm to 1.2 nm, respectively with increase of duty cycle. Capacitance voltage measurements indicated the films to exhibit p-type behavior. The flat band potential was 0.72 V (SCE) and carrier density was in the range of 10¹⁶ cm³.