Structural, electrical and photovoltaic properties of CoS/Si heterojunction prepared by spray pyrolysis

Au/p-CoS/n-Si/Al heterojunction device was fabricated by spray pyrolysis technique. The structural and morphological features were examined by x-ray diffraction, scanning electron microscope and energy dispersive x-ray analysis. The capacitance–voltage characteristics of the prepared heterojunction were analyzed at room temperature in the dark. The current–voltage characteristics were examined under dark and different incident light intensities 20–100 mW cm−2. The rectification ratio, series resistance, shunt resistance, diode ideality factor and the effective barrier height were determined at dark and illumination conditions. The photovoltaic parameters such as short circuit current density, open circuit voltage, fill factor and power conversion efficiency were calculated at different incident light intensities.