Preparation of CuInSe₂ Thin Films by Chemical Spray Pyrolysis

Abstract

CuInSe 2 thin films have been prepared by chemical spray pyrolysis (CSP) on glass substrate from the ethanol aqueous solution containing CuCl 2 , InCl 3 and N,N-dimethylselenourea. Properlies of the CuInSe 2 films (electrical, structural, optical absorption and morphological properties) have been systematically studied in terms of substrate temperature ( T s ), pH and the ion ratio (Cu/In) of the spray solution. Good chalcopyrite CuInSe 2 films with large grains have been grown using the neutralized spray solution (pH=4) at the growth temperature of 360° C. On the other hand, low values of T s , pH and Cu/In led to the production of sphalerite films.