Preparation of CuInSe2 thin films by chemical spray pyrolysis

CuInSe2 thin films have been prepared by chemical spray pyrolysis (CSP) on glass substrate from the ethanol aqueous solution containing CuCl2, InCl3 and N,N-dimethylselenourea. Properlies of the CuInSe2 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 CuInSe2 films with large grains have been grown using the neutralized spray solution (pH = 4) at the growth temperature of 360 degrees C. On the other hand, low values of T-s, pH and Cu/In led to the production of sphalerite films.