Cu1−xInxSe2 thin films: Deposition by spray pyrolysis and characteristics

► Spray pyrolysis is elegantly used for the synthesis of CuInSe2 films for solar cell applications. ► Depending upon Cu/In ratio, films are Se-deficient or rich. ► The structural studies confirmed polycrystalline chalcopyrite structure of the films. ► Optical band gap decreased continuously with increasing In3+ content in CuSe2. ► Transport studies revealed films to be of both n and p type.