Growth of Cu2ZnSnSe4 and Cu2FeSnSe4 thin films by AACVD from molecular precursors

Phase pure Cu2ZnSnSe4 (CZTSe) and Cu2FeSnSe4 (CFTSe) thin films have been deposited onto glass substrates by Aerosol Assisted Chemical Vapour Deposition (AACVD) using mixtures of (triphenylphosphine)(tetraphenyldiselenoimidodiphosphinato)copper(I) [Cu(PPh3)[Ph2P(Se)N(Se)PPh2]], tris(2,4-pentanedionato)iron(III) [Fe(acac)3], tin(IV) acetate [Sn(OAc)4] and bis(2,4-pentanedionato)zinc(II) [Zn(acac)2]. Structure, morphology and optical properties of the deposited films were studied. The band gaps of CZTSe and CFTSe films were found to be between 1.0 and 1.2 eV.