The AACVD of Cu2FeSn(SxSe1−x)4: potential environmentally benign solar cell materials

Abstract

Films of Cu₂FeSn(S_xSe_1−x)₄ (CFTSSe) have been deposited by aerosol assisted chemical vapour deposition (AACVD) using mixtures of [Fe(S₂CNEt₂)₃], [Bu₂Sn(S₂CNEt₂)₂] and [Cu(S₂CNEt₂)₂] as precursors for the end member CFTS and of [Cu(PPh₃)(Ph₂P(Se)NP(Se)Ph₂)], [Sn(OAc)₄] and [Fe(acac)₃] for CFTSe. CFTSSe thin films were deposited from [Fe(S₂CNEt₂)₃], [Bu₂Sn(S₂CNEt₂)₂] and [Cu(PPh₃)(Ph₂P(Se)NP(Se)Ph₂)]. The structures, morphologies, compositions, electrical and optical properties of these materials were studied by SEM, XRD, EDX, Raman spectroscopy, electron spectroscopy, UV-Vis measurement and using a four probe conductivity meter.