Incorporation of an efficient ?-In2S3 thin film as window material into CdTe photovoltaic devices

Polycrystalline thin film CdS has been used as window material in photovoltaic solar cells. Its ideal band gap (2.45 eV), low resistivity and electron affinity made this material the most used in photovoltaic engineering; However, nowadays a cadmium free material with similar properties is necessary. ?-In2S3 has shown adequate physical properties to be applied on CdTe, CIGS, CIS and CZTS solar cells. ?-In2S3 thin films were grown by chemical bath deposition technique and thermally treated under different conditions. Their structural, optical, morphological and electrical properties were studied, and efficient cadmium free window layer was obtained and implemented on CdTe solar cells. The presented results are discussed.