Synthesis and characterization of In2S3: Na thin films prepared by vacuum thermal evaporation technique for photovoltaic applicationsA. Timoumi, H. Bouzouita and B. RezigEur. Phys. J. Appl. Phys., 42 3 (2008) 187-191DOI: https://doi.org/10.1051/epjap:2008073