1. R. Gay, M. Dietrich, C. Fredric, C. Jensen, K. Knapp, D. Tarrant, D. Willett, Efficiency and process improvements in CuInSe2-based modules, Proceedings of the 12th European Photovoltaic Solar Energy Conference Amsterdam, 1994, p. 935.
2. K. Kushiya, S. Kuriyagawa, T. Kasa, M. Tachiyuki, I. Sugiyama, Y. Satoh, M. Satoh, H. Takeshita, The role of Cu(In,Ga)(S,Se)2 surface layer on a graded band-gap Cu(In,Ga)Se2 thin film solar cell prepared by two-stage method, Proceedings of the 25th IEEE Photovoltaic Specialists Conference, Washington, 1996, p. 989.
3. V. Probst, J. Rimmasch, W. Stetter, H. Harms, W. Riedl, J. Holz, F. Karg, Improved CIS thin film solar cells through novel impurity control techniques, Proceedings of the 13th European Photovoltaic Solar Energy Conference, Nice, 1995, p. 2123.
4. T. Nakada, H. Ohbo, T. Watanabe, H. Nakazawa, M. Matsui, A. Kunioka, Improved Cu(In,Ga)(S,Se)2 Thin-Film Solar Cells by Surface Sulfurization, Proceedings of the Ninth International Photovoltaic Science and Engineering Conference, Miyazaki, 1996, p. 593.
5. Improved Cu(In,Ga)(S,Se)2 thin film solar cells by surface sulfurization