1. D. Song, J. Xiong, Z. Hu, G. Li, H. Wang, H. An, B. Yu, B. Grenko, K. Borden, K. Sauer, T. Roessler, J. Cui, H. Wang, J. Bultman, A.H. G. Vlooswijk and P. R. Venema, IEEE 38th Photovoltaic Specialists Conference, 2012.
2. T. S. Böscke, D. Kania, A. Helbig, T. Roth, C. Schöllhorn. M. Dupke, P. Sadler, M. Braun, D. Stichtenoth, T. Wütherich, R. Jesswein, D. Fiedler, R. Carl, J. Lossen, and H. J. Krokoszinski, IEEE Journal of Photovoltaics, vol PP, issue 99, 2013, p.1.
3. J. Schmidt and R. Hezel, 12th Workshop on Crystalline Silicon Solar Cell Materials and Processes, 2002.
4. J. Schmidt, A.G. Aberle and R. Hezel, 26th IEEE Photovoltaic Specialist Conference, 1997, p.13.
5. A. Mohr, P. Engelhart, C. Klenke, S. Wanka, A.A. Stekolnikov, M. Scherff, R. Sequin, S. Tardon, T. Ridolph, M. Hofmann, F. Stenzel, J. Lee, S. Diez, J. Wendt, W. Brendle, S. Schmidt, J.W. Müller, P. Wawer, M. Hhofmann, P. Saint-Cast, J. Nekarda, D. Erath, J. Rentsch, R. Preu, Proceedings of the 26th European Photovoltaic Solar Energy Conference, 2011, p.15591.