[K-5-2] First principles calculations of defect formation in In-free photovoltaic semiconductors Cu2ZnSnS4 and Cu2ZnSnSe4 T. Maeda1, S. Nakamura1, T. Wada1 (1.Ryukoku Univ. , Japan) https://doi.org/10.7567/SSDM.2010.K-5-2