"Xianfeng Zhang,Tsuyoshi Kobayashi,Satoshi Oonishi,Yoshiaki Hirai,Yuta Nakajima,Yasuyoshi Kurokawa,Akira Yamada","Progress Towards Realization of Chalcopyrite-Based Tandem Solar Cells","International Symposium on Innovative Solar Cells 2012",,,,,,2012,Mar. "Akira Yamada,Xianfeng Zhang,Satoshi Oonishi,Hiroshi Nagashima,Yukiya Hidaka,Yuta Nakajima,Tsuyoshi Kobayashi,Yoshiaki Hirai,Yasuyoshi Kurokawa","Approaches to realization of Cu(InGa)Se2-based tandem solar cells","International Symposium on Innovative Solar Cells 2010",,,,,,2010,Oct.