@conference {nakamura2014recent, title = {Recent R\&D progress in solar frontier{\textquoteright}s small-sized Cu (InGa)(SeS)2 solar cells}, booktitle = {2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)}, year = {2014}, publisher = {IEEE}, organization = {IEEE}, author = {Nakamura, Motoshi and Yoneyama, Nobutaka and Horiguchi, Kyouhei and Iwata, Yasuaki and Yamaguchi, Koji and Sugimoto, Hiroki and Kato, Takuya} }