Xiaomin Xu, Kenjiro Fukuda, Akchheta Karki, Sungjun Park, Hiroki Kimura, Hiroaki Jinno, Nobuhiro Watanabe, Shuhei Yamamoto, Satoru Shimomura, Daisuke Kitazawa, Tomoyuki Yokota, Shinjiro Umezu, Thuc-Quyen Nguyen, Takao Someya,"Thermally stable, highly efficient, ultraflexible organic photovoltaics",Proceedings of the National Academy of Sciences,Volume 115,Issue 18,pp.4589-4594,DOI:10.1073/pnas.18011871152018.05.01