"Seiichiro Izawa,Masahiro Hiramoto","Efficient solid-state photon upconversion enabled by triplet formation at an organic semiconductor interface",,"Nature Photonics",,"Vol. 15","No. 12","pp. 895-900",2021,Dec.
"K. Takahashi,S. Izawa,M. Hiramoto,Y.  Nakayama","Quasi-Homoepitaxial Junction of Organic Semiconductors: A Structurally Seamless but Electronically Abrupt Interface between Rubrene and Bis(trifluoromethyl)dimethylrubrene",,"The Journal of Physical Chemistry Letters",,"Vol. 12","No. 46","pp. 11430-11437",2021,Nov.
"J. P. Ithikkal,Y.  Yabara,S. Izawa,S.  Uto,M. Hiramoto","Lateral-tandem organic photovoltaic cells with carrier transport and generation layers",,"Applied Physics Express",,"Vol. 14","No. 10","pp. 101003",2021,Oct.
"Seiichiro Izawa,K.  Uchida,M.  Nakamura,K.  Fujimoto,J.  Roudin,J.  Lee,T.  Inuzuka,T.  Nakamura,M.  Sakamoto,Y.  Nakayama,M. Hiramoto","Influence of            N            �]Substituents on Photovoltaic Properties of Singly Bay�]Linked Dimeric Perylene Diimides",,"Chemistry ? A European Journal",,,,,2021,Sept.
"J. P. Ithikkal,A.  Girault,M.  Kikuchi,Y.  Yabara,S. Izawa,M.  Hiramoto","Photovoltaic behavior of centimeter-long lateral organic junctions",,"Applied Physics Express",,"Vol. 14","No. 9","pp. 094001",2021,Sept.
"Takeuchi, R.,Izawa, S.,Hasegawa, Y.,Tsuruta, R.,Yamaguchi, T.,Meissner, M.,Ideta, S.-I.,Tanaka, K.,Kera, S.,Hiramoto, M.,Nakayama, Y.,Seiichiro Izawa","Experimental Observation of Anisotropic Valence Band Dispersion in Dinaphtho[2,3-b:2�Œ,3�Œ-f]thieno[3,2-b]thiophene (DNTT) Single Crystals",,"Journal of Physical Chemistry C",,,,,2021,
"Fujimoto, K.,Izawa, S.,Takahashi, A.,Inuzuka, T.,Sanada, K.,Sakamoto, M.,Nakayama, Y.,Hiramoto, M.,Takahashi, M.,Seiichiro Izawa","Curved Perylene Diimides Fused with Seven-Membered Rings",,"Chemistry - An Asian Journal",,"Vol. 16","No. 6","pp. 690-695",2021,