"Ueno, H.,Jeon, I.,Lin, H.-S.,Thote, A.,Nakagawa, T.,Okada, H.,Izawa, S.,Hiramoto, M.,Daiguji, H.,Maruyama, S.,Matsuo, Y.,Seiichiro Izawa","Li@C60 endohedral fullerene as a supraatomic dopant for C60 electron-transporting layers promoting the efficiency of perovskite solar cells",,"Chemical Communications",,"Vol. 55","No. 79","pp. 11837-11839",2019, "Hiramoto, M.,Kikuchi, M.,Izawa, S.,Seiichiro Izawa","Parts-per-Million-Level Doping Effects in Organic Semiconductor Films and Organic Single Crystals",,"Advanced Materials",,"Vol. 31","No. 1",,2019, "Kikuchi, M.,Makmuang, S.,Izawa, S.,Wongravee, K.,Hiramoto, M.,Seiichiro Izawa","Doped organic single-crystal photovoltaic cells",,"Organic Electronics",,"Vol. 64",,"pp. 92-96",2019, "Kikuchi, M.,Hirota, M.,Kunawong, T.,Shinmura, Y.,Abe, M.,Sadamitsu, Y.,Moh, A.M.,Izawa, S.,Izaki, M.,Naito, H.,Hiramoto, M.,Seiichiro Izawa","Lateral Alternating Donor/Acceptor Multilayered Junction for Organic Solar Cells",,"ACS Applied Energy Materials",,"Vol. 2","No. 3","pp. 2087-2093",2019, "Izawa, S.,Perrot, A.,Lee, J.-H.,Hiramoto, M.,Seiichiro Izawa","Organic pn homojunction solar cell",,"Organic Electronics",,"Vol. 71",,"pp. 45-49",2019, "Kikuchi, M.,Izawa, S.,Rai, N.,Hiramoto, M.,Seiichiro Izawa","Very low activation energy for carrier generation of surface doped organic single crystals observed by Hall effects",,"Applied Physics Letters",,"Vol. 115","No. 11",,2019, "Izawa, S.,Shintaku, N.,Kikuchi, M.,Hiramoto, M.,Seiichiro Izawa","Importance of interfacial crystallinity to reduce open-circuit voltage loss in organic solar cells",,"Applied Physics Letters",,"Vol. 115","No. 15",,2019,