[Abstract]

We synthesize solution processable C60 derivatives, including thien[3,2-b]thienyl C61-butyric acid methyl ester (TThCBM), 5-(2,3,4,6-tetramethoxyphenyl) C61-butyric acid isobutyl ester (TMPCBIB), and selenyl C61-butyric acid methyl ester (SeCBM) and apply those molecules as an electron accepter in bulk-heterojunction organic photovoltaic cell (OPVs) and n-channel semiconducting materials in organic field effect transistors (OFETs). Best OPVs with SeCBM and poly(3-hexylthiophene-2,5-diyl) (P3HT) as the electron acceptor and donor show a slightly improved power conversion efficiency of 4.22% from that of [6,6]-phenyl C61-butyric acid methyl ester (PCBM):P3HT device of 4.0% by improvement of J sc. In addition, a comparable and slightly better electron mobility of 0.5 cm2/Vs is achieved with SeCBM OFETs from PCBM OFETs of 0.4 cm2/Vs.