Seon-Kyoung Son, Yoon-Suk Choi, Woo-Hyung Lee, Yongtaek Hong, Jae-Ryoung Kim, Won-Suk Shin, Sang-Jin Moon, Do-Hoon Hwang and In-Nam Kang
A series of new phenothiazylene vinylene-based semiconducting polymers (P1, P2, and P3) have been synthesized via a Horner-Emmons reaction with weight-averaged molecular weight (Mw) around 22,000–29,000. Solution–processed field-effect transistors fabricated from these polymers showed p-type organic thin-film transistor characteristics. The field-effect mobilities of P1, P2, and P3 were measured to be 1.0 × 10−4, 3.6 × 10−5, and 1.0 × 10−3 cm2 V−1 s−1, respectively, and the on/off ratios were on the order of 102 for P1 and P2, and 103 for P3. The atomic force microscopy images of the polymer thin films revealed that all polymers were characterized by an amorphous structure. A photovoltaic device in which a P3/PC71BM (1/5) blend film was used as the active layer exhibited an open-circuit voltage (VOC) of 0.42 V, a short circuit current (JSC) of 5.17 mA cm−2, a fill factor of 0.35, and a power conversion efficiency of 0.76% under AM 1.5 G (100 mW cm−2) illumination.