A New Dithienopyridine-Based Polymer for an Organic Electronics

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Journal of Nanoscience and Nanotechnology, ISSN: 1533-4880, Vol: 17, Issue: 8, Page: 5792-5795

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Sun, Cheng; Song, Seyeong; Song, Hyeng Gun; Park, So Min; Kim, Jin Young; Kim, Yun-Hi; Kwon, Soon-Ki
American Scientific Publishers; AMER SCIENTIFIC PUBLISHERS
Chemical Engineering; Chemistry; Engineering; Materials Science; Physics and Astronomy; Dithienopyridine-Based Copolymer; Mobility; Organic Photovoltaic (OPV); Organic Thin Film Transistor (OTFT); Power Conversion Efficiency
article description
Convergence Technology (RIGET), Gyeongsang National University, Jin-ju, 660-701, Korea Republic of Korea A new dithienopyridine-based copolymer (PDT-TBT) was designed and synthesized. The copolymer showed good solubility in chloroform, chlorobenzene, and dichlorobenzene. The thermogravimetric analysis curve showed that the copolymer had good thermal stability with weight loss of less than 5% at 341 °C. The UV absorption maximum of the polymer appeared at 550 nm in solution and 600 nm in the film. The HOMO and LUMO of the copolymer were -5.50 eV and -3.63 eV, respectively. The copolymer exhibited the best performance when the PC61BM ratio was 1:2 (w/w %), with a JSC of 3.56 mA/cm2, a VOC of 0.45 V, an FF of 0.27%, and a PCE of 0.43%. A thin film transistor with PDT-TBT as the active layer showed mobility of 5.02×10-3 cm2/Vs, an on/off ratio of 1.19×105 and a threshold voltage of -22.75 V.