Abstract
A new electron deficient monomer, 4,6-bis(5-bromoselenophen-2-yl)-2,5-dioctylpyrrolo[3,4-c]pyrrole-1,3(2H,5H)-dione (SDPPDS), was prepared and co-polymerized with an electron rich distannyl derivative of 4,8-bis(2-ethylhexyloxy) benzo[1,2-b:4,5-b′]dithiophene (BDT) and 4,8-bis(5-(2-ethylhexyl) thiophen-2-yl) benzo[1,2-b:4,5-b′]dithiophene (BDTT) to afford polymers P(BDT-SDPPDS) and P(BDTT-SDPPDS), respectively. The optical band gaps of P(BDT-SDPPDS) and P(BDTT-SDPPDS) were estimated to be 2.03eV and 1.97eV, respectively. The estimated HOMO/LUMO energy levels of P(BDT-SDPPDS) and P(BDTT-SDPPDS) were –5.43eV/–3.43eV and–5.49eV/–3.53eV, respectively. The organic thin film transistor made from the polymers P(BDT-SDPPDS) and P(BDTT-SDPPDS) displayed an impressive hole mobility of 2×10−4cm2/Vs and 1.2×10−3cm2/Vs, respectively. The polymer solar cells (PSC) made with a device structure of ITO/PEDOT:PSS/P(BDT-SDPPDS) or P(BDTT-SDPPDS):PC70BM+3vol% DIO/Ca/Al showed a solar to electrical energy conversion efficiency of 2.26% and 4.45%, respectively.
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