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Xiaochen Wang, Hao Luo, Yeping Sun, Maojie Zhang, Xiaoyu Li, Gui Yu, Yunqi Liu, Yongfang Li and Haiqiao Wang Narrow band gap D–A copolymer of indacenodithiophene and diketopyrrolopyrrole with deep HOMO level: Synthesis and application in field-effect transistors and polymer solar cells Journal of Polymer Science Part A: Polymer Chemistry 50

Article first published online: 31 OCT 2011 | DOI: 10.1002/pola.25042

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A new alternating D-A copolymer, PIDT–DPP, with alkyl substituted indacenodithiophene (IDT) as donor unit, and diketopyrrolopyrrole (DPP) as acceptor unit, was designed and synthesized. The polymer exhibited a broad absorption band from 350 to 900 nm with an absorption peak centered at 735 nm. The highest FET hole mobility of PIDT–DPP reached 0.065 cm2 V−1 s−1 with an on/off ratio of 4.6 × 105. The power conversion efficiency of bulk heterojunction solar cell based on PIDT–DPP was 1.76% with a high open circuit voltage of 0.88 V.

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