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Versatile Asymmetric Thiophene/Benzothiophene Flanked Diketopyrrolopyrrole Polymers with Ambipolar Properties for OFETs and OSCs

Abstract

Three novel asymmetric thiophene/benzothiophene-flanked diketopyrrolopyrrole (DPP)-based polymers with different π bridges, designated as PBTTDPP-BT, PBTTDPP-TT and PBTTDPP-2FBT, were designed, synthesized and applied to organic solar cells. Compared with reported thiophene/pyridine-flanked DPP, thiophene/benzothiophene-flanked DPP polymers exhibited narrower band gaps below 1.5 eV, leading to broadened absorptions ranging from 500 nm to 850 nm. All polymers displayed promising ambipolar semiconducting properties. PBTTDPP-BT, PBTTDPP-TT and PBTTDPP-2FBT showed hole mobilities of 1.20, 1.68 and 1.50 cm2V−1s−1, respectively, and their corresponding electron mobilities were 0.40, 0.14 and 0.35 cm2 V−1 s−1. Interestedly, PBTTDPP-TT and PBTTDPP-2FBT also showed ambipolar properties in organic solar cells. Photovoltaic device based on PBTTDPP-TT as donor material reached a power conversion efficiency of 6.96% with PC71BM as an acceptor, while this device as the acceptor material achieved 0.28% with poly(3-hexylthiophene) (P3HT) as a donor. By contrast, PBTTDPP-2FBT-based devices reached 5.62 % with PC71BM and 0.44% with P3HT. These results suggest that adoption of asymmetric flanker DPP polymers can effectively tune the ambipolar transporting properties of these polymers for high-performance organic electronic devices.

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Publication details

The article was received on 07 Jun 2017, accepted on 08 Aug 2017 and first published on 08 Aug 2017


Article type: Paper
DOI: 10.1039/C7PY00940B
Citation: Polym. Chem., 2017, Accepted Manuscript
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    Versatile Asymmetric Thiophene/Benzothiophene Flanked Diketopyrrolopyrrole Polymers with Ambipolar Properties for OFETs and OSCs

    Z. Jiang, Z. Ni, H. Wang, Z. Wang, J. Zhang, G. Qiu, J. Fang, Y. Zhang, H. Dong, K. Lu, W. Hu and Z. Wei, Polym. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7PY00940B

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