期刊
POLYMER
卷 105, 期 -, 页码 79-87出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2016.10.024
关键词
Processing temperature; Carrier mobility; Photovoltaic performance
资金
- National Research Foundation (NRF) - Ministry of Science, ICT & Future Planning [NRF-2015M1A2A2056218]
- Basic Science Research Program through the NRF - Ministry of Education [NRF-2015R1D1A1A01058493]
- R&D Convergence Program of NST (National Research Council of Science & Technology) of Republic of Korea [CAP-15-04-KITECH]
We synthesized a planar pDPPTTi-OD polymer based on diketopyrrolopyrrole (DPP) and thieno [2,3-b] thiophene (TTi) and investigated the electrical properties of the pDPPTTi-OD polymer. pDPPTTi-OD films displayed a low optical bandgap of 1.57 eV, and HOMO and LUMO levels of -5.40 and -3.74 eV, respectively. The 150 degrees C-annealed pDPPTTi-OD films showed a high hole mobility of 0.16 cm(2)V(-1) s(-1) in organic thin-film transistor (OTFT) devices. The photovoltaic properties of polymer solar cells (PSCs) incorporating the pDPPTTi-OD were also measured. A pDPPTTi-OD: PC71BM blend film was spin-coated at 25, 70 and 90 degrees C. High-temperature processing significantly improved the power conversion efficiency of PSCs by effectively reducing the PC71BM domain sizes, which improved the miscibility between pDPPTTi-OD and PC71BM. This work demonstrated that the TTi moiety is a useful donor building block for high-performance D-A type polymers in OTFTs and PSCs, and that processing temperatures should be controlled to fully realize the materials' beneficial intrinsic properties. (C) 2016 Elsevier Ltd. All rights reserved.
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