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Processing temperature control of a diketopyrrolopyrrole-alt-thieno [2,3-b]thiophene polymer for high-mobility thin-film transistors and polymer solar cells with high open-circuit voltages

Title
Processing temperature control of a diketopyrrolopyrrole-alt-thieno [2,3-b]thiophene polymer for high-mobility thin-film transistors and polymer solar cells with high open-circuit voltages
Authors
Lee, Hyo-SangLee, Joong SukJung, A-RaCha, WonsukKim, HyunjungSon, Hae JungCho, Jeong HoKim, BongSoo
Ewha Authors
김봉수
SCOPUS Author ID
김봉수scopus
Issue Date
2016
Journal Title
POLYMER
ISSN
0032-3861JCR Link1873-2291JCR Link
Citation
vol. 105, pp. 79 - 87
Keywords
Processing temperatureCarrier mobilityPhotovoltaic performance
Publisher
ELSEVIER SCI LTD
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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.
DOI
10.1016/j.polymer.2016.10.024
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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