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

POLYMER

卷:105

Article

Lee, Hyo-Sang^1,2  Lee, Joong Suk^3,4  Jung, A-Ra⁵  Cha, Wonsuk^6,7  Kim, Hyunjung⁶  Son, Hae Jung^1,2  Cho, Jeong Ho^3,4  Kim, BongSoo⁵ 

[1] Korea Inst Sci & Technol, Photoelect Hybrids Res Ctr, Seoul 02792, South Korea

[2] Korea Univ, Green Sch, Sch Energy & Environm, Seoul 02841, South Korea

[3] Sungkyunkwan Univ, SKKU Adv Inst Nanotechnol SAINT, Suwon 440746, South Korea

[4] Sungkyunkwan Univ, Ctr Human Interface Nano Technol HINT, Dept Chem Engn, Suwon 440746, South Korea

[5] Ewha Womans Univ, Dept Sci Educ, Seoul 03760, South Korea

[6] Sogang Univ, Dept Phys, Seoul 04107, South Korea

[7] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

关键词: Processing temperature;    Carrier mobility;    Photovoltaic performance;   

DOI  :  10.1016/j.polymer.2016.10.024

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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