New pi-extended diketopyrrolopyrrole-based conjugated molecules for solution-processed solar cells: Influence of effective conjugation length on power conversion efficiency
- Authors
- Hong, Tae Ryang; Shin, Jicheol; Um, Hyun Ah; Lee, Tae Wan; Cho, Min Ju; Kim, Gyeong Woo; Kwon, Jang Hyuk; Choi, Dong Hoon
- Issue Date
- 9월-2014
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Diketopyrrolopyrrole; Effective conjugation length; Organic thin film transistor; Organic photovoltaics; Bulk heterojunction; Power conversion efficiency
- Citation
- DYES AND PIGMENTS, v.108, pp.7 - 14
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 108
- Start Page
- 7
- End Page
- 14
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/97483
- DOI
- 10.1016/j.dyepig.2014.04.015
- ISSN
- 0143-7208
- Abstract
- New organic semiconducting molecules containing diketopyrrolopyrrole and thiophene units were designed to investigate the influence of effective conjugation length on the performance of organic photovoltaics made with [6,6]-phenyl-C61-butyric acid methyl ester. New D-A-D-A-D type molecules (where; D = donor, A = acceptor) such as ter- and quarter-thiophene bridged diketopyrrolopyrrole dimers were synthesized with different numbers of conjugative units. The field-effect mobilities of these molecules were determined by fabricating thin film transistors. The new molecules displayed moderately high mobility between 3.6 x 10(-2) and 1.1 x 10(-2) cm(2) V-1 s(-1) without a thermal annealing process for TT(BTDPP)2 and QT(BTDPP)(2). The TT(BTDPP)(2) molecule possesses a longer effective conjugation length (c.f. QT(BTDPP)2) and shows a high carrier mobility. When employing the ter- and quarter-thiophene bridged diketopyrrolopyrrole dimers as donor molecule in combination with [6,6]-phenyl-C61-butyric acid methyl ester [TT(BTDPP)2:PC61BM = 1:0.8 w/w], the photovoltaic cell provides the highest power conversion efficiency of 3.76%. (C) 2014 Elsevier Ltd. All rights reserved.
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