New π-extended diketopyrrolopyrrole-based conjugated molecules for solution-processed solar cells: Influence of effective conjugation length on power conversion efficiency

Tae Ryang Hong, Jicheol Shin, Hyun Ah Um, Tae Wan Lee, Min Ju Cho, Gyeong Woo Kim, Jang Hyuk Kwon, Dong Hoon Choi

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 × 10-2 and 1.1 × 10-2 cm2 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%.

Original languageEnglish
Pages (from-to)7-14
Number of pages8
JournalDyes and Pigments
Volume108
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • Bulk heterojunction
  • Diketopyrrolopyrrole
  • Effective conjugation length
  • Organic photovoltaics
  • Organic thin film transistor
  • Power conversion efficiency

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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