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Synthesis and characterization of new electron-withdrawing moiety thieno[2,3-c]pyrrole-4,6-dione-based molecules for small molecule solar cells

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Authors:
  • Fu, Lei ;
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    Zhejiang University
  • Pan, Hongbin ;
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    Zhejiang University
  • Larsen-Olsen, Thue Trofod ;
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    Orcid logo0000-0001-5373-898X
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Andersen, Thomas Rieks ;
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    Department of Energy Conversion and Storage, Technical University of Denmark
  • Bundgaard, Eva ;
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    Orcid logo0000-0003-3244-5779
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Krebs, Frederik C ;
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    Orcid logo0000-0003-1148-4314
    Department of Energy Conversion and Storage, Technical University of Denmark
  • Chen, Hong-Zheng
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    Zhejiang University
DOI:
10.1016/j.dyepig.2012.12.009
Abstract:
New conjugated small molecules 5,5′-bis{5-Octyl-2-(2,2′-bithiophen-5-yl)-4H-thieno[2,3-c]pyrrole-4,6-dione}-3,3′-di-octylsilylene-2,2′-bithiophene DTS(BTTPD)2 and 5,5′-bis{5-Octyl-2-(2,5-thiophenyl)-4H-thieno[2,3-c]pyrrole-4,6-dione}-3,3′-di-octylsilylene-2,2′-bithiophene DTS(TTPD)2 of the acceptor–π–donor–π–acceptor type end-capped with thieno[2,3-c]pyrrole-4,6-dione (TPD) units for small molecule solar cells have been prepared through coupling of dithienosilole and TPD units bridged with thienylene and bithienylene. They are soluble in common organic solvents and show an interesting absorption. These small molecules have very similar optical band gaps (1.87 eV and 1.92 eV) and fairly close highest occupied molecular orbital energy levels (−5.52 to −5.55 eV). The best solar cells using DTS(TTPD)2 as an electron donor and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as an electron acceptor demonstrated efficient performance with an obviously high open-circuit voltage (VOC) of 0.97 V and a power conversion efficiency of 1.20% after annealing and using MoO3 as electron-blocking layer. The solar cells based on DTS(BTTPD)2 and PC61BM blend also exhibited a high VOC of 0.97 V under optimized conditions.
Type:
Journal article
Language:
English
Published in:
Dyes and Pigments, 2013, Vol 97, Issue 1, p. 141-147
Keywords:
Conjugated small molecules; Thieno[2,3-c]pyrrole-4,6-dione; New electron-withdrawing moiety; Solution processability; Organic solar cells; Power conversion efficiency
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2013
Scientific Level:
Scientific
ID:
235772214

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