Synthesis and characterization of new electron-withdrawing moiety thieno[2,3-c]pyrrole-4,6-dione-based molecules for small molecule solar cells
- Authors:
-
- Fu, Lei ;
- Pan, Hongbin ;
-
Larsen-Olsen, Thue Trofod
;
Close
0000-0001-5373-898X
Department of Energy Conversion and Storage, Technical University of Denmark - Andersen, Thomas Rieks ;
-
Bundgaard, Eva
;
Close0000-0003-3244-5779
Department of Energy Conversion and Storage, Technical University of Denmark -
Krebs, Frederik C
;
Close0000-0003-1148-4314
Department of Energy Conversion and Storage, Technical University of Denmark - Chen, Hong-Zheng
- 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
