Synthesis and characterization of thieno[3,2-b]thiophene-isoindigo-based copolymers as electron donor and hole transport materials for bulk-heterojunction polymer solar cells
In: Journal of Polymer Science Part A: Polymer Chemistry, Jg. 51 (2012-10-19), S. 424-434
Online
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Zugriff:
A novel class of thieno[3,2-b]thiophene (TT) and isoindigo based copolymers were synthesized and evaluated as electron donor and hole transport materials in bulk-heterojunction polymer solar cells (BHJ PSCs). These π-conjugated donor-acceptor polymers were derived from fused TT and isoindigo structures bridged by thiophene units. The band-gaps and the highest occupied molecular orbital (HOMO) levels of the polymers were tuned using different conjugating lengths of thiophene units on the main chains, providing band-gaps from 1.55 to 1.91 eV and HOMO levels from −5.34 to −5.71 eV, respectively. The corresponding lowest unoccupied molecular orbital (LUMO) levels were appropriately adjusted with the isoindigo units. Conventional BHJ PSCs (ITO/PEDOT:PSS/active layer/interlayer/Al) with an active layer composed of the polymer and PC71BM were fabricated for evaluation. Power conversion efficiency from a low of 1.25% to a high of 4.69% were achieved with the best performing device provided by the D−π−A polymer with a relatively board absorption spectrum, high absorption coefficient, and more uniform blend morphology. These results demonstrate the potential of this class of thieno[3,2-b]thiophene-isoindigo-based polymers as efficient electron donor and hole transport polymers for BHJ PSCs. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
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Synthesis and characterization of thieno[3,2-b]thiophene-isoindigo-based copolymers as electron donor and hole transport materials for bulk-heterojunction polymer solar cells
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Autor/in / Beteiligte Person: | Xu, Xiaofeng ; Hu, Xiao ; Chen, Junwu ; Ng Siu Choon ; Cai, Ping ; Ong, Beng S. ; Lu, Yong ; School of Chemical and Biomedical Engineering ; School of Materials Science & Engineering |
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Zeitschrift: | Journal of Polymer Science Part A: Polymer Chemistry, Jg. 51 (2012-10-19), S. 424-434 |
Veröffentlichung: | Wiley, 2012 |
Medientyp: | unknown |
ISSN: | 0887-624X (print) |
DOI: | 10.1002/pola.26400 |
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