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A weak donor/strong acceptor alternating copolymer for efficient bulk heterojunction solar cells
- Issue Date
- Dec-2014
- Publisher
- Elsevier BV
- Keywords
- Organic solar cells; Polymer solar cells; Weak-donor unit; Strong-acceptor unit; Conjugated polymer
- Citation
- Synthetic Metals, v.198, pp 93 - 100
- Pages
- 8
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- Synthetic Metals
- Volume
- 198
- Start Page
- 93
- End Page
- 100
- ISSN
- 0379-6779
- Abstract
- A new alternating copolymer, CO-BDT-DTBT, designed with the "weak donor/strong acceptor" strategy has been synthesized and characterized. This strategy was tested by constructing a library of polymers employing alkanoyloxy-substituted benzodithiophene (BDT) as the weak donor, and benzothiadiazole (BT) as the strong acceptor. CO-BDT-DTBT has a low HOMO energy level of -5.62 eV, and as a result a BHJ device containing CO-BDT-DTBT blended with PC71BM was found to exhibit a high V-OC of 0.88 V. These findings confirm that "weak donor/strong acceptor" polymers are a promising new class of alternating copolymers for polymer solar cell applications. (C) 2014 Elsevier B.V. All rights reserved.
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