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Dithienogermole As a Fused Electron Donor in Bulk Heterojunction Solar Cells
Abstract
We report the synthesis and bulk heterojunction photovoltaic performance of the first dithienogermole (DTG)-containing conjugated polymer. Stille polycondensation of a distannyl-DTG derivative with 1,3-dibromo-N-octyl-thienopyrrolodione (TPD) results in an alternating copolymer which displays light absorption extending to 735 nm, and a higher HOMO level than the analogous copolymer containing the commonly utilized dithienosilole (DTS) heterocycle. When polyDTG-TPD:PC(70)BM blends are utilized in inverted bulk heterojunction solar cells, the cells display average power conversion efficiencies of 7.3%, compared to 6.6% for the DTS-containing cells prepared in parallel under identical conditions. The performance enhancement is a result of a higher short-circuit current and fill factor in the DTG-containing cells, which comes at the cost of a slightly lower open circuit voltage than for the DTS-based cells.
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Self-citation
Metadata
- Authors
- Amb, C. M., Chen, S., Graham, K. R., Subbiah, J., Small, C. E., So, F., & Reynolds, J. R.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-06-15
- Volume
- 133
- Issue
- 26
- Pages
- 10062-10065
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2006118973
- Cited by
- 702
- References
- 1
- FWCI
- 92.47
- Type
- journal article
- Language
- en
- Open access
- closed
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