Dithienogermole As a Fused Electron Donor in Bulk Heterojunction Solar Cells

Dithienogermole As a Fused Electron Donor in Bulk Heterojunction Solar Cells

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...

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Veröffentlicht in:Journal of the American Chemical Society 2011-07, Vol.133 (26), p.10062-10065
Hauptverfasser: Amb, Chad M, Chen, Song, Graham, Kenneth R, Subbiah, Jegadesan, Small, Cephas E, So, Franky, Reynolds, John R
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container_end_page 10065
container_issue 26
container_start_page 10062
container_title Journal of the American Chemical Society
container_volume 133
creator Amb, Chad M
Chen, Song
Graham, Kenneth R
Subbiah, Jegadesan
Small, Cephas E
So, Franky
Reynolds, John R
description 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:PC70BM 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.
doi_str_mv 10.1021/ja204056m
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title Dithienogermole As a Fused Electron Donor in Bulk Heterojunction Solar Cells
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