Dithienogermole as a fused electron donor in bulk heterojunction solar cells

Chad M. Amb, Song Chen, Kenneth R. Graham, Jegadesan Subbiah, Cephas E. Small, Franky So, John R. Reynolds

Research output: Contribution to journalArticlepeer-review

632 Scopus citations


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.

Original languageEnglish
Pages (from-to)10062-10065
Number of pages4
JournalJournal of the American Chemical Society
Issue number26
StatePublished - Jul 6 2011

ASJC Scopus subject areas

  • Catalysis
  • Chemistry (all)
  • Biochemistry
  • Colloid and Surface Chemistry


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