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Proceedings Paper

Solar cells based on copolymers of benzothiadiazole and thiophene
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Paper Abstract

The synthesis of conjugated low band-gap copolymers based on thiophene and benzothiadiazole is described. The synthesis was carried out by oxidative ferric chloride polymerization or Stille cross coupling polymerization. The solubility of the polymer based on quarterthiophene and benzothiadiazole was tested with hexyl, 2-ethyl-hexyl and dodecyl as side chains on the thiophene. It was found that 2-ethyl-hexyl substituents gave high molecular weight polymer products with good film forming ability and good solubility. The polymers based on di-thiophene and benzothiadiazole were applied in photovoltaic devices and the coupling of the alkylthiophene showed no effect on the maximum photovoltaic performance. Band-gaps were estimated to be 2 eV for polymers based on di-thiophene and benzothiadiazole and 1.8 eV for polymers based on quarterthiophene and benzothiadiazole. Attempts to synthesize the polymers with a benzo-bis-thiadiazole unit are also described.

Paper Details

Date Published: 3 October 2005
PDF: 12 pages
Proc. SPIE 5938, Organic Photovoltaics VI, 59380Q (3 October 2005); doi: 10.1117/12.613425
Show Author Affiliations
Eva Bundgaard, Risø National Lab. (Denmark)
Roskilde Univ. (Denmark)
Frederik C. Krebs, Risø National Lab. (Denmark)

Published in SPIE Proceedings Vol. 5938:
Organic Photovoltaics VI
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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