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Proceedings Paper

Low band gap polymers for organic solar cells
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Paper Abstract

The synthesis of copolymers based on thiophene, benzothiadiazole and benzo-bis-thiadiazole are described. The polymers were obtained by employing Stille cross coupling polymerization. The polymers were characterized by NMR, size exclusion chromatography, UV-vis and ultraviolet photoelectron spectroscopy. The results obtained from UV-vis and ultraviolet photoelectron spectroscopy showed band gaps of 2.1-1.7 eV for polymers based on benzothiadiazole and 0.7 eV for polymers based on benzo-bis-thiadiazole. Furthermore the results showed that the band gap decreases with an increase in the number, n, of thiophenes in the polymer repeating unit (n= 1-4). Large area photovoltaic devices were prepared and the results of these devices are described.

Paper Details

Date Published: 3 November 2006
PDF: 10 pages
Proc. SPIE 6334, Organic Photovoltaics VII, 63340T (3 November 2006); doi: 10.1117/12.679012
Show Author Affiliations
Eva Bundgaard, Risø National Lab. (Denmark)
Roskilde Univ. (Denmark)
Frederik C. Krebs, Risø National Lab. (Denmark)


Published in SPIE Proceedings Vol. 6334:
Organic Photovoltaics VII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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