Low band gap polymers for organic solar cells

Eva Bundgaard; Frederik C. Krebs

doi:10.1117/12.679012

3 November 2006 Low band gap polymers for organic solar cells

Eva Bundgaard, Frederik C. Krebs

Proceedings Volume 6334, Organic Photovoltaics VII; 63340T (2006) https://doi.org/10.1117/12.679012
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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.

Citation Download Citation

Eva Bundgaard and Frederik C. Krebs "Low band gap polymers for organic solar cells", Proc. SPIE 6334, Organic Photovoltaics VII, 63340T (3 November 2006); https://doi.org/10.1117/12.679012

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