Conference paper
Low band gap polymers for organic solar cells
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. © (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Language: | English |
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Publisher: | SPIE - International Society for Optical Engineering |
Year: | 2008 |
Proceedings: | SPIE conference on optics and photonics |
Series: | Proceedings of Spie - the International Society for Optical Engineering |
ISSN: | 1996756x and 0277786x |
Types: | Conference paper |
DOI: | 10.1117/12.679012 |
ORCIDs: | Bundgaard, Eva and Krebs, Frederik C |