Double injection as a technique to study charge carrier transport and recombination in bulk-heterojunction solar cells

Ambipolar charge carrier mobility and recombination in bulk-heterojunction solar cells based on the mixture of regioregular poly(3-hexylthiophene) and 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-methanofullerene (PCBM) has been studied using injection current transients. The experimental results demo...

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Bibliographic Details
Published in:Applied physics letters 2005-11, Vol.87 (22)
Main Authors: Juška, G., Arlauskas, K., Sliaužys, G., Pivrikas, A., Mozer, A. J., Sariciftci, N. S., Scharber, M., Österbacka, R.
Format: Article
Language:English
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Summary:Ambipolar charge carrier mobility and recombination in bulk-heterojunction solar cells based on the mixture of regioregular poly(3-hexylthiophene) and 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-methanofullerene (PCBM) has been studied using injection current transients. The experimental results demonstrate double injection with bimolecular recombination limiting the injection current. We found that charge carrier bimolecular recombination is significantly reduced compared to Langevin recombination. We have measured the temperature and electric field dependence of the reduced bimolecular recombination coefficient and the results suggest that the electron and hole pathways are different and the recombination is controlled by the probability of the carriers to meet at the polymer/PCBM interface.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2137454