Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3202389
Keywords
carrier density; electron-hole recombination; fullerene compounds; organic semiconductors; photoconductivity; photovoltaic effects; polymers; solar cells
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Funding
- Bundesministerium fur Bildung und Forschung [03SF0356B]
- Bavarian Ministry of Economic Affairs, Infrastructure, Transport and Technology
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We performed temperature dependent transient photovoltage and photocurrent measurements on poly(3-hexylthiophene):[6,6]-phenyl-C(61) butyric acid methyl ester bulk heterojuction solar cells. We found a strongly charge carrier concentration and temperature dependent Langevin recombination prefactor. The observed recombination mechanism is discussed in terms of bimolecular recombination. The experimental results were compared with charge carrier extraction by linearly increasing voltage measurements done on the same blend system. We explain the charge carrier dynamics, following an apparent order larger than two, by dynamic trapping of charges in the tail states of the Gaussian density of states.
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