Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 6, Issue 8, Pages 337-339Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201206248
Keywords
organic solar cells; conjugated polymers; fullerenes; transient photovoltage; charge extraction; charge carrier recombination
Funding
- Bundesministerium fur Bildung und Forschung [03SF0356B]
- Bavarian Ministry of Economic Affairs, Infrastructure, Transport and Technology
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Transient photovoltage (TPV) and voltage dependent charge extraction (CE) measurements were applied to poly(3-hexyl-thiophene) (P3HT):[6,6]-phenyl-C61 butyric acid methyl ester (PCBM) bulk heterojunction solar cells to analyze the limitations of solar cell performance in pristine and annealed devices. From the determined charge carrier decay rate under open circuit conditions and the voltage dependent charge carrier densities n (V), the nongeminate loss current jloss of the device is accessible. We found that jloss alone is sufficient to describe the j V characteristics across the whole operational range, for annealed and, not yet shown before, also for the lower performing pristine solar cells. Even in a temperature range from 300 K to 200 K nongeminate recombination is found to be the dominant and, therefore, performance limiting loss process. Consequently, charge photogeneration is voltage independent in the voltage range studied. (c) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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