Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 2, Pages 392-401Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am100998t
Keywords
intensity modulated photocurrent spectroscopy (IMPS); P3HT:PCBM organic solar cells; organic photovoltaics; organic solar cells; bulk heterojunction; surface and interfacial recombination
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation/Ontario Innovation Trust (CFI/OIT)
- University of Western Ontario
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Intensity modulated. photocurrent (IMPS) and photovoltage (IMVS) spectroscopies were used to study the mechanism of photoprocesses in P3HT:PCBM bulk heterojunction organic solar cells at various light intensities. The use of the frequency domain techniques allowed us to separate the bulk and interfacial processes and gain a valuable insight into the mechanism of losses in these devices. The results provide direct evidence that interfacial nongeminate recombination is one of the dominant loss and, aging mechanisms in bulk heterojunction organic solar cells. The trapping of photoexcited holes in the P3HT phase was found to contribute to the increased recombination rate. The results suggest that promising ways of improving the efficiency of bulk heterojunction solar cells may be reducing the charge trapping both at and near the P3HT:PCBM interface, as well as improving the efficiency of charge extraction at contacts.
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