Journal
JOURNAL OF APPLIED PHYSICS
Volume 116, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4892869
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Funding
- NSF IGERT: Materials Creation Training Program (MCTP) [DGE-0654431]
- Molecularly Engineered Energy Materials (MEEM), an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001342]
- ONR [N000141410648]
- NSF [DMR-1210893]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1210893] Funding Source: National Science Foundation
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Recombination through band tail localized states is studied analytically and by measurement of the forward-bias dark current as a function of temperature in three different organic bulk-heterojunction solar cells. The Shockley-Read-Hall mechanism is analyzed for the specific case of recombination between mobile carriers and an exponential distribution of localized band tail states. The analysis gives a simple relation between the dark current ideality factor and the band tail slope. Assumptions of the model are verified by numerical drift-diffusion modeling. Diode current-voltage measurements give good agreement with the analytical model, confirming that the band tail recombination mechanism applies to at least some organic solar cells. Deep traps provide a secondary recombination channel in some devices. (C) 2014 AIP Publishing LLC.
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