Journal
APPLIED PHYSICS LETTERS
Volume 108, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4944044
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Funding
- Helmholtz Energy Alliance for Hybrid Photovoltaics
- Joint Graduate School HyPerCells of the University of Potsdam
- Helmholtz-Zentrum Berlin
- German Science Foundation (DFG) within the priority program Elementary Processes of Organic Photovoltaics (SPP 1355)
- European Union [604032]
- Engineering and Physical Sciences Research Council [EP/G049653/1] Funding Source: researchfish
- EPSRC [EP/G049653/1] Funding Source: UKRI
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Time-delayed collection field experiments are applied to planar organometal halide perovskite (CH3NH3PbI3) based solar cells to investigate charge carrier recombination in a fully working solar cell at the nanosecond to microsecond time scale. Recombination of mobile (extractable) charges is shown to follow second-order recombination dynamics for all fluences and time scales tested. Most importantly, the bimolecular recombination coefficient is found to be time-dependent, with an initial value of ca. 10(-9) cm(3)/s and a progressive reduction within the first tens of nanoseconds. Comparison to the prototypical organic bulk heterojunction device PTB7:PC71BM yields important differences with regard to the mechanism and time scale of free carrier recombination. (C) 2016 AIP Publishing LLC.
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