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• W2273321167 abstract "Organometal–halide perovskite solar cells have greatly improved in just a few years to a power conversion efficiency exceeding 20%. This technology shows unprecedented promise for terawatt-scale deployment of solar energy because of its low-cost, solution-based processing and earth-abundant materials. We have studied charge separation and transport in perovskite solar cells—which are the fundamental mechanisms of device operation and critical factors for power output—by determining the junction structure across the device using the nanoelectrical characterization technique of Kelvin probe force microscopy. The distribution of electrical potential across both planar and porous devices demonstrates p–n junction structure at the TiO2/perovskite interfaces and minority-carrier diffusion/drift operation of the devices, rather than the operation mechanism of either an excitonic cell or a p-i-n structure. Combining the potential profiling results with solar cell performance parameters measured on optimized and thickened devices, we find that carrier mobility is a main factor that needs to be improved for further gains in efficiency of the perovskite solar cells. Carrier separation and transport in solar cells need to be understood to improve efficiency. Here, Jianget al. study the junction structure in perovskite solar cells using Kelvin probe force microscopy, showing that solar cells have a p–n junction and carrier mobility is a limiting factor for device efficiency improvement." @default.
• W2273321167 created "2016-06-24" @default.
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• W2273321167 date "2015-09-28" @default.
• W2273321167 modified "2023-10-17" @default.
• W2273321167 title "Carrier separation and transport in perovskite solar cells studied by nanometre-scale profiling of electrical potential" @default.
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• W2273321167 doi "https://doi.org/10.1038/ncomms9397" @default.
• W2273321167 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4598624" @default.
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