Journal
ACS ENERGY LETTERS
Volume 3, Issue 6, Pages 1402-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00560
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Funding
- National Science Foundation [NSF-DMR-1507803]
- U.S. Department of Energy [DE-AC36-08-GO28308]
- Alliance for Sustainable Energy, LLC
- hybrid perovskite solar cell program - U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1507803] Funding Source: National Science Foundation
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For optoelectronic devices based on polycrystalline semiconducting thin films, carrier transport across grain boundaries is an important process in defining efficiency. Here we employ transient absorption microscopy (TAM) to directly measure carrier transport within and across the boundaries in hybrid organic-inorganic perovskite thin films for solar cell applications with 50 nm spatial precision and 300 fs temporal resolution. By selectively imaging sub-bandgap states, our results show that lateral carrier transport is slowed down by these states at the grain boundaries. However, the long carrier lifetimes allow for efficient transport across the grain boundaries. The carrier diffusion constant is reduced by about a factor of 2 for micron-sized grain samples by the grain boundaries. For grain sizes on the order of 200 nm, carrier transport over multiple grains has been observed within a time window of 5 ns. These observations explain both the shortened photoluminescence lifetimes at the boundaries as well as the seemingly benign nature of the grain boundaries in carrier generation.
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