Nanoscale Photoexcited Carrier Dynamics in Perovskites

Berweger, Samuel; Zhang, Fei; Larson, Bryon W.; Ferguson, Andrew J.; Palmstrom, Axel F.; Reid, Obadiah G.; Wallis, Thomas M.; Zhu, Kai; Berry, Joseph J.; Kabos, Pavel; Nanayakkara, Sanjini U.

doi:10.1021/acs.jpclett.2c00233

Nanoscale Photoexcited Carrier Dynamics in Perovskites

Journal Article · Tue Mar 08 00:00:00 EST 2022 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.2c00233· OSTI ID:1855579

^[1]; Zhang, Fei ^[2]; ^[3]; ^[3]; Palmstrom, Axel F. ^[3]; ^[4]; Wallis, Thomas M. ^[1]; ^[3]; ^[3]; Kabos, Pavel ^[1]; ^[3]

National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Tianjin Univ., Tianjin (China)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States). Renewable and Sustainable Energy Institute (RSEI)

The optoelectronic properties of lead halide perovskite thin films can be tuned through compositional variations and strain, but the associated nanocrystalline structure makes it difficult to untangle the link between composition, processing conditions, and ultimately material properties and degradation. Here, we study the effect of processing conditions and degradation on the local photoconductivity dynamics in [(CsPbI₃)_0.05(FAPbI₃)_0.85(MAPbBr₃)_0.15] and (FA_0.7Cs_0.3PbI₃) perovskite thin films using temporally and spectrally resolved microwave near-field microscopy with a temporal resolution as high as 5 ns and a spatial resolution better than 50 nm. For the latter FACs formulation, we find a clear effect of the process annealing temperature on film morphology, stability, and spatial photoconductivity distribution. After exposure of samples to ambient conditions and illumination, we find spectral evidence of halide segregation-induced degradation below the instrument resolution limit for the mixed halide formulation, while we find a clear spatially inhomogeneous increase in the carrier lifetime for the FACs formulation annealed at 180 degrees C.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1855579

Report Number(s):: NREL/JA-5900-81892; MainId:82665; UUID:193b4a10-2fe0-4254-84ee-0d018c6e7135; MainAdminID:64012

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 10 Vol. 13; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Nanoscale Photoexcited Carrier Dynamics in Perovskites

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