Subdiffraction Infrared Imaging of Mixed Cation Perovskites: Probing Local Cation Heterogeneities

Chatterjee, Rusha; Pavlovetc, Ilia M.; Aleshire, Kyle; Hartland, Gregory V.; Kuno, Masaru

doi:10.1021/acsenergylett.7b01306

Title: Subdiffraction Infrared Imaging of Mixed Cation Perovskites: Probing Local Cation Heterogeneities

Journal Article · Thu Jan 25 00:00:00 EST 2018 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.7b01306· OSTI ID:1539539

Chatterjee, Rusha ^[1]; Pavlovetc, Ilia M. ^[1]; Aleshire, Kyle ^[1];

^[1];

^[1]

University of Notre Dame, IN (United States)

Compositional engineering has led to dramatic improvements in hybrid perovskite-based solar cell stabilities and performance. Mixed cation perovskites have emerged as champion photovoltaic materials with power conversion efficiencies exceeding 22%. However, there has been relatively little work done to explore local cation-related compositional inhomogeneities in mixed cation perovskite films. Such studies are necessary since hybrid perovskite optical properties and consequently their photovoltaic performance strongly depend on composition. In this report we perform spatially-resolved, sub-diffraction infrared photothermal heterodyne imaging measurements to probe cation-specific compositional distributions within FA_xMA_1-xPbI₃ perovskite films. Our measurements reveal that these perovskites possess large compositional spatial heterogeneities with cation distributions varying on average ~20% from expected ensemble stoichiometries. Correlated emission measurements show intrafilm emission energies differing by over 30 meV due to these compositional differences. These measurements thus reveal cation stoichiometric heterogeneities and their direct impact on local photovoltaic response-determining optical properties of mixed cation perovskites.

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Research Organization:: University of Notre Dame, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)

Grant/Contract Number:: SC0014334; CHE-1563528; CHE-1502848; W911NF1410604

OSTI ID:: 1539539

Journal Information:: ACS Energy Letters, Vol. 3, Issue 2; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 50 works

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Title: Subdiffraction Infrared Imaging of Mixed Cation Perovskites: Probing Local Cation Heterogeneities

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