Humidity-induced photoluminescence hysteresis in variable Cs/Br ratio hybrid perovskites

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dc.creatorJohn M. Howard
dc.creatorElizabeth M. Tennyson
dc.creatorSabyasachi Barik
dc.creatorRodrigo Szostak
dc.creatorEdo Waks
dc.creatorMichael F. Toney
dc.creatorAna Flávia Nogueira
dc.creatorBernardo Ruegger Almeida Neves
dc.creatorMarina Soares Leite
dc.date.accessioned2023-07-10T13:08:26Z
dc.date.accessioned2025-09-09T01:33:55Z
dc.date.available2023-07-10T13:08:26Z
dc.date.issued2018
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipFAPESP - Fundação de Amparo à Pesquisa do Estado de São Paulo
dc.identifier.doihttps://doi.org/10.1021/acs.jpclett.8b01357
dc.identifier.issn1948-7185
dc.identifier.urihttps://hdl.handle.net/1843/55989
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofThe Journal of Physical Chemistry Letters
dc.rightsAcesso Restrito
dc.subjectFotoluminescência
dc.subject.otherPhotoluminescence
dc.titleHumidity-induced photoluminescence hysteresis in variable Cs/Br ratio hybrid perovskites
dc.typeArtigo de periódico
local.citation.epage3469
local.citation.issue12
local.citation.spage3463
local.citation.volume9
local.description.resumoHybrid organic–inorganic perovskites containing Cs are a promising new material for light-absorbing and light-emitting optoelectronics. However, the impact of environmental conditions on their optical properties is not fully understood. Here, we elucidate and quantify the influence of distinct humidity levels on the charge carrier recombination in CsxFA1–xPb(IyBr1–y)3 perovskites. Using in situ environmental photoluminescence (PL), we temporally and spectrally resolve light emission within a loop of critical relative humidity (rH) levels. Our measurements show that exposure up to 35% rH increases the PL emission for all Cs (10–17%) and Br (17–38%) concentrations investigated here. Spectrally, samples with larger Br concentrations exhibit PL redshift at higher humidity levels, revealing water-driven halide segregation. The compositions considered present hysteresis in their PL intensity upon returning to a low-moisture environment due to partially reversible hydration of the perovskites. Our findings demonstrate that the Cs/Br ratio strongly influences both the spectral stability and extent of light emission hysteresis. We expect our method to become standard when testing the stability of emerging perovskites, including lead-free options, and to be combined with other parameters known for affecting material degradation, e.g., oxygen and temperature.
local.identifier.orcidhttps://orcid.org/0000-0002-3990-5478
local.identifier.orcidhttps://orcid.org/0000-0003-0071-8445
local.identifier.orcidhttps://orcid.org/0000-0002-1819-0266
local.identifier.orcidhttps://orcid.org/0000-0003-0299-0784
local.identifier.orcidhttps://orcid.org/0000-0002-7513-1166
local.identifier.orcidhttps://orcid.org/0000-0002-0838-7962
local.identifier.orcidhttps://orcid.org/0000-0003-0464-4754
local.identifier.orcidhttps://orcid.org/0000-0003-4888-8195
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://pubs.acs.org/doi/10.1021/acs.jpclett.8b01357

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