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http://hdl.handle.net/1843/55989| Type: | Artigo de Periódico |
| Title: | Humidity-induced photoluminescence hysteresis in variable Cs/Br ratio hybrid perovskites |
| Authors: | John M. Howard Elizabeth M. Tennyson Sabyasachi Barik Rodrigo Szostak Edo Waks Michael F. Toney Ana Flávia Nogueira Bernardo Ruegger Almeida Neves Marina Soares Leite |
| Abstract: | Hybrid 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. |
| Subject: | Fotoluminescência |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1021/acs.jpclett.8b01357 |
| URI: | http://hdl.handle.net/1843/55989 |
| Issue Date: | 2018 |
| metadata.dc.url.externa: | https://pubs.acs.org/doi/10.1021/acs.jpclett.8b01357 |
| metadata.dc.relation.ispartof: | The Journal of Physical Chemistry Letters |
| Appears in Collections: | Artigo de Periódico |
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