Humidity-Induced Photoluminescence Hysteresis in Variable Cs/Br Ratio Hybrid Perovskites
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- Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering. Inst. for Research in Electronics and Applied Physics
- Univ. of Maryland, College Park, MD (United States). Inst. for Research in Electronics and Applied Physics. Dept. of Physics
- Univ. of Campinas (Brazil). Inst. of Chemistry
- Univ. of Maryland, College Park, MD (United States). Inst. for Research in Electronics and Applied Physics. Dept. of Electrical and Computer Engineering
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource; Univ. of Campinas (Brazil). Inst. of Chemistry
- Univ. of Maryland, College Park, MD (United States). Inst. for Research in Electronics and Applied Physics; Federal Univ. of Minas Gerais, Belo Horizonte (Brazil). Dept. of Physics
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. In this paper, 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. Finally, 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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Maryland, College Park, MD (United States); Univ. of Campinas (Brazil)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); São Paulo Research Foundation (FAPESP) (Brazil)
- Grant/Contract Number:
- AC02-76SF00515; 16-10833; 2017/12582-5; 2015/50450-8
- OSTI ID:
- 1469619
- Journal Information:
- Journal of Physical Chemistry Letters, Vol. 9, Issue 12; ISSN 1948-7185
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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