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Water‐Induced and Wavelength‐Dependent Light Absorption and Emission Dynamics in Triple‐Cation Halide Perovskites
Author(s) -
Howard John M.,
Palm Kevin J.,
Wang Qiong,
Lee Erica,
Abate Antonio,
Munday Jeremy N.,
Leite Marina S.
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202100710
Subject(s) - materials science , halide , photoluminescence , perovskite (structure) , absorption (acoustics) , wavelength , extinction (optical mineralogy) , molar absorptivity , relative humidity , excitation , analytical chemistry (journal) , optics , optoelectronics , inorganic chemistry , chemistry , crystallography , physics , electrical engineering , chromatography , composite material , thermodynamics , engineering
Metal halide perovskites (MHP) can be made more stable through the addition of small amounts of cesium. Despite the improvement, these multication absorbers still display strong environmental sensitivity to any combination of factors, including water, oxygen, bias, temperature, and light. Here, the relationship is elucidated between light absorption, charge carrier radiative recombination, and relative humidity (rH) for the Cs 0.05 FA 0.79 MA 0.16 Pb(I 0.83 Br 0.17 ) 3 composition, revealing partially reversible reductions in the extinction coefficient and fully reversible 25× enhancements in absolute light emission registered across the same humidity cycles up to 70% rH. With in situ excitation wavelength‐dependent measurements, irreversible changes are identified in the perovskite after a single cycle of humidity‐dependent photoluminescence (PL) performed with 450 nm excitation. The in situ measurement platform can be extended to test the effect of other stressors on thin films’ optical behavior.