Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.016
Publication date: 11th July 2022
Quantifying the role of extrinsic (humidity and oxygen) and intrinsic (light, bias, and temperature) environmental stressors on the degradation of halide perovskites is key for the further development of stable optoelectronic devices. In this talk, I will present a suite of optical and electrical complementary tools that provide a detailed description of the dynamic responses within these materials, from the macro to the nanoscale. At the macroscopic scale, we unravel the influence of relative humidity on charge carrier radiative recombination in CsxFA1−xPb(IyBr1−y)3 perovskites through in situ PL, where we temporally and spectrally measure light emission within loops of critical relative humidity (rH) levels. Then, we apply machine learning algorithms to forecast the material optical response once exposed to distinct temperature and humidity levels. At the nanoscale, we realize state-of-the-art scanning probe microscopy methods to image and quantify ion motion within and between grains, as a function of illumination and relative humidity. Combined, the macro- and nanoscale environmental measurements performed provide an ample framework for tracking, in real-time, the relevant changes that can lead to degradation. Additionally, they exemplify trustworthy diagnosis tools that can be expanded to any perovskite chemical composition.
National Science Foundation (ECCS, award 2023974); Sandia National Laboratory
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