DOI: https://doi.org/10.29363/nanoge.hpatom.2022.017
Publication date: 30th October 2021
Hybrid halide perovskites have drawn significant attention due to their outstanding photovoltaic capabilities. However, these materials exhibit poor environmental stability with respect to moisture, light, and temperature, which limits the performance of solar cells. We demonstrate moisture-induced degradation in the state-of-the-art triple cation mixed halide (Cs0.05(MA0.17FA0.83)0.95Pb(Br0.17I0.83)3). Exposing this material at 85% relative humidity (RH) leads to degradation via two competitive pathways: (i) irreversible phase-segregation to form CsPb2Br5 and a cesium-poor/iodide rich Cs0.05-x(MA0.17FA0.83)0.95Pb(Br0.17-2yI0.83+2y)3 phase and (ii) PbI2 formation via dissolution/recrystallization mechanism. Multi-technique approach utilized in this work facilitates the understanding of this process as aged material consists of crystalline CsPb2Br5 and PbI2 phases that can be characterized using in situ X-ray diffraction and in situ live liquid cell transmission electron microscopy, whereas insights into the local environments of organic as well as inorganic cations are provided by ex-situ 1D/2D solid-state NMR spectroscopy of protons and 133Cs spin-7/2 isotope. Optical spectroscopic techniques, such as photoluminescence (PL) and fluorescence lifetime imaging microscopy, further elucidate the heterogeneities in terms of morphology, PL intensities, and PL lifetimes upon exposure to moisture (85% RH). These results provide new insights into the degradation pathways of this complex yet high-performing composition.
This work has received financial support from Région Hauts-de-France, FEDER, and Electricité de France
(EDF) through PEROVSTAB program. We thank the electronic microscopy platform of UPJV for access to SEM and TEM microscopes. Dr. Anurag Krishna (LRCS and EPFL), Dr. Sebastien Gottis (LRCS), and Dr. Jean-Noel Chotard (LRCS) is acknowledged for fruitful discussions. M.A.A.K and F.S. gratefully acknowledge the financial support from the IR-RMN-THC FR-3050 CNRS France for conducting solid- state NMR measurements. P.R. and G.N.M.R. acknowledge the financial support from University of Lille and région Hauts-de-France. F.S. acknowledges “IMPRESSIVE” project which received funding from the European Union’s Horizon2020 research and innovation program under grant agreement number N° 826013.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.