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Mapping structure heterogeneities and visualizing moisture degradation of perovskite films with nano-focus WAXS.

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Pratap, Shambhavi 
Song, Lin 


Extensive attention has focused on the structure optimization of perovskites, whereas rare research has mapped the structure heterogeneity within mixed hybrid perovskite films. Overlooked aspects include material and structure variations as a function of depth. These depth-dependent local structure heterogeneities dictate their long-term stabilities and efficiencies. Here, we use a nano-focused wide-angle X-ray scattering method for the mapping of film heterogeneities over several micrometers across lateral and vertical directions. The relative variations of characteristic perovskite peak positions show that the top film region bears the tensile strain. Through a texture orientation map of the perovskite (100) peak, we find that the perovskite grains deposited by sequential spray-coating grow along the vertical direction. Moreover, we investigate the moisture-induced degradation products in the perovskite film, and the underlying mechanism for its structure-dependent degradation. The moisture degradation along the lateral direction primarily initiates at the perovskite-air interface and grain boundaries. The tensile strain on the top surface has a profound influence on the moisture degradation.



3403 Macromolecular and Materials Chemistry, 40 Engineering, 34 Chemical Sciences, 3406 Physical Chemistry

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Nat Commun

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Springer Science and Business Media LLC
Deutsche Forschungsgemeinschaft (EXC 2089/1 – 390776260 (e-conversion), International Research Training Group 2022)
Bayerisches Staatsministerium für Bildung und Kultus, Wissenschaft und Kunst (SolTech)
Deutsche Forschungsgemeinschaft (German Research Foundation) (International Research Training Group 2022, EXC 2089/1 - 390776260 (e-conversion))
Bayerisches Staatsministerium für Bildung und Kultus, Wissenschaft und Kunst (State Ministry of Education and Culture, Science and the Arts) (SolTech)