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Understanding and controlling crystallization is crucial for high‐quality perovskite films and efficient solar cells. Herein, the issue of defects in formamidinium lead iodide (FAPbI3) formation is addressed, focusing on the role of intermediates. A comprehensive picture of structural and carrier evolution during crystallization is demonstrated using in situ grazing‐incidence wide‐angle X‐ray scattering,...
Domain walls (DWs) have become an essential component in nanodevices based on ferroic thin films. The domain configuration and DW stability, however, are strongly dependent on the boundary conditions of thin films, which make it difficult to create complex ordered patterns of DWs. Here, it is shown that novel domain structures, that are otherwise unfavorable under the natural boundary conditions,...
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