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Directly probing the origins of this heterogeneity requires characterization with nanoscale spatial resolution, making transmission electron microscopy (TEM) an essential tool. However, characterizing these materials is challenging due to their extreme sensitivity to electron irradiation. Here, we develop a low\u2010dose, concurrent methodology using four\u2010dimensional scanning transmission electron microscopy (4D\u2010STEM) and energy\u2010dispersive x\u2010ray spectroscopy (EDX) in order to map both the chemical and structural architecture of a (FA\n                    <jats:sub>0<\/jats:sub>\n                    .\n                    <jats:sub>83<\/jats:sub>\n                    Cs\n                    <jats:sub>0<\/jats:sub>\n                    .\n                    <jats:sub>17<\/jats:sub>\n                    )Pb(I\n                    <jats:sub>0<\/jats:sub>\n                    .\n                    <jats:sub>8<\/jats:sub>\n                    Br\n                    <jats:sub>0<\/jats:sub>\n                    .\n                    <jats:sub>2<\/jats:sub>\n                    )\n                    <jats:sub>3<\/jats:sub>\n                    perovskite film without inducing damage. Our correlative analysis reveals a complex mosaic of coexisting crystal structures in this state\u2010of\u2010the\u2010art LHP film. We establish a direct link between local chemical composition and crystal structure, showing that the formation of undesirable, photovoltaically inactive hexagonal polytypes is predominantly driven by local deficiencies in the stabilizing cesium cation. These findings provide crucial insight into one of the fundamental origins of structural instabilities in mixed composition perovskite thin\u2010films, suggesting that achieving long\u2010term device performance requires the development of fabrication routes that ensure compositional homogeneity at the nanoscale.\n                  <\/jats:p>","DOI":"10.1002\/adma.74382","type":"journal-article","created":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T09:56:46Z","timestamp":1785491806000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Resolving Nanoscale Heterogeneities in Lead Halide Perovskites Through Low\u2010Dose Concurrent 4D\u2010STEM\u2010EDX Mapping"],"prefix":"10.1002","volume":"38","author":[{"given":"Jinseok","family":"Ryu","sequence":"first","affiliation":[{"name":"electron Physical Science Imaging Centre Diamond Light Source Ltd.  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