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Here, we mitigate such instabilities and endow strong resistance to antisolvent by incorporating the organometallic compound zinc diethyldithiocarbamate, Zn(DDTC)<jats:sub>2<\/jats:sub>, during the solution\u2010based synthesis of all\u2010inorganic CsSnI<jats:sub>3<\/jats:sub> nanocrystals. Thiourea is shown to form through the thermal\u2010driven conversion of Zn(DDTC)<jats:sub>2<\/jats:sub> during synthesis, which binds to un\u2010passivated Sn sites on the crystal surface and shields it from irreversible oxidation reactions. The CsSnI<jats:sub>3<\/jats:sub> PNCs capped with thiourea show great stability after two purification cycles using methyl acetate, with negligible change in morphology, phase, and optical properties. Moreover, the modified PNCs are resistant to other commonly used antisolvents, like ethyl acetate, 1\u2010pentanol, and isopropanol, offering a platform to explore all\u2010inorganic Sn\u2010based nanocrystalline thin films and optoelectronics.<\/jats:p>","DOI":"10.1002\/smll.202405327","type":"journal-article","created":{"date-parts":[[2024,10,31]],"date-time":"2024-10-31T08:42:26Z","timestamp":1730364146000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Organometallic Compound Stabilizes All\u2010Inorganic Tin\u2010Based Perovskite Nanocrystals Against Antisolvent Post\u2010Treatment"],"prefix":"10.1002","volume":"20","author":[{"given":"Huiyuan","family":"Cheng","sequence":"first","affiliation":[{"name":"Australian Institute for Bioengineering and Nanotechnology The University of Queensland  St Lucia Brisbane QLD 4072 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