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However, the uncontrollable volatilization process and the randomly distributed nucleation sites lead to increasingly severe surface roughness and defect formation in the perovskite films as the number of spray\u2010coated layers increases. Here, a solid\u2010phase cyanoacetamide compound, N,N\u2010dimethyl\u20102\u2010cyanoacetamide (DMCA), is employed to induce lattice reorganization on the surface of spray\u2010coated perovskite films. DMCA molecules bearing bifunctional groups enter and intercalate into the perovskite lattice by coordinating their carbonyl groups with Pb\n                    <jats:sup>2+<\/jats:sup>\n                    and forming hydrogen bonds between their cyano groups and formamidinium (FA\n                    <jats:sup>+<\/jats:sup>\n                    ), thereby generating a liquid intermediate state. Upon subsequent heating, DMCA molecules exsolve from the perovskite lattice resulting in lattice reconstruction. Consequently, both surface roughness and defect density are substantially reduced. The optimized wide\u2010bandgap (1.67\u00a0eV) solar cells fabricated via spray\u2010coating method deliver a high open\u2010circuit voltage of 1.23\u00a0V and achieve a record power conversion efficiency (PCE) of 22.56%. Unencapsulated devices exhibit operational stability, maintaining nearly constant efficiency over 1200 h of maximum power point (MPP) tracking under continuous illumination.\n                  <\/jats:p>","DOI":"10.1002\/smll.73482","type":"journal-article","created":{"date-parts":[[2026,4,23]],"date-time":"2026-04-23T12:55:39Z","timestamp":1776948939000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Sublimated Cyanoacetamide\u2010Driven Surface Recrystallization for Spray\u2010Coated Wide\u2010Bandgap Perovskite Solar Cells"],"prefix":"10.1002","volume":"22","author":[{"given":"Qichao","family":"Meng","sequence":"first","affiliation":[{"name":"Institute of Frontier Chemistry School of Chemistry and Chemical Engineering Shandong University  Qingdao China"},{"name":"State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy Qingdao New Energy Shandong Laboratory Qingdao Industrial Energy 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