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It is therefore imperative to develop a functional film with antibacterial properties to prevent cross\u2010infection. In this paper, a bilayer thin\u2010film structure composed of iron\u2010doped and copper\u2010doped zinc oxide (Fe\u2010ZnO\/Cu\u2010ZnO) is synthesized through a spin coating technique based on sol\u2010gel. The synergistic effects of metal ion doping, combined with the influence of the internal electric potential, during the photocatalytic reaction process, promote the separation and migration of photogenerated carriers. As a result, it notably boosts the photocatalytic properties. The nanofilm is demonstrated to achieve a rapid bactericidal effect (surpassing 90%) under sunlight irradiation. Furthermore, it is shown to completely kill bacteria after 20 min of illumination and to maintain excellent antibacterial performance (surpassing 90%) for a period of 30 days. Concurrently, the thin film displays both exceptional light transmittance (surpassing 90%) and noteworthy benefits, including environmental sustainability, cost\u2010effectiveness, and the capacity for safe disinfection. The thin film exhibits considerable potential for implementation on surfaces subject to high\u2010frequency public contact. It boasts extensive application prospects and serves as a foundational reference for the design of photocatalytic antibacterial thin films.<\/jats:p>","DOI":"10.1002\/smll.202503536","type":"journal-article","created":{"date-parts":[[2025,7,11]],"date-time":"2025-07-11T06:52:41Z","timestamp":1752216761000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Achieving High Carrier Mobility of Fe\u2010ZnO and Cu\u2010ZnO Laminated Homo\u2010junction Nanofilm for Rapid and Highly Effective Photocatalytic Sterilization"],"prefix":"10.1002","volume":"21","author":[{"given":"Guangrong","family":"Qian","sequence":"first","affiliation":[{"name":"Biomedical Materials Engineering Research Center Hubei Key Laboratory of Polymer Materials Ministry\u2010of\u2010Education Key Laboratory for the Green Preparation and Application of Functional Materials School of Materials Science &amp; Engineering State Key Laboratory of Biocatalysis and Enzyme Engineering Hubei University  Wuhan 430062 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Renyuan","family":"Deng","sequence":"additional","affiliation":[{"name":"Biomedical Materials Engineering Research Center Hubei Key Laboratory of Polymer Materials Ministry\u2010of\u2010Education Key Laboratory for the Green Preparation and Application of Functional Materials School of Materials Science &amp; 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