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This has prompted great interest in large\u2010scale production and deployment of perovskite solar cells. However, state\u2010of\u2010the\u2010art perovskite solar cells are fabricated inside gloveboxes and further annealing at high temperatures (typically at &gt;100 \u00b0C for 30 min) is needed. These two required conditions are not compatible with, either in the respect to high\u2010throughput or thermal budget, a feasible industrial production process. By eliminating the two requirements, the deposition of perovskite films both at room temperature and under ambient air condition will make the scalable roll\u2010to\u2010roll fabrication scheme feasible. Here, the anti\u2010solvent (chloroform) washing is introduced to the previously developed hydrochloride\u2010assisted method and demonstrate that the room\u2010temperature method can be carried out under ambient air condition for MAPbI<jats:sub>3<\/jats:sub> film deposition. Through this new procedure, a power conversion efficiency as high as 17.72% is achieved for MAPbI<jats:sub>3<\/jats:sub> planar devices fabricated under a relative humidity of 30% at room temperature. Further, it is revealed that the room\u2010temperature process MAPbI<jats:sub>3<\/jats:sub> films show a near monoexponential decay pathway with a long photoluminescence lifetime of &gt;400 ns.<\/jats:p>","DOI":"10.1002\/smll.201802240","type":"journal-article","created":{"date-parts":[[2018,10,8]],"date-time":"2018-10-08T05:43:18Z","timestamp":1538977398000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Ambient Air Condition for Room\u2010Temperature Deposition of MAPbI<sub>3<\/sub> Films in Highly Efficient Solar Cells"],"prefix":"10.1002","volume":"14","author":[{"given":"Zijiang","family":"Yang","sequence":"first","affiliation":[{"name":"Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University  Beijing 100871 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Molecular Engineering Peking University  Beijing 100871 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dongsheng","family":"Xu","sequence":"additional","affiliation":[{"name":"Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University  Beijing 100871 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