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In this study, amorphous dispersible chromium oxide (Cr<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>) nanosheets are synthesized by a facile solvothermal reaction, and a Cr<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> ESL is prepared by spin\u2010coating Cr<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> ink on fluorine\u2010doped tin oxide substrates without need for further annealing. By using Cr<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> as the electron\u2010selective layer and Cs<jats:sub>0.05<\/jats:sub>(MA<jats:sub>0.17<\/jats:sub>FA<jats:sub>0.83<\/jats:sub>)<jats:sub>0.95<\/jats:sub>Pb(I<jats:sub>0.83<\/jats:sub>Br<jats:sub>0.17<\/jats:sub>)<jats:sub>3<\/jats:sub> as the light\u2010absorption layer, a planar hybrid perovskite solar cell is fabricated. The spin\u2010coating speed is optimized, the structure and morphology of samples are observed, the photoelectrical properties of ESLs are characterized, and the photovoltaic behaviors of devices are measured. Results show that the as\u2010prepared Cr<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> layer has high optical transmittance and superb electron extraction and carrier transport property. The planar hybrid PSC based on the optimized Cr<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> ESL achieves a power conversion efficiency of 16.23\u2009%, which is comparable to devices based on a conventional high\u2010temperature\u2010calcined TiO<jats:sub>2<\/jats:sub> ESL. These results demonstrate a low\u2010cost and facile route to highly effective perovskite solar cells.<\/jats:p>","DOI":"10.1002\/cssc.201701864","type":"journal-article","created":{"date-parts":[[2017,12,21]],"date-time":"2017-12-21T00:14:06Z","timestamp":1513815246000},"page":"619-628","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Annealing\u2010Free Cr<sub>2<\/sub>O<sub>3<\/sub> Electron\u2010Selective Layer for Efficient Hybrid Perovskite Solar Cells"],"prefix":"10.1002","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5964-3578","authenticated-orcid":false,"given":"Jia","family":"Dong","sequence":"first","affiliation":[{"name":"Engineering Research Center of Environment-Friendly Functional Materials for Ministry of Education Fujian Provincial Key Laboratory of Photoelectric Functional Materials Institute of Materials Physical Chemistry Huaqiao University  Xiamen 361021 P.R. 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