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A solutionprocessed method under air atmosphere is used to prepare the material. The adopted HI\u2010assisted dimethylacetamide (DMA) co\u2010solvent can completely dissolve CuI and BiI<jats:sub>3<\/jats:sub> powders with high concentration compared with other organic solvents. Moreover, the high vapor pressure of tributyl phosphate, selected for the solvent vapor annealing (SVA), enables complete low\u2010temperature (\u226470\u2009\u00b0C) film preparation, resulting in a stable, uniform, dense CuBiI<jats:sub>4<\/jats:sub> film. The average grain size increases with the precursor concentration, greatly improving the photoluminescence lifetime and hall mobility; a carrier lifetime of 3.03\u2005ns as well as an appreciable hall mobility of 110\u2005cm<jats:sup>2<\/jats:sup>\u2009V<jats:sup>\u22121<\/jats:sup>s<jats:sup>\u22121<\/jats:sup> were obtained. XRD illustrates that the crystal structure is cubic (space group <jats:italic>Fd<\/jats:italic>3<jats:italic>m<\/jats:italic>) and favored in the [1\u20091\u20091] direction. Moreover, the photovoltaic performance of CuBiI<jats:sub>4<\/jats:sub> was also investigated. A wide bandgap (2.67\u2005eV) solar cell with 0.82\u2009% power conversion efficiency is presented, which exhibits excellent long\u2010term stability over 1008\u2005h under ambient conditions. This air\u2010stable material may give an application in future tandem solar cells as a stable short\u2010wavelength light absorber.<\/jats:p>","DOI":"10.1002\/cssc.201800815","type":"journal-article","created":{"date-parts":[[2018,6,19]],"date-time":"2018-06-19T10:05:56Z","timestamp":1529402756000},"page":"2930-2935","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":49,"title":["Solution\u2010Processed Air\u2010Stable Copper Bismuth Iodide for Photovoltaics"],"prefix":"10.1002","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7880-4477","authenticated-orcid":false,"given":"Zhaosheng","family":"Hu","sequence":"first","affiliation":[{"name":"Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology  2-4 Hibikino, Waka-matsu-ku Kitakyushu 808-0196 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