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Despite such explosive progress, the microscopic origin behind the success of such material is still debated, with the role played by the organic cations in the light-harvesting process remaining unclear. Here van der Waals-corrected density functional theory calculations reveal that the orientation of the organic molecules plays a fundamental role in determining the material electronic properties. For instance, if CH<jats:sub>3<\/jats:sub>NH<jats:sub>3<\/jats:sub> orients along a (011)-like direction, the PbI<jats:sub>6<\/jats:sub> octahedral cage will distort and the bandgap will become indirect. Our results suggest that molecular rotations, with the consequent dynamical change of the band structure, might be at the origin of the slow carrier recombination and the superior conversion efficiency of CH<jats:sub>3<\/jats:sub>NH<jats:sub>3<\/jats:sub>PbI<jats:sub>3<\/jats:sub>.<\/jats:p>","DOI":"10.1038\/ncomms8026","type":"journal-article","created":{"date-parts":[[2015,4,27]],"date-time":"2015-04-27T10:30:24Z","timestamp":1430130624000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":620,"title":["Revealing the role of organic cations in hybrid halide perovskite CH3NH3PbI3"],"prefix":"10.1038","volume":"6","author":[{"given":"Carlo","family":"Motta","sequence":"first","affiliation":[]},{"given":"Fedwa","family":"El-Mellouhi","sequence":"additional","affiliation":[]},{"given":"Sabre","family":"Kais","sequence":"additional","affiliation":[]},{"given":"Nouar","family":"Tabet","sequence":"additional","affiliation":[]},{"given":"Fahhad","family":"Alharbi","sequence":"additional","affiliation":[]},{"given":"Stefano","family":"Sanvito","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2015,4,27]]},"reference":[{"key":"BFncomms8026_CR1","doi-asserted-by":"publisher","first-page":"3623","DOI":"10.1021\/jz4020162","volume":"4","author":"HJ Snaith","year":"2013","unstructured":"Snaith, H. 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