Media type: E-Article Title: Complex Refractive Indices of Cesium–Formamidinium-Based Mixed-Halide Perovskites with Optical Band Gaps from 1.5 to 1.8 eV Contributor: Werner, Jérémie; Nogay, Gizem; Sahli, Florent; Yang, Terry Chien-Jen; Bräuninger, Matthias; Christmann, Gabriel; Walter, Arnaud; Kamino, Brett A.; Fiala, Peter; Löper, Philipp; Nicolay, Sylvain; Jeangros, Quentin; Niesen, Bjoern; Ballif, Christophe imprint: American Chemical Society (ACS), 2018 Published in: ACS Energy Letters Language: English DOI: 10.1021/acsenergylett.8b00089 ISSN: 2380-8195 Origination: Footnote: