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Recently, methylammonium\/formamidinium\/cesium triple\u2010cation mixed\u2010halide perovskites have demonstrated efficiencies up to 22\u2009%. Similar to the widely explored methylammonium lead halide, excess PbI<jats:sub>2<\/jats:sub> is added to these perovskite films to enhance their performances. The excess PbI<jats:sub>2<\/jats:sub> is known to be beneficial for the performance. However, its impact on stability is less well known. Triple\u2010cation perovskites deploy excess PbI<jats:sub>2<\/jats:sub> up to 8\u2009%. Thus, it is imperative to analyze the role of excess PbI<jats:sub>2<\/jats:sub> in the degradation kinetics. In this study, the amount of PbI<jats:sub>2<\/jats:sub> in the triple\u2010cation perovskite films is varied and the degradation kinetics monitored by X\u2010ray diffraction and optical absorption spectroscopy. The inclusion of excess PbI<jats:sub>2<\/jats:sub> is shown to adversely affect the stability of the material. Faster degradation kinetics are observed for samples with higher PbI<jats:sub>2<\/jats:sub> contents. However, samples with excess PbI<jats:sub>2<\/jats:sub> also showed superior properties such as enhanced grain sizes and better optical absorption. Thus, careful management of the PbI<jats:sub>2<\/jats:sub> quantity is required to obtain better stability and alternative pathways should be explored to achieve better device performance rather than adding excess PbI<jats:sub>2<\/jats:sub>.<\/jats:p>","DOI":"10.1002\/cssc.201701203","type":"journal-article","created":{"date-parts":[[2017,9,3]],"date-time":"2017-09-03T22:32:37Z","timestamp":1504477957000},"page":"3804-3809","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Effect of Formamidinium\/Cesium Substitution and PbI<sub>2<\/sub> on the Long\u2010Term Stability of Triple\u2010Cation Perovskites"],"prefix":"10.1002","volume":"10","author":[{"given":"Shashwat","family":"Shukla","sequence":"first","affiliation":[{"name":"Energy Research Institute @ NTU (ERIAN) Nanyang Technological University  Singapore Research Techno Plaza, 50 Nanyang Drive 637553 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sudhanshu","family":"Shukla","sequence":"additional","affiliation":[{"name":"Energy Research Institute @ NTU (ERIAN) Nanyang Technological University  Singapore Research Techno Plaza, 50 Nanyang Drive 637553 Singapore"},{"name":"School of Materials Science and Engineering Nanyang Technological University  Singapore Nanyang Avenue 639798 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lew Jia","family":"Haur","sequence":"additional","affiliation":[{"name":"Energy Research Institute @ NTU (ERIAN) Nanyang Technological University  Singapore Research Techno Plaza, 50 Nanyang Drive 637553 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sai S. 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