Duong, TheWu, YiLiangShen, HepingPeng, JunWu, NandiWhite, ThomasWeber, KlausCatchpole, Kylie2020-02-18June 10-159781538685297http://hdl.handle.net/1885/201735The stability of perovskite cells has been the major challenge to the commercialization of the technology. Here, we study the thermal stability of mesoporous perovskite cells using poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) for the hole transport layer. We find evidence that gold diffusion into the perovskite active layer is prevented by the PTAA layer when the cell is aged at 85~{mathbf {o}}C in the dark, but not under light. This seriously affects the operational stability of perovskite cells. We therefore develop thermally stable semi-transparent perovskite cells, which retain more than 90% of the initial efficiency after 160 hours operating at 85 {mathbf {o}}\textbf{C} under light.3 pagesapplication/pdfen-AU© 2018 IEEEThermal stability, Aging, Gold, Stability analysis, Photovoltaic cells, Mesoporous materials, Circuit stability201810.1109/PVSC.2018.85481142019-11-25