Menda, Ugur DenebRibeiro, GuilhermeNunes, DanielaCalmeiro, TomásÁguas, HugoFortunato, ElviraMartins, RodrigoMendes, Manuel J.2021-11-262021-11-262021-10-072633-5409PURE: 34379796PURE UUID: c36b7fe9-fe09-4a92-be28-db9df0b25a98Scopus: 85116614626WOS: 000694976800001ORCID: /0000-0002-7374-0726/work/103826590ORCID: /0000-0001-7350-649X/work/103826772ORCID: /0000-0003-3115-6588/work/103826824ORCID: /0000-0002-4202-7047/work/103826837http://hdl.handle.net/10362/128320proposal n1 952169 SFRH/BD/ 151095/2021Lead-halide perovskite solar cells (PSCs) are currently the most promising emergent thin-film photovoltaic technology, having already reached power conversion efficiency (PCE) levels of state-of-the-art wafer-based silicon cells. The class of wide bandgap PSCs has also demonstrated high PCE values, thus becoming highly attractive for top sub-cells in tandem devices constructed with silicon or other types of bottom sub-cells. In this study, wide bandgap double-halide (Cs0.17FA0.83PbI3-xBrx) perovskite absorbers were developed with different bromine content, aiming to obtain bandgap values between 1.66 to 1.74 eV, by a glovebox-free (ambient) procedure. Low-cost inorganic materials, i.e. TiO2 and CuSCN, were used for the electron and hole transport layers, respectively. The 1.70 eV bandgap perovskite resulted in the highest reproducibility and stability (>80% initial PCE after 3500 hours) properties of the PSCs, remarkably attaining 16.4% PCE even with ambient and high humidity (∼70%) fabrication conditions. This journal is124861393engGeneral Materials ScienceChemistry (miscellaneous)SDG 7 - Affordable and Clean Energyjournal article10.1039/d1ma00432hhttps://www.scopus.com/pages/publications/85116614626