Keremane, K.S.Prathapani, S.Haur, L.J.Damodaran, D.Vasudeva Adhikari, A.V.Priyadarshi, A.Mhaisalkar, S.G.2026-02-052020Solar Energy, 2020, 199, , pp. 761-7710038092Xhttps://doi.org/10.1016/j.solener.2020.02.063https://idr.nitk.ac.in/handle/123456789/23994The major problem identified in carbon-based mixed cation perovskite solar cells (PSCs) is the selection of a suitable solvent for single-step solution-processed perovskite deposition in order to promote their scalable production. Herein we report a detailed study on the selection of appropriate solvent for the one-step deposition of cesium-formamidinium lead iodide (Cs<inf>0.1</inf>FA<inf>0.9</inf>PbI<inf>3</inf>) perovskite via Lewis acid-base adduct approach for fully printable mesoporous PSCs with mesoporous TiO<inf>2</inf>/ZrO<inf>2</inf>/C architecture. Highly reproducible Cs<inf>0.1</inf>FA<inf>0.9</inf>PbI<inf>3</inf> solar cells were fabricated via adducts of PbI<inf>2</inf> with eco-friendly dimethyl sulfoxide (DMSO). The best cells fabricated with the above approach yielded a photoconversion efficiency (PCE) of 12.33% for a small area device (active area: 0.09 cm2) and 10.1% for a large area device (active area 0.7cm2). The average power conversion efficiency for 62 PSCs was found to be 10.5% under an AM 1.5G illumination. Finally, the mixed cation perovskite in carbon architecture using the Lewis acid-base adduct approach is remarkably stable, with less than 1% change from the initial PCE after 1800h of storage under dark ambient conditions (25 °C, 60–70% RH). © 2020 International Solar Energy SocietyCarbonCesium iodideDepositionDimethyl sulfoxideEfficiencyIodine compoundsLayered semiconductorsOrganic solventsPerovskitePerovskite solar cellsPositive ionsTitanium dioxideZirconium compoundsAmbient conditionsDimethyl sulfoxide (DMSO)Large area devicesLewis acid-basePhotoconversion efficiencyScalable productionSolution-processedSolvent selectionLead compoundscationcesium isotopehalideiodideleadphotochemistrysolar powersolventstorage structure