Out?of?Glovebox Integration of Recyclable Europium?Doped CsPbI ₃ in Triple?Mesoscopic Carbon?Based Solar Cells Exceeding 9% Efficiency

CsPbI3 perovskites are attracting huge interest for their inorganic structure and thanks to a bandgap of 1.69–1.78 eV that makes them suitable application in tandem solar cells with silicon. Herein, all-inorganic hole-transporting-layer (HTL)-free carbon-based perovskite (mC-PSCs) fabricated, the first time, by infiltrating solutions enriched precursors Europium into triple mesoscopic structures mesoporous (mp) materials (mp-TiO2/mp-ZrO2/mp-Carbon). The use is beneficial mitigate lattice defect formation during reaction. Drop casting solution done air black ?-phase promoted under dynamic nitrogen flow high-temperature annealing (350 °C), which preferred low-temperature treatments maximize phase stability. preparation protocol entrusts devices best power conversion efficiencies (PCEs) 9.2% 5.2% using EuI2 EuCl3, respectively. Recorded PCE considerably lower (<2%) reference prepared without Europium. In addition, Eu-based recycled reconvert photo-inactive yellow ?-phase photo-active losing only ?10% efficiency original device. Thus, it demonstrated mC-PSCs recycling feasible exploiting special feature ?-phase-reversibility.