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All Room-Temperature-Processed Carbon-Based Flexible Perovskite Solar Cells with TiO<inf>2</inf> Electron Collection Layer
Journal
Energy Technology
ISSN
21944288
Date Issued
2022-07-01
Author(s)
Kartikay, Purnendu
Yella, Aswani
Mallick, Sudhanshu
Abstract
Herein, low-cost, solution-based, all room-temperature-processed carbon-based triple-cation perovskite solar cells (C-PSC) with TiO2 electron transport layer (ETL) are reported. The hydrothermally synthesized anatase TiO2 nanoparticles with titanium diisopropoxide bis(acetylacetonate) doping results in high-quality and uniform ETL with improved interparticle connectivity. The room-temperature crystallization of pure photoactive α-phase perovskite absorber layer MA0.14FA0.77Cs0.09PbI2.5Br0.5 is achieved with the combination of diethyl ether anti-solvent treatment and nitrogen gas-assisted drying. The resultant film is dense and smooth with pinhole-free uniform grain distribution. The C-PSCs with TiO2 processed at 500 °C give 12.07% efficiency, whereas the room-temperature-processed TiO2 (RT TiO2) ETL-based device shows 10.57% efficiency. Furthermore, this RT TiO2 and room-temperature crystallized perovskite layer are employed in all room-temperature-processed flexible C-PSC with ≈8% efficiency. The fabricated C-PSCs exhibit significant stability for more than 1 month, with a T80 of 335 h.
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