surface modification of the sno2 layer using uv-ozone in a perovskite solar cell with a planar structure

Tin oxide (sno2) is used as an electron transport layer (etl) in perovskite solar cells with a planarstructure due to its good transparency and energy level alignment with the perovskite layer. the modificationinterface of the electron transport layer and the perovskite absorber layer plays an important role in the efficientcharge extraction process at the interface. in this study, planar perovskite solar cells with configuration(fto/sno2/mixed-cation perovskite/cuins2/au) were prepared to investigate the effect of uv-ozone (uvo) treatedsno2 as etl on the performance of devices. etl treatment was performed at different times (0 to 60 min). it isshown that surface wetting was improved by uvo treating the sno2 films prior to deposition of the perovskite layer.the latter improves the contact between the etl and the perovskite layer, allowing more efficient electron transportat the interface. contact angle, sem, photoluminescence spectra, and the current density-voltage tests wereconducted to characterize the photovoltaic of the cells. the best psc performance with a power conversionefficiency of 10.96% was achieved using uvo-treated sno2 etl for 30 min, whereas the power conversionefficiency of the perovskite solar cells with sno2 etl without uvo treatment was only 4.34%.