Abstract
Here we report a UV stable perovskite solar cell with an Fe2O3 ETL made by spin-coating water dispersed Fe3O4 nanoparticles. Devices show nearly no decrease of PCE upon continuous exposure to very high UV light irradiation for 10 hours.
Highlights
UV induced decomposition of perovskite material is one of the main factors to severely destroy perovskite solar cells for instability
Perovskite solar cells with Fe2O3 films could retain less than 5% decreased photoelectric conversion efficiency (PCE) upon continuous 300 W Xe lamp exposure for 10 hours while the TiO2 prepared samples show 30% reduction in PCE
Fe2O3 films with Fe3O4 nanoparticles were prepared by spincoating water-dispersed Fe3O4 nanoparticles with different spin speeds from 3000 to 6000 rpm, different concentrations from 4 mg mlÀ1 to 18 mg mlÀ1 and different sizes from 5 nm to 20 nm
Summary
UV induced decomposition of perovskite material is one of the main factors to severely destroy perovskite solar cells for instability. The best device with nanoparticle prepared solar cells has a PCE of 14.3% which is 185% higher than the device using Fe2O3 ETLs by FeCl3 solution with 7.7% PCE.
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