Abstract
Electron transport layer (ETL) plays an important role in improving charge transportation, suppressing current-voltage hysteresis and enhancing photovoltaic performance of perovskite solar cells (PSCs). Here we successfully synthesize anatase titania nanoparticles (TiO2 NPs) with an average diameter about 3.6 nm by a facile and low-cost solvothermal method. Using the as-synthesized TiO2 NPs as ETL, the planar perovskite solar cells exhibit good photovoltaic performance. Encouragingly, when the TiO2 NPs are modified with titanium acetylacetonate [TiO(acac)2], a pinhole-free, dense, low charge transfer resistance and high charge extraction TiO2 ETL is formed and the power conversion efficiency of the planar perovskite solar cell is enhanced from 17.25% to 19.21%, accompanied by a significant decrease of J-V hysteresis. The facile process and significant performance improvement suggest that acetylacetonate modified TiO2 nanoparticles could be good ETL candidates for high-performance planar perovskite solar cells with low hysteresis.
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