Planar perovskite solar cells (PSCs) have attracted extensive research attention owing to their simple architecture and manufacturing process. Improving the charge extraction ability of the electron transport materials (ETMs) is...
One-dimensional (1D) nanostructured oxides are proposed as excellent electron transport materials (ETMs) for perovskite solar cells (PSCs);however,experimental evidence is lacking. Af acile hydrothermal approach was employed to growh ighly oriented anatase TiO 2 nanopyramid arrays and demonstrate their application in PSCs.T he oriented TiO 2 nanopyramid arrays affordsufficient contact area for electron extraction and increase light transmission. Moreover,t he nanopyramid array/perovskite system exhibits an oriented electric field that can increase charge separation and accelerate charge transport, therebys uppressing charge recombination. The anatase TiO 2 nanopyramid array-based PSCs deliver ac hampion power conversion efficiency of approximately 22.5 %, which is the highest power conversion efficiency reported to date for PSCs consisting of 1D ETMs.T his work demonstrates that the rational design of 1D ETMs can achieve PSCs that perform as well as typical mesoscopic and planar PSCs.
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