The suboptimal carrier dynamics at perovskite/electron transport layer has largely limited the further performance enhancement of the state-of-the-art inverted p-i-n structured perovskite solar cells. Herein, we discovered that a simple...

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In this work, the hollow rectangular prism-like TiO 2 (HRP-TiO 2 ) mesocrystals with exposed {001} facets were synthesized via an in-situ hydrothermal process without introducing any additional hydrofluoric acid or fluoride-containing compounds. A double-layer structured photoanode based on HRP-TiO 2 mesocrystals (as the light scattering top layer) and TiO 2 nanocrystalline (TiO 2 -NC, as the underlayer) was constructed. The dye-sensitized solar cell (DSSC) based on the double-layer photoanode showed a remarkable efficiency of 9.16%, which was superior to the pure TiO 2 -NC photoanode-based counterpart (8.19%). The efficiency improvement was attributed to the multiple advantages of HRP-TiO 2 mesocrystals with high crystallinity and superior light scattering capability. More importantly, the anatase phase mesocrystals with exposed {001} facets could provide efficient pathway for electrolyte diffusion and electron transport.