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CsPbIBr 2 , a cesium-based all-inorganic halide perovskite (CsPe), is a very promising alternative material to mainstream organic-inorganic hybrid halide perovskite (HPe) materials owing to its exceptional moisture stability, thermal stability, and light stability. However, because of the wide band gap (2.05 eV) of CsPbIBr 2 , it has a low power conversion efficiency ( PCE ), which hinders its application in highly efficient solar cells. In this study, a facile nanoimprinted one-dimensional grating nanopattern (1D GNP) formation on mesoporous TiO 2 (mp-TiO 2 ) photoelectrodes was introduced to improve the effective light utilization and enhance the performance of CsPbIBr 2 perovskite solar cells (PSCs). The 1D GNP structure on the mp-TiO 2 layer increases the light absorption efficiency by diffracting the unabsorbed light into the active mp-TiO 2 and CsPbIBr 2 layers as well as increasing the charge separation and collection due to the extended interfacial contact area between the mp-TiO 2 and CsPbIBr 2 layers. Consequently, both the current density ( J SC  ) and the fill factor ( FF ) of the fabricated cells improved, leading to over a 20% enhancement in the solar cell's PCE . Thus, this periodic grating structure, fabricated by simple nanoimprinting, could play an important role in the large-scale production of highly efficient and cost-effective Cs-based PSCs.

Enhanced Light Absorption by Facile Patterning of Nano-Grating on Mesoporous TiO2 Photoelectrode for Cesium Lead Halide Perovskite Solar Cells