Abstract
The CsPbBr3 perovskite solar cells (PSCs) based on carbon counter electrode (CCE) are promising because of the advantages including fabrication simplicity and excellent stability, but their power conversion efficiencies (PCE) are low due to interfacial carrier recombination as the direct contact of the CsPbBr3 with electron transport materials (ETM). In this paper, PbTiO3 shells were grown onto TiO2 nanorods to form PbTiO3-coated TiO2 scaffold layer via a two-step method. The presence of PbTiO3 could promote crystallinity of the CsPbBr3 perovskite film and inhibits interface recombination at the CsPbBr3/TiO2 interface. Consequently, the carbon-based CsPbBr3 solar cells with PbTiO3/TiO2 scaffold layer achieves a high PCE of 7.28%, demonstrating an increase by 19.9% compared with the devices based on TiO2 NRs. Moreover, the champion devices exhibited excellent stability in ambient air, with the PCE value remaining at 93% over 28 days.
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