Reduced Lattice Mismatch at the Interface of Perovskite and LaNiO<sub>3</sub> Hole Transport Layers for Highly Efficient p–i–n Perovskite Solar Cells
Chang Hong Lin, Yihui Zou, Haihua Hu, Ping Lin, Peng Wang, Xiaoping Wu, Lingbo Xu, Can Cui
Abstract
The low hysteresis, good long-term stability, and competitive power conversion efficiency make inverted p–i–n perovskite solar cells (PSCs) a promising architecture for future industrial applications. An essential aspect of achieving high-performance inverted PSCs is the selection and optimization of hole transport layers (HTLs), which are responsible for hole extraction and growth of perovskite films. In this investigation, we utilized a facile hydrothermal method to synthesize LaNiO 3 nanocrystals. The resulting LaNiO 3 nanocrystal dispersion was employed to fabricate LaNiO 3 films as HTLs for the MAPbI 3 PSCs. One noteworthy advantage of this approach is the reduced lattice mismatch between LaNiO 3 and MAPbI 3, which enhances the quality of the LaNiO 3 /MAPbI 3 interface and minimizes microstrain within MAPbI 3 . Consequently, MAPbI 3 PSCs with LaNiO 3 HTLs achieved a remarkable champion efficiency of 19.14%, a low hysteresis index of 0.2%, and an improved stability in air. This study demonstrates that the LaNiO 3 layer is a promising HTL for inverted PSCs.