文摘
Hexagonal β-NaYF<sub>4sub>:Yb<sup>3+sup>, Er<sup>3+sup> nanoprisms, successfully prepared using a hydrothermal method, were incorporated into CH<sub>3sub>NH<sub>3sub>PbI<sub>3sub> perovskite solar cells (PSCs) as an upconverting mesoporous layer. Due to their near-infrared (NIR) sunlight harvesting, the PSCs based on the upconverting mesoporous layer exhibited a power conversion efficiency of 16.0%, an increase of 13.7% compared with conventional TiO<sub>2sub> nanoparticle-based PSCs (14.1%). This result suggests that the hexagonal β-NaYF<sub>4sub>:Yb<sup>3+sup>, Er<sup>3+sup> nanoprisms expand the absorption range of the PSC via upconversion photoluminescence, leading to an enhancement of the photocurrent.