Lithium-Based Upconversion Nanoparticles for High Performance Perovskite Solar Cells

In this work, we report an easy, efficient method to synthesize high quality lithium-based upconversion nanoparticles (UCNPs) which combine two promising materials (UCNPs and lithium ions) known to enhance the photovoltaic performance of perovskite solar cells (PSCs). Incorporating the synthesized YLiF4:Yb,Er nanoparticles into the mesoporous layer of the PSCs cells, at a certain doping level, demonstrated a higher power conversion efficiency (PCE) of 19%, additional photocurrent, and a better fill factor (FF) of 82% in comparison to undoped PSCs (PCE = ~16.5%; FF = 71%). The reported results open a new avenue toward efficient PSCs for renewable energy applications.

Automated summary

This work presents an easy and efficient method to synthesize high quality lithium-based upconversion nanoparticles that can enhance the photovoltaic performance of perovskite solar cells. By incorporating these nanoparticles into the mesoporous layer of the cells, a higher power conversion efficiency, additional photocurrent, and a better fill factor were achieved, demonstrating potential for efficient perovskite solar cells in renewable energy applications.