Grain Boundary Engineering with Cl-Terminated Ti₂C Quantum Dots for Enhancing Perovskite Solar Cell Performance

Abstract

The power conversion efficiency and stability of polycrystalline perovskite solar cells are compromised by grainboundary-dominated ion migration. Herein, the grain boundaries of CH 3 NH 3 PbI 3 films were engineered using Ti 2 C quantum dots. Ti 2 C quantum dots had a strong interaction with Pb 2+ and I − ions, which retarded crystal growth, resulting in larger grain size and less grain boundary in perovskite films. Additionally, the Ti 2 C quantum dots at the grain boundary could anchor ions and passivate defects, increasing activation energy for ion hopping and reducing trap density. In consequence, perovskite films were used to fabricate solar cells with significantly improved efficiency and stability. These findings may allow the development of versatile grain boundary modifiers for perovskite optoelectronic devices that combine stability and efficiency.

The dawn of MXene duo: revolutionizing perovskite solar cells with MXenes through computational and experimental methods

“…Luo et al used 8 wt% HCl to synthesize Ti 3 C 2 T x quantum dots and explored its effect on halide PSCs. 94 In addition to Ti 3 C 2 T x , researchers have also found the application of a few other MXenes in PSCs. Niu et al have successfully etched Nb 2 CT x MXene by adding the MAX phase into 30 mL of concentrated sulfuric acid and 10 mL of concentrated nitric acid.…”