Ultra-High Vacuum Annealing-Assisted Quantum Wells Dimensional Tailoring for Perovskite Light-Emitting Diodes Efficiency Enhancement

摘要： Quasi-two-dimensional (Q-2D) perovskites featured with multiple dimensional quantum wells (QWs) have been the main candidates for optoelectronic applications. However, the excessive low-dimensional perovskite is unfavorable to the device efficiency due to the phonon-exciton interaction and the inclusion of insulating large organic cation. Herein, the low-dimensional QWs formation is suppressed by removing the organic cation 1-naphthylmethylamine iodide (NMAI) through the ultra-high vacuum (UHV) annealing. The perovskite light-emitting diodes (PLEDs) devices based on films annealed with optimized UHV conditions show higher external quantum efficiency of 13.0% and wall-plug efficiency of 11.1% compared to otherwise identical devices with films annealed in a glovebox.