Liquid Knife to Fabricate Patterning Single-Crystalline Perovskite Microplates toward High-Performance Laser Arrays

A facile and effective liquid knife is created by controlling the dewetting process of the liquid precursor, yielding patterning single-crystalline perovskite microplates with uniform size, precise positioning, high quality, and low lasing thresholds. The sizes and location of single-crystalline perovskite are controllable, leading to mode-tunable lasing emission and patterned lasers.