Directional Laser from Solution-Grown Grating-Patterned Perovskite Single-Crystal Microdisks

摘要

Solution-processed,high-gain,and wavelength-tunable perovskite single-crystal microdisk(PVKsc-MD)lasers have emerged as prospective coherent light sources in advanced nanophotonic designs.However,the inevitable multi-directional emission from a highly symmetrical cavity leads to low light collection efficiency which greatly hinders its application in integrated optical circuits.Here,we report on surface-patterned MAPbBr3 PVKsc-MDs synthesized by a cost-efficient bottom-up solution process employing spin-coating and confined-growth nanoimprinting.The patterned microdisks have high crystal quality with regular shape and sharp edges and nano-grating structure on the upper surface.This straightforward process yields surface-patterned PVKsc-MD lasers with a low lasing threshold and high quality(Q)factor.In addition,the grating structure patterned on the PVKsc-MDs reduces the original symmetry of the laser cavity,which improves the emission directionality four times.