Ultrafast fabrication of cavity-controlled perovskite-crystallites by a spin-coating method for microlasers

Abstract

In recent years, organic–inorganic hybrid perovskite MAPbBr₃ has exhibited a broad application prospect in light-emitting diode and laser fields due to its excellent characteristics. In particular, single-crystal MAPbBr₃ microdisks can act as resonators and gain media, making them a good candidate for microlasers. In this work, we report a crystallization-manipulated spin-coating method to prepare single-crystal MAPbBr₃ microdisks in several minutes. The NMP additive is used and the ambient humidity is controlled to manipulate the crystallization of MAPbBr₃ microdisks. Attributed to the manipulation of crystallization, the prepared square and octagonal MAPbBr₃ microdisks have regular shapes and smooth end faces, which is beneficial to promoting laser performance. The obtained MAPbBr₃ microdisks can form whispering gallery mode (WGM) lasers and exhibit excellent laser performance with a low laser threshold and a high quality factor (Q). These results demonstrate that the MAPbBr₃ microdisks fabricated by this rapid growth approach could be promising materials for WGM microlasers.