Adamantyl ligand-induced one-dimensional CsPbBr3 perovskite nanocrystal formation: mechanism and anisotropic photoluminescence

Abstract

Perovskite nanocrystalline materials have good development prospects in the fields of solar cells, photoelectric detection, fluorescent sensors and light-emitting diodes. The morphology regulation of the perovskite nanocrystals plays an important role in their optoelectronic properties. We present a successful and facile synthesis of one-dimensional CsPbBr₃ perovskite nanorods, nanowires, and nanobelts by using a 1-adamantanemethylamine (ADAm) ligand. A systematic experimental investigation in combination with DFT calculations revealed the growth mechanism of the one-dimensional formation of the CsPbBr₃ nanocrystals regulated by ADAm ligands. The CsPbBr₃ NRs grew predominantly along the (011) crystal plane due to the strong adsorption state of ADAm ligands on the (011) plane. The adsorption of ADAm limited the crystal growth along the [011] direction, resulting in anisotropic growth along the [01] direction. The CsPbBr₃ NRs exhibit significant anisotropic photoluminescence (PL), and the highest emission anisotropy value (R) of 0.24 is obtained at its maximum PL peak at 520 nm.