Controllable Growth and Optical Properties of CsPbBr₃ Perovskite Micro/Nanostructures by Chemical Vapor Deposition

Zhengxuan Lin; Duan Zhao; Shuai Sun; Xiaofang Lai; Shibin Lei; Jikang Jian

doi:10.6919/ICJE.202505_11(5).0001

Authors

Zhengxuan Lin
Duan Zhao
Shuai Sun
Xiaofang Lai
Shibin Lei
Jikang Jian

DOI:

https://doi.org/10.6919/ICJE.202505_11(5).0001

Keywords:

CsPbBr₃; Chemical Vapor Deposition; Microplates; Microdisks; Nanowires.

Abstract

In this study, perovskite structures with diverse morphologies, including microplates, microdisks and nanowires, were synthesized via chemical vapor deposition. The effects of precursor grinding treatment, precursor quantity, substrate position and reaction temperature on the morphology and dimensions of products were systematically investigated. It demonstrates that when CsBr and PbBr₂ powders were placed in separate crucibles without grinding, microplates with lateral a size of 30 – 60 μm, sharp edges and smooth surfaces were obtained. The size of the microplates increased if the substrate was closer to the precursor source. In contrast, when CsBr and PbBr₂ powders were thoroughly mixed and ground before reaction, the resulting microplates were smaller in size. By adjusting the precursor quantity and grinding treatment, the lateral size and thickness of the microplates could be controlled. By reducing the precursor quantity and placing the substrate farther away from the precursor source, circular microdisks with a plano-convex lens-like morphology were obtained. The microdisks exhibited smooth surfaces, with thickness decreasing gradually from center to edge. They displayed colorful Newton’s ring interference patterns. When the reaction temperature was lowered, simultaneously with a further source-substrate distance, the product morphology transformed into nanowires. The photoluminescence (PL) spectra revealed emission peaks at 520 nm for the microplate, at 519 nm for the microdisk and at 515 nm for the nanowire, exhibiting typical PL peaks of CsPbBr. This study achieved the controllable synthesis of various CsPbBr perovskite micro/nanostructures and analyzed their morphology-property relationship, providing a significant theoretical and experimental foundation for the application of perovskite micro/nanostructures in optoelectronic fields.

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