Formation Mechanisms and Phase Stability of Solid-State Grown CsPbI3 Perovskites

Nanomaterials

Pier Carlo Ricci¹  Jessica Satta¹  Daniele Chiriu¹  Carlo Maria Carbonaro¹  Luigi Stagi²  Alberto Casu³ 

[1] Department of Physics, Campus of Monserrato, University of Cagliari, 09042 Monserrato, Italy;Laboratory of Materials Science and Nanotechnology, CR-INSTM, Department of Chemistry and Pharmacy, University of Sassari, Via Vienna 2, 07100 Sassari, Italy;Nabla Lab, Biological and Environmental Sciences and Engineering (BESE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;

关键词: CsPbI₃;    inorganic lead halide perovskites;    solid-state synthesis;    phase stability;   

DOI  :  10.3390/nano11071823

来源: DOAJ

【 摘 要 】

CsPbI₃ inorganic perovskite is synthesized by a solvent-free, solid-state reaction, and its structural and optical properties can be deeply investigated using a multi-technique approach. X-ray Diffraction (XRD) and Raman measurements, optical absorption, steady-time and time-resolved luminescence, as well as High-Resolution Transmission Electron Microscopy (HRTEM) imaging, were exploited to understand phase evolution as a function of synthesis time length. Nanoparticles with multiple, well-defined crystalline domains of different crystalline phases were observed, usually surrounded by a thin, amorphous/out-of-axis shell. By increasing the synthesis time length, in addition to the pure α phase, which was rapidly converted into the δ phase at room temperature, a secondary phase, Cs₄PbI₆, was observed, together with the 715 nm-emitting γ phase.

【 授权许可】

Unknown