Jump to main content
Jump to site search


Mechanochemical Synthesis of Inorganic Halide Perovskites: Evolution of Phase-purity, Morphology, and Photoluminescence

Abstract

Dry mechanochemical ball-milling of halide precursor salts is a promising route for the synthesis of high-purity halide perovskites in a fast and solvent-free manner. However, there is a lack of information on the process mechanisms, kinetics, and possible side-effects. Here, we investigated in detail the mechanochemical synthesis of fully-inorganic CsPbBr3 by ball-milling of stoichiometric CsBr and PbBr2. Detailed structural, morphological and optical analyses reveal several beneficial and detrimental effects of milling as a function of time. Three stages are identified during the process: (i) At short milling times (t<5min) different ternary compounds are formed, including stoichiometric CsPbBr3 as well as Cs4PbBr6, and to a lesser extent, CsPb2Br5. Photoluminescence from “nano” and “bulk” CsPbBr3 species is observed, centered at 525 nm and 545 nm, respectively. (ii) At the optimum time (around 5 min for the present case) the complete transformation of all reactants and byproducts into phase-pure CsPbBr3 has occurred. Photoluminescence corresponds to bulk CsPbBr3; (iii) At much longer milling times (up to 10 hours) eventually smaller quantum-confined CsPbBr3 NCs are exfoliated from the bulk product leading to a broad and blue-shifted emission. At this stage the photoluminescence intensity is strongly reduced which is ascribed to the formation of surface defects induced by ball-milling in dry conditions.

Back to tab navigation

Supplementary files

Publication details

The article was received on 12 Jul 2019, accepted on 04 Aug 2019 and first published on 15 Aug 2019


Article type: Communication
DOI: 10.1039/C9TC03778K
J. Mater. Chem. C, 2019, Accepted Manuscript

  •   Request permissions

    Mechanochemical Synthesis of Inorganic Halide Perovskites: Evolution of Phase-purity, Morphology, and Photoluminescence

    F. Palazon, Y. El Ajjouri, P. Sebastia-Luna, S. Lauciello, L. Manna and H. J. Bolink, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC03778K

Search articles by author

Spotlight

Advertisements