Tailoring CsPbBr3 Growth via Non-Polar Solvent Choice and Heating Methods

Hediyeh Zamani, Tsung Hsing Chiang, Kaylie R. Klotz, Annie J. Hsu, Mathew M. Maye

Research output: Contribution to journalArticlepeer-review

Abstract

This study describes an investigation of the role of non-polar solvents on the growth of cesium lead halide (CsPbX3 X = Br and I) nanoplatelets. We employed two solvents, benzyl ether (BE) and 1-octadecene (ODE), as well as two nucleation and growth mechanisms, one-pot, facilitated by microwave irradiation (MWI)-based heating, and hot-injection, using convection. Using BE and MWI, large mesoscale CsPbBr3 nanoplatelets were produced, whereas use of ODE produced small crystallites. Differences between the products were observed by optical spectroscopies, which showed first band edge absorptions consistent with thicknesses of ∼9 nm [∼15 monolayer (ML)] for the BE-CsPbBr3 and ∼5 nm (∼9 ML) for ODE-CsPbBr3. Both products had orthorhombic crystal structures, with the BE-CsPbBr3 revealing significant preferred orientation diffraction signals consistent with the asymmetric and two-dimensional platelet morphology. The differences in the final morphology were also observed for products formed via hot injection, with BE-CsPbBr3 showing thinner square platelets with thicknesses of ∼2 ML and ODE-CsPbBr3 showing similar morphologies and small crystallite sizes. To understand the role solvent plays in crystal growth, we studied lead plumbate precursor (PbBrn2-n) formation in both solvents, as well as solvent plus ligand solutions. The findings suggest that BE dissolves PbBr2 salts to a higher degree than ODE, and that this BE to precursor affinity persists during growth.

Original languageEnglish (US)
Pages (from-to)9363-9371
Number of pages9
JournalLangmuir : the ACS journal of surfaces and colloids
Volume38
Issue number30
DOIs
StatePublished - Aug 2 2022

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Fingerprint

Dive into the research topics of 'Tailoring CsPbBr3 Growth via Non-Polar Solvent Choice and Heating Methods'. Together they form a unique fingerprint.

Cite this