Buckling in thin layer perovskite nanobelts of CsPbBr3 composition

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M.Sc. Candidate Ms. Emma H. Massasa




Flexible semiconductor materials, where structural fluctuations and transformation are tolerable and have low impact on electronic properties, focus interest for future applications. Two dimensional and thin layer lead halide perovskites are hailed for their unconventional optoelectronic features. We report size tunable synthesis of CsPbBr3 nanowires and surprising structural deformation of thin layer buckling in colloidal nanobelts adsorbed on hydrophobic carbon substrates. The microstructure of the buckled nanobelts is determined using transmission electron microscopy (TEM), including selected orientation dark field imaging (SODFI) and tilting experiments. Atomic force near-field microscopy (SNOM-AFM) was used to correlate structure properties with 10nm resolution. By employing plate buckling theory to the data, we approximate adhesion forces between the buckled nanobelt and the substrate. The effect of the buckled perovskite crystal lattice on optoelectronic and other physical properties is still being unveiled. However, the forces and the capillary action leading to the buckling of metal-halide perovskites at the nanoscale, are critical for the design of future devices and heterostructures based on Nano-perovskites.

Advisor: Dr. Yehonadav Bekenstein

The lecture will take place in room 302, Meidan, for green pass holders, or via ZOOM.

Meeting ID: 995 9239 6977

Passcode: mt302m