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Molecular Foundry

HIGHLIGHTSAnalysis of strain and defects in Te-WSe2 moiré heterostructures using scanning nanodiffraction
November 21, 2023

Scientific Achievement

(a) Electron nanodiffraction measurement and representative center-of-mass differential phase contrast (CoM-DPC) images illustrating the moiré lattice (b) Overview image of the Te on WSe2 (c)-(f) Strain maps generated from WSe2 and (g)-(j) Te lattices.

Using scanning nanodiffraction revealed precise Te-WSe2 alignment and material imperfections caused by lattice mismatch

Significance and Impact

Insights into Te-WSe2 interactions offer a platform for engineering functional materials and devices at macro and nanoscales through moiré and strain-engineered layered structures emphasizing the pivotal role of defect and strain measurements in refining growth conditions for near-perfect films towards optimization of material performance and advance technological applications of moiré heterostructures.

Research Details

  • Precise determination of moiré structure by matching simulated electron microscopy data to experimental images
  • Scanning nanodiffraction maps nanoscale strain and identifies defects
B. Sari, S.E. Zeltmann, C. Zhao, P.M. Pelz, A. Javey, A.M. Minor, C. Ophus, M.C. Scott, ACS Nano ,Nov. 2023, DOI: 10.1021/acsnano.3c04283

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