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Implantation of Se2,9 Clusters into WS2 Monolayer to Form Janus Structure

Austin Houston
Department of Materials Science & Engineering, University of Tennessee

This page shows a single cluster impact of Se9 into a WS2 monolayer at 8 eV (top) and 20 eV (bottom). The purpose is to better understand pulsed laser deposition synthesis of the Janus WSSe structure.

This technique has shown success but the mechanics of cluster implantation and diffusion are still not fully understood. PLD cluster sizes vary, typically ranging from 2-9 ions. Experiments have shown that clusters with energies of 1.6 eV soft-land on the surface of the monolayer while those with energies of 20.0 eV destroy the monolayer. Classical molecular dynamics simulations over the same range of cluster sizes and impact energies agrees with the experimental data and reveals some mechanics of single-cluster impact.

Interactive Structures

Color Legend:

  • purple = selenium (Se)
  • light blue = sulfur (S)
  • white = tungsten (W)


[1] Lin, Y.-C., et al. (2020). Low Energy Implantation into Transition-Metal Dichalcogenide Monolayers to Form Janus Structures. ACS Nano 14(4): 3896-3906. [2] You, J., Hossain, M.D. & Luo, Z. Synthesis of 2D transition metal dichalcogenides by chemical vapor deposition with controlled layer number and morphology. Nano Convergence 5, 26 (2018). [3] Geohegan, David B. Time-Resolved Diagnostics of Excimer Laser-Generated Ablation Plasmas Used for Pulsed Laser Deposition. Excimer Lasers, Springer Netherlands, pp. 165 to 85. [4] Mobaraki, A.; Kandemir, A.; Yapicioglu, H.; Gülseren, O.; Sevik, C. Validation of Inter-Atomic Potential for WS2 and WSe2 Crystals through Assessment of Thermal Transport Properties. Computational Materials Science 2018, 144, 92 to 98. [5] Ziegler, J. F.; Biersack, J. P.; Littmark, U. The Stopping and Range of Ions in Matter; Pergamon: New York, 1985. Much thanks to Dr. Eva Zirkadoula for her expertise and guidance. This project would not exist without her support.

posted: May 2022.
updated: May 2022.