Synthesis of 2D Janus and heterostructures by hyperthermal PLD implantation with in situ diagnostics

Kai Xiao; Sumner Harris; Yiling Yu; Yu-Chuan Lin; Austin Houston; Jordan Hachtel; Alexander Puretzky; Christopher Rouleau; Mina Yoon; Gerd Duscher; David Geohegan

doi:10.1117/12.3005378

13 March 2024 Synthesis of 2D Janus and heterostructures by hyperthermal PLD implantation with in situ diagnostics

Kai Xiao, Sumner Harris, Yiling Yu, Yu-Chuan Lin, Austin Houston, Jordan Hachtel, Alexander Puretzky, Christopher Rouleau, Mina Yoon, Gerd Duscher, David Geohegan

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Proceedings Volume PC12874, Nanoscale and Quantum Materials: From Synthesis and Laser Processing to Applications 2024; PC128740I (2024) https://doi.org/10.1117/12.3005378
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

Controlling the stacking and conversion in bilayer crystals and heterostructures by non-equilibrium synthesis and processing is very important to construct 2D moiré quantum materials. Here we will show how to introduce isotopes, laser thinning, and Raman spectroscopy to understand the bilayer growth mechanism in two-step chemical vapor deposition. Then we will describe a feedback approach to reveal and control the transformation pathways in bilayer 2D materials by pulsed laser deposition (PLD). We will focus on the transformation kinetics of bilayer WS2 crystals into Janus WSSe/WS2 and WSe2/WS2 heterostructures by hyperthermal implantation of laser-vaporized Se clusters. In situ ICCD imaging, ion probe, and spectroscopy diagnostics characterize the PLD plasma and are used to precisely control the kinetic energies of the Se species arriving at the substrate. In situ Raman spectroscopy is used to characterize the conversion kinetics and capture the metastable phases during transformation. DFT calculations, XPS, and atomic-resolution HAADF STEM are used to identify the compositions, vibrational modes, and structures for revealing the conversion mechanism of the bilayer crystals.

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Kai Xiao, Sumner Harris, Yiling Yu, Yu-Chuan Lin, Austin Houston, Jordan Hachtel, Alexander Puretzky, Christopher Rouleau, Mina Yoon, Gerd Duscher, and David Geohegan "Synthesis of 2D Janus and heterostructures by hyperthermal PLD implantation with in situ diagnostics", Proc. SPIE PC12874, Nanoscale and Quantum Materials: From Synthesis and Laser Processing to Applications 2024, PC128740I (13 March 2024); https://doi.org/10.1117/12.3005378

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KEYWORDS

Crystals

Quantum processing

Quantum conversion

2D materials

Heterojunctions

Materials science

Raman spectroscopy

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