journal article·2022-07-26

One-Step Growth of Bilayer 2H–1T′ MoTe2 van der Waals Heterostructures with Interlayer-Coupled Resonant Phonon Vibration

Zenglong Guo, Lei Wang, Mengjiao Han, Erding Zhao, Liang Zhu, Weiteng Guo, Junyang Tan, Bilu Liu, Xing-Qiu Chen, Junhao Lin

ACS Nano· Volume 16· Issue 7
Publisher page

Abstract

2H–1T′ MoTe2 van der Waals heterostructures (vdWHs) have promising applications in optoelectronics due to a seamlessly homogeneous semiconductor–metal coupled interface. However, the existing methods to fabricate such vdWHs involved complicated steps that may deteriorate the interfacial coupling and are also lacking precise thickness control capability. Here, a one-step growth method was developed to controllably grow bilayer 2H–1T′ MoTe2 vdWHs in the small growth window overlapped for both phases. Atomic-resolution low-voltage transmission electron microscopy shows the distinct moiré patterns in the bilayer vdWHs, revealing the epitaxial nature of the top 2H phase with the lattice parameters regulated by the underneath 1T′ phase. Such epitaxially stacked bilayer vdWHs modulate the interlayer coupling by resonating their vibration modes, as unveiled by the angle-resolved polarized Raman spectroscopy and first-principles calculations.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Shenzhen Institute for Quantum Science and Engineering (SIQSE), Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China

Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 110016 Shenyang, People’s Republic of China

School of Materials Science and Engineering, University of Science and Technology of China, 110016 Shenyang, People’s Republic of China

Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People’s Republic of China

Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute and Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, People’s Republic of China

Funding

Guangdong Province Introduction of Innovative R&D Team · Science, Technology and Innovation Commission of Shenzhen Municipality · National Natural Science Foundation of China · Special Funds for the Cultivation of Guangdong College Students Special Funds

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