Symmetry Engineering Induced In‐Plane Polarization in MoS 2 through Van der Waals Interlayer Coupling

Abstract 2D materials with low‐symmetry exhibit anisotropic physical properties, making them promising candidates for various applications. However, the lack of matured synthesis methods in anisotropic 2D materials is still the main obstacle to their future applications. Given the mature synthesis m...

Full description

Saved in:
Bibliographic Details
Published in:Advanced functional materials 2022-07, Vol.32 (28)
Main Authors: Zheng, Xiaoming, Wei, Yuehua, Zhang, Xiangzhe, Wei, Zhenhua, Luo, Wei, Guo, Xiao, Liu, Jinxin, Peng, Gang, Cai, Weiwei, Huang, Han, Lv, Tieyu, Deng, Chuyun, Zhang, Xueao
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Abstract 2D materials with low‐symmetry exhibit anisotropic physical properties, making them promising candidates for various applications. However, the lack of matured synthesis methods in anisotropic 2D materials is still the main obstacle to their future applications. Given the mature synthesis method of transition metal dichalcogenides (TMDCs), manipulating anisotropy in 2D TMDCs becomes a promising way to tune or trigger functional properties. Herein, for the first time, a van der Waals symmetry engineering is reported to introduce in‐plane polarization in MoS 2 through contact with low‐symmetric CrOCl. The emergence of asymmetric second harmonic generation pattern in MoS 2 /CrOCl heterojunction indicates the variation of lattice symmetry in MoS 2 . Furthermore, the theoretical simulation shows that such change stems from lattice‐mismatch‐induced uniaxial strain because of the strong interlayer interactions. The angle‐dependent Raman and photoluminescence spectra further identify that the uniaxial strain gives rise to the in‐plane polarization in MoS 2 . In addition, the polarized MoS 2 exhibits excellent orientation‐sensitive electrical characteristics with a conductance anisotropy ratio of ≈1.5. More importantly, the strong linear polarization‐sensitive photodetection is realized, and the anisotropic ratio reached 1.25 with 532 nm. The results suggest that symmetric engineering potentially opens up a new field to endow high‐symmetry 2D materials with anisotropic functionalities.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202202658