Multiple Regulation over Growth Direction, Band Structure, and Dimension of Monolayer WS2 by a Quartz Substrate

Wang, Jingwei1,2; Luo, Yi3; Cai, Xiangbin2; Shi, Run1,2; Wang, Weijun1; Li, Tianran1; Wu, Zefei2; Zhang, Xian1; Peng, Ouwen1; Amini, Abbas4; Tang, Chunmei3; Liu, Kai5; Wang, Ning2; Cheng, Chun1

2020-03-24

10.1021/acs.chemmater.9b05124

CHEMISTRY OF MATERIALS   影响因子和分区

0897-4756

1520-5002

A substrate plays a crucial role in controlled growth and property modulation of two-dimensional (2D) transition-metal dichalcogenides (TMDCs). In this work, we report multiple regulation over growth direction, band structure, and dimension of an epitaxial monolayer (1L) WS2 by an m-plane quartz substrate. The as-grown WS2 is oriented on a 2-fold symmetric m-quartz based on an anisotropic lattice match, which is distinct from that on c-sapphire. Owing to the large thermal expansion coefficient, the m-quartz generates a large compressive thermal strain in the as-grown WS2. By manipulating this thermal strain, the band structure of 1L-WS2 can be in situ regulated and a direct-indirect band gap transition occurs when the thermal strain exceeds 0.5%. Moreover, the unique atom distribution of the m-plane quartz established an anisotropic diffusion barrier for adlayer monomers which restricted the growth of WS2 uniaxially. By exploiting this, the dimension of WS2 can be tailored from a 2D triangle to a one-dimensional ribbon with controlled growth time. This work not only deepens the understanding of the relationship between a substrate and a material but also provides an effective way to directly regulate the as-grown TMDCs with desirable structures and properties.

SCI ; EI

英语

第一 ; 通讯

Training Program for Outstanding Young Teachers at Higher Education Institutions of Guangdong Province[YQ2015151]

Chemistry ; Materials Science

Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:000526391300031

AMER CHEMICAL SOC

20201508387866

Quartz ; Sapphire ; Energy gap ; Anisotropy ; Monolayers ; Thermal expansion ; Transition metals

Minerals:482.2 ; Gems:482.2.1 ; Metallurgy and Metallography:531 ; Thermodynamics:641.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol SUSTech, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong 999077, Peoples R China
3.Hohai Univ, Coll Sci, Nanjing 210098, Peoples R China
4.Western Sydney Univ, Ctr Infrastruct Engn, Kingswood, NSW 2751, Australia
5.Tsinghua Univ, Minist Educ, Sch Mat Sci & Engn, Key Lab Adv Mat, Beijing 100084, Peoples R China

Wang, Jingwei,Luo, Yi,Cai, Xiangbin,et al. Multiple Regulation over Growth Direction, Band Structure, and Dimension of Monolayer WS2 by a Quartz Substrate[J]. CHEMISTRY OF MATERIALS,2020,32(6):2508-2517.

Wang, Jingwei.,Luo, Yi.,Cai, Xiangbin.,Shi, Run.,Wang, Weijun.,...&Cheng, Chun.(2020).Multiple Regulation over Growth Direction, Band Structure, and Dimension of Monolayer WS2 by a Quartz Substrate.CHEMISTRY OF MATERIALS,32(6),2508-2517.

Wang, Jingwei,et al."Multiple Regulation over Growth Direction, Band Structure, and Dimension of Monolayer WS2 by a Quartz Substrate".CHEMISTRY OF MATERIALS 32.6(2020):2508-2517.