Premium
Epitaxial Growth of Rectangle Shape MoS 2 with Highly Aligned Orientation on Twofold Symmetry a‐Plane Sapphire
Author(s) -
Ma Zongpeng,
Wang Shiyao,
Deng Qixin,
Hou Zhufeng,
Zhou Xing,
Li Xiaobo,
Cui Fangfang,
Si Huayan,
Zhai Tianyou,
Xu Hua
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202000596
Subject(s) - materials science , sapphire , epitaxy , chemical vapor deposition , substrate (aquarium) , optoelectronics , photoluminescence , crystallography , anisotropy , fabrication , nanotechnology , chemical physics , condensed matter physics , optics , chemistry , physics , medicine , laser , oceanography , alternative medicine , layer (electronics) , pathology , geology
Research on transition metal dichalcogenides (TMDs) has been accelerated by the development of large‐scale synthesis based on chemical vapor deposition (CVD) growth. However, in most cases, CVD‐grown TMDs are composed of randomly oriented grains, and thus contain many distorted grain boundaries (GBs), which seriously degrade their electrical and photoelectrical properties. Here, the epitaxial growth of highly aligned MoS 2 grains is reported on a twofold symmetry a‐plane sapphire substrate. The obtained MoS 2 grains have an unusual rectangle shape with perfect orientation alignment along the [1‐100] crystallographic direction of a‐plane sapphire. It is found that the growth temperature plays a key role in its orientation alignment and morphology evolution, and high temperature is beneficial to the initial MoS 2 seeds rotate to the favorable orientation configurations. In addition, the photoluminescence quenching of the well‐aligned MoS 2 grains indicates a strong MoS 2 −substrate interaction which induces the anisotropic growth of MoS 2 , and thus brings the formation of rectangle shape grains. Moreover, the well‐aligned MoS 2 grains splice together without GB formation, and thus that has negligible effect on its electrical transport properties. The progress achieved in this work could promote the controlled synthesis of large‐area TMDs single crystal film and the scalable fabrication of high‐performance electronic devices.