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Effect of UV Irradiation and Heat Treatment on the Surface Potential Distribution of Monolayer WS 2 on SiO 2 /Si and Au Substrates
Author(s) -
Han Weipeng,
Qi Junjie,
Li Feng,
Xu Minxuan,
Bai Fan,
Fang Youyin,
Liu Xinxin,
Zhang Yue
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201701083
Subject(s) - materials science , monolayer , annealing (glass) , adsorption , irradiation , substrate (aquarium) , work function , fermi level , desorption , chemical vapor deposition , chemical physics , chemical engineering , analytical chemistry (journal) , nanotechnology , chemistry , layer (electronics) , composite material , physics , oceanography , quantum mechanics , geology , nuclear physics , engineering , electron , chromatography
The surface potential is relevant to work function and Fermi level of materials, which is of great significance to the research of charge transport, carrier concentration, and nanodevices design. Here the effect of UV illumination and heat treatment on the surface potential distribution of chemical vapor deposition grown monolayer WS 2 on SiO 2 /Si and Au substrates is studied statistically. The experimental observation indicates that with the increase in light intensity, the surface potential of WS 2 decreases on SiO 2 /Si substrate, while increases on Au substrate. Heat treatment is introduced to tuning the surface potential of monolayer WS 2 , resulting in the surface potential of WS 2 on SiO 2 /Si substrate decrease and increase on Au substrate after annealing, respectively. The mechanism of the observed phenomenon is discussed in terms of the surface modification of the adsorption/desorption of charges on surface, photoinduced carriers, and charge transfer. This study provides a significant insight into the surface properties and can help optimize the performance of electronic and photonic devices.