基于简单液相法对单层二硒化钨表面电荷掺杂的研究

doi:10.11896/cldb.19040141

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Abstract In this paper, we report a very facile and easy method to achieve electronic doping monolayer WSe₂ efficiently. A mass fraction of 40% (NH₄)₂SO₄ solution at a relatively low temperature can realize the n-type doping of WSe₂, while, the 98% H₂SO₄ gives rise to the p-type doping of WSe₂. It is found that the monolayer WSe₂ can keep its crystal structure stable up to as high as 140 ℃ in (NH₄)₂SO₄ solution to approach the maximum doping effect. Both n-type and p-type doping of monolayer WSe₂ are reversible by putting the samples in vacuum and followed by cleaning in ultrapure water. And the samples p-doping effects can be significantly enhanced by two-step reaction, which is n-doping in (NH₄)₂SO₄ solution firstly and then followed by p-doping in H₂SO₄. Therefore, modulate the electronic doping of monolayer WSe₂ effectively not only demonstrates a simple way to tune its photoluminescence properties, but also of great importance to guide the design of WSe₂-based flexible electronic device.

Key words： monolayer WSe₂ charge doping photoluminescence Fermi surface thermal stability

Published: 29 May 2020

CLC number:

TB34

Fund:This work was financially supported by the Natural Science Foundation of Fujian Province, China (2017J01005), China Postdoctoral Science Foundation (2017M612133).

About author:: Shuxian Di studied at the College of Materials and Research Institute for Soft Matter and Biomimetics, Xiamen University, Fujian Province from September 2016 to June 2019. She focused on the research of the doping effects on two-dimensional materails' optical properties. She received her master of science degree in June 2019 from Xiamen University.
Da Zhan received his Ph.D. degree in physics and applied physics from Nanyang Technological University in 2013. He is currently an associate professor in the College of Materials and Research Institute for Soft Matter and Biomimetics, Xiamen University. His main research interests are detecting the electronic band structure of two-dimensional electronic materials through the characteristics of biomolecules, including potential biosensing applications.

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	DI Shuxian
	LAI Yongjue
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	LIN Naibo
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Cite this article:

DI Shuxian,LAI Yongjue,QIU Wu, et al. Investigation of Surface Charge Doping for Monolayer WSe₂ Based on Simple Liquid-phase Treatment[J]. Materials Reports, 2020, 34(12): 12025-12029.

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http://www.mater-rep.com/EN/10.11896/cldb.19040141 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12025

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