Citation: Mengchen Wang, Wenhui Wang, Yong Zhang, Xing Liu, Lei Gao, Xiaoxue Jing, Zhenliang Hu, Junpeng Lu, Zhenhua Ni. Controllable n-type doping in WSe₂ monolayer via construction of anion vacancies[J]. Chinese Chemical Letters, ;2021, 32(10): 3118-3122. doi: 10.1016/j.cclet.2021.03.048 shu

Controllable n-type doping in WSe₂ monolayer via construction of anion vacancies

School of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189, China

phyhzl@seu.edu.cn

phyljp@seu.edu.cn

Received Date: 30 January 2021
Revised Date: 13 March 2021
Accepted Date: 15 March 2021
Available Online: 20 March 2021

Figures(4)

The successful applications of two-dimensional (2D) transition metal dichalcogenides highly rely on rational regulation of their electronic properties. The nondestructive and controllable doping strategy is of great importance to implement 2D materials in electronic devices. Herein, we propose a straightforward and effective method to realize controllable n-type doping in WSe₂ monolayer by electron beam irradiation. Electrical measurements and photoluminescence (PL) spectra verify the strong n-doping in electron beam-treated WSe₂ monolayers. The n-type doping arises from the generation of Se vacancies and the doping degree is precisely controlled by irradiation fluences. Due to the n-doping-induced narrowing of the Schottky barrier, the current of back-gated monolayer WSe₂ is enhanced by an order of magnitude and a ~8 × increase in the electron filed-effect mobility is observed. Remarkably, it is a moderate method without significant reduction in electrical performance and severe damage to lattice structures even under ultra-high doses of irradiation.
- WSe₂,
- Electron beam irradiation,
- Vacancy,
- Doping,
- Schottky barrier
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Controllable n-type doping in WSe2 monolayer via construction of anion vacancies

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通讯作者: 陈斌, bchen63@163.com

Controllable n-type doping in WSe₂ monolayer via construction of anion vacancies