A self-powered ultraviolet photodetector with van der Waals Schottky junction based on TiO2 nanorod arrays/Au-modulated V2CTx MXene

doi:10.1016/j.jmst.2023.02.010

J. Mater. Sci. Technol. ›› 2023, Vol. 156: 83-91.DOI: 10.1016/j.jmst.2023.02.010

• Research Article • Previous Articles Next Articles

A self-powered ultraviolet photodetector with van der Waals Schottky junction based on TiO₂ nanorod arrays/Au-modulated V₂CT_x MXene

Guangcan Luo^a,1, Ziling Zhang^b,1, Yabing Wang^a, Qun Deng^a, Shengtao Pan^a, Tengfei Wang^a, Qinghong Li^a, Kaixiang Liu^a, Pengfei Kong^c,*, Jing Zhang^a, Shengyun Luo^a,*, Hong Lin^b,*

^aLaboratory of Optoelectronic Materials and Devices, Key Laboratory of New Energy and Nanomaterials, School of Materials Science and Engineering, Guizhou Minzu University, Guiyang 550025, China;
^bState Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
^cResearch Center for Humanoid Sensing, Zhejiang Lab, Hangzhou 311100, China

Received:2023-01-14 Revised:2023-02-18 Accepted:2023-02-19 Published:2023-09-01 Online:2023-03-21
Contact: * E-mail addresses: kongpf@zhejianglab.com (P. Kong), lsy@gzmu.edu.cn (S. Luo), hong-lin@tsinghua.edu.cn (H. Lin) .
About author:¹ These authors contributed equally to this work.

Abstract

Abstract: A self-powered ultraviolet photodetector (UV PD) with van der Waals (vdW) Schottky junction based on TiO₂ nanorod arrays/Au-modulated V₂CT_x MXene is reported. The Schottky junction enables the device to operate in self-powered mode. The dangling bond-free surface of V₂CT_x MXene reduces the charge recombination at the junction interface. Meanwhile, V₂CT_x MXene, with the work function (WF) increasing to 5.35 eV, forms a hole transport layer by contacting with Au electrode, which facilitates the carrier extraction. The electron lifetime in the device has prolonged to 8.95 μs. As a result, the responsivity and detectivity of the PD have achieved 28 mA/W and 1.2 × 10¹¹ cm Hz^1/2/W (340 nm, 65 mW/cm², 0 V), respectively. In addition, the presence of the Au electrode prevents the vanadium from coming into contact with oxygen and oxidizing, preserving the properties of the V₂CT_x films. After 180 days of exposure to the atmosphere, the device performance remained at a particularly high level, indicating enhanced durability. This work points out an effective approach to modulate the properties of V₂CT_x to obtain the high performance and stability of the UV PD.

Key words: TiO₂ nanorod arrays, V₂CT_x Mxene, Work function, Ultraviolet photodetectors, Device stability

Guangcan Luo, Ziling Zhang, Yabing Wang, Qun Deng, Shengtao Pan, Tengfei Wang, Qinghong Li, Kaixiang Liu, Pengfei Kong, Jing Zhang, Shengyun Luo, Hong Lin. A self-powered ultraviolet photodetector with van der Waals Schottky junction based on TiO₂ nanorod arrays/Au-modulated V₂CT_x MXene[J]. J. Mater. Sci. Technol., 2023, 156: 83-91.

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A self-powered ultraviolet photodetector with van der Waals Schottky junction based on TiO₂ nanorod arrays/Au-modulated V₂CT_x MXene

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