Construction of Schottky contact by modification with Pt particles to enhance the performance of ultra-long V2O5 nanobelt photodetectors

Wen Zeng; Nan Chen; Lingjiao Zhang; Chuan Liu; Pengyi Liu; Fangyan Xie; Yang Zhou; Weiguang Xie

doi:10.1016/j.jcis.2021.08.216

Construction of Schottky contact by modification with Pt particles to enhance the performance of ultra-long V₂O₅ nanobelt photodetectors

J Colloid Interface Sci. 2022 Feb;607(Pt 2):1919-1927. doi: 10.1016/j.jcis.2021.08.216. Epub 2021 Oct 7.

Authors

Wen Zeng¹, Nan Chen¹, Lingjiao Zhang², Chuan Liu², Pengyi Liu³, Fangyan Xie⁴, Yang Zhou⁵, Weiguang Xie⁶

Affiliations

¹ Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou, Guangdong 510632, China.
² State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou, Guangdong 510275, China.
³ Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou, Guangdong 510632, China; Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou, Guangdong 510632, China.
⁴ Instrumental Analysis & Research Center, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
⁵ Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou, Guangdong 510632, China. Electronic address: yangzhou@email.jnu.edu.cn.
⁶ Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou, Guangdong 510632, China; Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou, Guangdong 510632, China. Electronic address: wgxie@email.jnu.edu.cn.

PMID: 34695740
DOI: 10.1016/j.jcis.2021.08.216

Abstract

Schottky-contacted nanosensors have attracted extensive attention due to their high sensitivity and fast response time. In this article, we proved that the construction of Schottky contact by Pt nanoparticles (NPs) decoration can effectively improve the performance of V₂O₅ nanobelts photodetectors. After modified by Pt NPs, the photocurrent of V₂O₅ nanobelts is increased by more than two orders of magnitude, and the photoresponse speed is improved by at least three orders of magnitude. Detailed studies have shown that the performance enhancement is attributed to the formation of the Schottky contact at the electrode-semiconductor interface due to the decrease of surface gas adsorption and the increase of V₂O₅ work function after Pt NPs modification. The strong built-in field in the Schottky barrier region will quickly separate photogenerated carriers, thereby reducing the electron-hole recombination rate, resulting in the fast response time and an increase in the free carrier density. Moreover, it is found that this enhancement effect can be regulated by controlling the pressure to modulating the Schottky barrier height at the interface. Overall, the Pt NPs-modified V₂O₅ nanobelts photodetector exhibits a broad response spectrum (visible to near infrared), fast rise/fall response time (less than 6.12/6.15 ms), high responsivity (5.6 A/W), and high specific detectivity (6.9 × 10⁸ Jones). This study demonstrates the feasibility of building a Schottky barrier to enhance the photodetection performance, which provides a general and effective strategy towards the construction and its practical application of supersensitive and fast-response nanosensors.

Keywords: Photodetectors; Pt NPs; Schottky junction; V(2)O(5).