Building Low-Cost, High-Performance Flexible Photodetector Based on Tetragonal Phase VO2 (A) Nanorod Networks

Author:

Lin Wenhui1,Tang Chaoyang1,Wang Feiyu1,Zhu Yiyu1,Wang Zhen1,Li Yifan1,Wu Qiuqi1,Lei Shuguo1,Zhang Yi2ORCID,Hou Jiwei1ORCID

Affiliation:

1. Department of Physics, School of Physical and Mathematical Science, Nanjing Tech University, Nanjing 211816, China

2. School of Energy Science and Engineering, Nanjing Tech University, Nanjing 211816, China

Abstract

We present a straightforward and cost-effective method for the fabrication of flexible photodetectors, utilizing tetragonal phase VO2 (A) nanorod (NR) networks. The devices exhibit exceptional photosensitivity, reproducibility, and stability in ambient conditions. With a 2.0 V bias voltage, the device demonstrates a photocurrent switching gain of 1982% and 282% under irradiation with light at wavelengths of 532 nm and 980 nm, respectively. The devices show a fast photoelectric response with rise times of 1.8 s and 1.9 s and decay times of 1.2 s and 1.7 s for light at wavelengths of 532 nm and 980 nm, respectively. In addition, the device demonstrates exceptional flexibility across large-angle bending and maintains excellent mechanical stability, even after undergoing numerous extreme bending cycles. We discuss the electron transport process within the nanorod networks, and propose a mechanism for the modulation of the barrier height induced by light. These characteristics reveal that the fabricated devices hold the potential to serve as a high-performance flexible photodetector.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

State Key Laboratory of Materials-Oriented Chemical Engineering

Postgraduate Research & Practice Innovation Program of Jiangsu Province

Publisher

MDPI AG

Subject

General Materials Science

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