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02-12-2023 | Original Article

High-performance Si/VO₂-nanorod heterojunction photodetector based on photothermoelectric effect for detecting human radiation

Authors: Fu-Hai Guo, Lan-Zhong Hao, Wei-Zhuo Yu, Si-Qi Li, Guan-Chu Liu, Jing-Yi Hao, Yun-Jie Liu

Published in: Rare Metals | Issue 3/2024

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Abstract

As a typical candidate of optoelectronic materials, vanadium dioxide (VO₂) has wide applications in photodetectors (PDs), but is still challenging in largely enhancing the photodetecting performance for low-power human radiation. Herein, high-performance Si/VO₂ nanorods (NRs) heterojunction PDs based on the photothermoelectric (PTE) effect are presented. The uniform VO₂-NRs array films were deposited on Si by using magnetron sputtering technique, and a Si/VO₂ heterojunctions were fabricated. The device exhibits a four-stage photoresponse and broadband photoresponse from ultraviolet to long-wavelength infrared. Benefited from the unique nanorods structure and the strong PTE effect, the fabricated device exhibits a large enhancement of the photodetecting performance, showing an ultrahigh photodetectivity of 1.6 × 10¹³ Jones and ultrafast response rates with a rising-edge time of ~ 65.0 μs, three orders of magnitude higher than other VO₂-based devices. Furthermore, the device exhibits unique abilities to detect human radiation even when the human fingers are far away from the device surface up to 10.0 cm. Additionally, the fabricated Si/VO₂ devices can also be applied as breath sensors to distinguish different breathing patterns. These results supply an effective route to design high-performance photodetectors toward detecting human thermal radiation and respiration.

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Title: High-performance Si/VO2-nanorod heterojunction photodetector based on photothermoelectric effect for detecting human radiation
Authors: Fu-Hai Guo
Lan-Zhong Hao
Wei-Zhuo Yu
Si-Qi Li
Guan-Chu Liu
Jing-Yi Hao
Yun-Jie Liu
Publication date: 02-12-2023
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 3/2024
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-023-02497-5

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