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Title: A broadband, self-powered, and polarization-sensitive PdSe₂ photodetector based on asymmetric van der Waals contacts
Authors: Zhang, Xuran
Dai, Mingjin
Deng, Wenjie
Zhang, Yongzhe
Wang, Qi Jie
Keywords: Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Issue Date: 2023
Source: Zhang, X., Dai, M., Deng, W., Zhang, Y. & Wang, Q. J. (2023). A broadband, self-powered, and polarization-sensitive PdSe₂ photodetector based on asymmetric van der Waals contacts. Nanophotonics, 12(3), 607-618.
Project: NRF-CRP22-2019-0007 
Journal: Nanophotonics 
Abstract: Self-powered photodetectors with broadband and polarization-sensitive photoresponse are desirable for many important applications such as wearable electronic devices and wireless communication systems. Recently, two-dimensional (2D) materials have been demonstrated as promising candidates for self-powered photodetectors owing to their advantages in light–matter interaction, transport, electronic properties, and so on. However, their performance in speed, broadband response, and multifunction is still limited. Here, we report a PdSe2 photodetector with asymmetric van der Waals (vdWs) contacts formed by using a homojunction configuration. This device achieves a high responsivity approaching 53 mA/W, a rise/decay time of about 0.72 ms/0.24 ms, and a detectivity of more than 5.17 × 1011 Jones in the visible-near infrared regime (532–1470 nm). In addition, a linear polarization-sensitive response can be observed with an anisotropy ratio of 1.11 at 532 nm and 1.62 at 1064 nm. Furthermore, a strong anisotropic response endows this photodetector withoutstanding polarization imaging capabilities, realizing a contrast-enhanced degree of linear polarization imaging.Our proposed device architecture demonstrated the great potential of PdSe2-based asymmetric vdWs contacts for high-performance photodetectors operating without any external bias.
ISSN: 2192-8606
DOI: 10.1515/nanoph-2022-0660
Schools: School of Electrical and Electronic Engineering 
Rights: © 2022 The author(s), published by De Gruyter. This work is licensed under the Creative Commons Attribution 4.0 International License.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
SPMS Journal Articles

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