Visible Near-Infrared Photodetection Based on Ta2NiSe5/WSe2 van der Waals Heterostructures

• Main Authors: Han, L. (Author), Shi, C. (Author), Tang, W. (Author), Xiao, P. (Author), Yang, J. (Author), Zhang, L. (Author), Zhang, S. (Author), Zhu, B. (Author)
• Format: Article
• Language: English
• Published: MDPI 2023
• Subjects: article; Band characteristics; Crystals structures; external bias; heterostructure; imaging; Infrared devices; infrared radiation; Integrated systems; Nickel compounds; Niobium compounds; Photo detection; photodetection; room temperature; Schottky barrier; Schottky barrier diodes; Schottky barriers; Selenium compounds; Spectrum detection; Ta2NiSe5; Tantalum compounds; Tungsten compounds; Two-dimensional materials; Van der Waal; Van der Waals forces; Visible near-infrared; Wide spectrum; WSe2
• Online Access: View Fulltext in Publisher; View in Scopus
• ISBN: 14248220 (ISSN)
• DOI: 10.3390/s23094385

The increasing interest in two-dimensional materials with unique crystal structures and novel band characteristics has provided numerous new strategies and paradigms in the field of photodetection. However, as the demand for wide-spectrum detection increases, the size of integrated systems and the limitations of mission modules pose significant challenges to existing devices. In this paper, we present a van der Waals heterostructure photodetector based on Ta2NiSe5/WSe2, leveraging the inherent characteristics of heterostructures. Our results demonstrate that this detector exhibits excellent broad-spectrum detection ability from the visible to the infrared bands at room temperature, achieving an extremely high on/off ratio, without the need for an external bias voltage. Furthermore, compared to a pure material detector, it exhibits a fast response and low dark currents (~3.6 pA), with rise and fall times of 278 μs and 283 μs for the response rate, respectively. Our findings provide a promising method for wide-spectrum detection and enrich the diversity of room-temperature photoelectric detection. © 2023 by the authors.