Excitonic insulator powers room-temperature ultra-sensitive visible to terahertz detection
Phase transitions induce significant changes in the electrical and photonic properties of materials. Ultra-sensitive photodetectors leveraging material phase transitions can be realized near the transition temperature. Photodetectors based on Ta<sub>2</sub>NiSe<sub>5</sub>, a room-temperature excitonic insulator phase transition material, exhibit exceptional performance from visible to terahertz frequencies. Specifically, in the terahertz range, the electronic bandwidth is 360 kHz, and the specific detectivity (D*) reaches 5.3 × 10<sup>11</sup> cm·Hz<sup>1/2</sup>·W<sup>-1</sup>. The van der Waals heterostructure of Ta<sub>2</sub>NiSe<sub>5</sub>/WS<sub>2</sub> further enhances performance.
Authors
- Yongzhe Zhang (ORCID: https://orcid.org/0000-0002-3471-4402)
- Yi Wu (ORCID: https://orcid.org/0000-0002-2999-1296)
- Wenjie Deng (ORCID: https://orcid.org/0000-0002-7846-1101)
Institutions
- Beijing University of Technology (CN)
- Beijing Information Science & Technology University (CN)
Publication Details
- Journal
- Light Science & Applications
- Published
- 2025-04-02
- DOI
- https://doi.org/10.1038/s41377-025-01828-8
- Citations
- 1
- Primary Topic
- Advanced Semiconductor Detectors and Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.73