• Laser & Optoelectronics Progress
  • Vol. 60, Issue 18, 1811023 (2023)
Zhihong Lai1、2, Yongjiang Xu1、2, Tantan Xu1、2, Yuan Liu1、2, Yun Shen1、*, and Xiaohua Deng2、**
Author Affiliations
  • 1College of Physics and Materials Science, Nanchang University, Nanchang 330031, Jiangxi , China
  • 2Institute of Space Science and Technology, Nanchang University, Nanchang 330031, Jiangxi , China
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    DOI: 10.3788/LOP231427 Cite this Article Set citation alerts
    Zhihong Lai, Yongjiang Xu, Tantan Xu, Yuan Liu, Yun Shen, Xiaohua Deng. Self-Driven Terahertz Detector Based on Topological Semimetal NiTe2[J]. Laser & Optoelectronics Progress, 2023, 60(18): 1811023 Copy Citation Text show less

    Abstract

    Terahertz radiation has broad application prospects in many fields, including high-speed communication, biomedicine, nondestructive testing, space exploration, and security. However, the development of a highly sensitive room-temperature terahertz detector is an urgent issue that must be addressed. The special optoelectronic properties of emerging topological materials open up new paths for terahertz detection. In this study, the band structure and topological surface states of the type II Dirac semimetal NiTe2 were calculated based on first-principles calculations. NiTe2 nanosheets were obtained by mechanical exfoliation, and metal-NiTe2-metal field effect transistors were fabricated using integrated-circuit processing technology. The photoelectric response of the device to terahertz radiation was measured. The results show that the NiTe2-based terahertz detector has a high response rate of 2.44 A/W and a noise equivalent power of approximately 14.96 pW/Hz1/2. Particularly, even at a zero bias voltage, the response rate remains 2.25 A/W, and the noise equivalent power decreases to 9.55 pW/Hz1/2. These characteristics are better than those of similar terahertz detectors, and the device is stable in air and has excellent linearity within a certain range. These results are of great significance for further promoting the practical application and integration of room-temperature terahertz detectors.
    Zhihong Lai, Yongjiang Xu, Tantan Xu, Yuan Liu, Yun Shen, Xiaohua Deng. Self-Driven Terahertz Detector Based on Topological Semimetal NiTe2[J]. Laser & Optoelectronics Progress, 2023, 60(18): 1811023
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