High responsivity Bi2Te3-based room temperature terahertz detector based on metal-semiconductor-metal (MSM) structure
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1.Department of Applied Physics, College of Science, DongHua University, Shanghai 201620, China;2.State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;3.University of Chinese Academy of Sciences, Beijing 100049, China;4.Shanghai Institute of Intelligent Electronics and Systems, Shanghai 201620, China

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the National Natural Science Foundation of China 61571011 61302148Supported by the National Natural Science Foundation of China (61571011, 61302148)

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    Abstract:

    In this study, a metal-topological insulator-metal (MTM) structure terahertz photodetector was fabricated based on a two-dimensional topological insulator Bi2Te3 material using a micro-nano process. The responsivity of device reaches 2×103 A/W at 0.02 THz, the noise equivalent power (NEP) is lower than 7.5×10-15 W/Hz1/2, and the detectivity D* is higher than 1.62 ×1011 cm?Hz1/2 /W; The responsivity is up to 281.6 A/W at 0.166 THz, NEP is lower than 5.18×10-14 W/Hz1/2, D* is higher than 2.2×1010 cm?Hz1/2/W; The responsivity is up to 7.74 A/W at 0.332 THz, NEP is lower than1.75×10-12 W/Hz1/2, D* is higher than 6.7×108 cm?Hz1/2 /W; at the same time, the response time of device has 7~8 μs in the terahertz band. This work breaks through the inter-band transition of traditional photon detection, and realizes terahertz detectors with room temperature operation, high response rate, high speed response and high sensitivity.

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XU Xin-Yue, ZHANG Xiao-Dong, WU Jing, JIANG Lin, WU Cai-Yang, YAO Niang-juan, QU Yue, ZHOU Wei, YIN Yi-Ming, HUANG Zhi-Ming. High responsivity Bi2Te3-based room temperature terahertz detector based on metal-semiconductor-metal (MSM) structure[J]. Journal of Infrared and Millimeter Waves,2019,38(4):459~463

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History
  • Received:December 12,2018
  • Revised:December 20,2018
  • Adopted:December 25,2018
  • Online: September 06,2019
  • Published: