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2019 Volume 27 Issue 4
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Jin Wang, Cheng Guo, Wanlong Guo, Lin Wang, Wangzhou Shi, Xiaoshuang Chen. 2019: Tunable 2H-TaSe2 room-temperature terahertz photodetector, Chinese Physics B, 28(4): 18-22. doi: 10.1088/1674-1056/28/4/046802
Citation: Jin Wang, Cheng Guo, Wanlong Guo, Lin Wang, Wangzhou Shi, Xiaoshuang Chen. 2019: Tunable 2H-TaSe2 room-temperature terahertz photodetector, Chinese Physics B, 28(4): 18-22. doi: 10.1088/1674-1056/28/4/046802
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Tunable 2H-TaSe2 room-temperature terahertz photodetector

  • Department of Physics, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, China;State Key Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

  • State Key Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;University of Chinese Academy of Sciences, Beijing 100049, China

  • Department of Physics, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, China

  • Fund Project: the State Key Basic Research Program of China(Grant .2017YFA0205801,2017YFA0305500,and 2013CB632705)%the National Natural Science Foundation of China(Grant .11334008,61290301,61521005,61405230,and 61675222)%the Youth Innovation Promotion Association%the Aviation Science Fund(Grant 20162490001)
  • Two-dimensional transition metal dichalcogenides (TMDs) provide fertile ground to study the interplay between dimensionality and electronic properties because they exhibit a variety of electronic phases,such as semiconducting,superconducting,charge density waves (CDW) states,and other unconventional physical properties.Compared with other classical TMDs,such as Mort insulator 1T-TaS2 or superconducting 2H-NbSe2,bulk 2H-TaSe2 has been a canonical system and a touchstone for modeling the CDW measurement with a less complex phase diagram.In contrast to ordinary semiconductors that have only single-particle excitations,CDW can have collective excitation and carry current in a collective fashion.However,manipulating this collective condensation of these intriguing systems for device applications has not been explored.Here,the CDW-induced collective driven of non-equilibrium carriers in a field-effect transistor has been demonstrated for the sensitive photodetection at the highly-pursuit terahertz band.We show that the 2H-TaSe2-based photodetector exhibits a fast photoresponse,as short as 14 μs,and a responsivity of over 27 V/W at room temperature.The fast response time,relative high responsivity and ease of fabrication of these devices yields a new prospect of exploring CDW condensate in TMDs with the aim of overcoming the existing limitations for a variety of practical applications at THz spectral range.
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Tunable 2H-TaSe2 room-temperature terahertz photodetector

Abstract: Two-dimensional transition metal dichalcogenides (TMDs) provide fertile ground to study the interplay between dimensionality and electronic properties because they exhibit a variety of electronic phases,such as semiconducting,superconducting,charge density waves (CDW) states,and other unconventional physical properties.Compared with other classical TMDs,such as Mort insulator 1T-TaS2 or superconducting 2H-NbSe2,bulk 2H-TaSe2 has been a canonical system and a touchstone for modeling the CDW measurement with a less complex phase diagram.In contrast to ordinary semiconductors that have only single-particle excitations,CDW can have collective excitation and carry current in a collective fashion.However,manipulating this collective condensation of these intriguing systems for device applications has not been explored.Here,the CDW-induced collective driven of non-equilibrium carriers in a field-effect transistor has been demonstrated for the sensitive photodetection at the highly-pursuit terahertz band.We show that the 2H-TaSe2-based photodetector exhibits a fast photoresponse,as short as 14 μs,and a responsivity of over 27 V/W at room temperature.The fast response time,relative high responsivity and ease of fabrication of these devices yields a new prospect of exploring CDW condensate in TMDs with the aim of overcoming the existing limitations for a variety of practical applications at THz spectral range.

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