Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 15, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.202100212
Keywords
heterostructures; terahertz photodetectors; topological materials; transition-metal ditellurides; type-II Dirac semimetals
Funding
- State Key Program for Basic Research of China [2017YFA0305500, 2018YFA0306204]
- National Natural Science Foundation of China [61521005, 61875217, 91850208]
- STCSM [1859078100, 19590780100]
- Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University [KF1809]
- Ministry of Science and Higher Education of the Russian Federation [FEUZ-2020-0060]
- Science Education and Research Board (SERB)
- Department of Science and Technology (DST), government of India
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Transition-metal dichalcogenides PtTe2, PdTe2, and NiTe2 show high-speed terahertz detection capability at room temperature and can efficiently detect THz light using photodetectors based on their heterostructures, demonstrating great research potential for remote sensing and telecommunications applications.
Transition-metal dichalcogenides PtTe2, PdTe2, and NiTe2 deserve particular attention, due to the presence of type-II Dirac fermions. As a matter of fact, tilted Dirac cones afford a suitable platform for optoelectronics of dissipation-less carrier-transport, favored by their ultrahigh carrier mobility, and large nonsaturating magnetoresistance. Herein, it is shown that PtTe2, PdTe2, and NiTe2 display high-speed terahertz (THz) detection capability at room temperature, which originates from their peculiar band structure with topologically protected electronic states. Furthermore, photodetectors based on their heterostructures are able to suppress dark current with high-performance detection of THz light. Furthermore, these crystals are stable in air and they can be easily exfoliated in nanosheets by liquid-phase exfoliation, due to the weak interlayer van der Waals bonds. The obtained results clearly establish that the type-II Dirac semimetals based on transition-metal ditellurides have immense research potential for addressing application-oriented issues for remote sensing and telecommunications.
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