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Controllable growth of type-II Dirac semimetal PtTe2 atomic layer on Au substrate for sensitive room temperature terahertz photodetection

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InfoMat 2021年第6期3卷 705-715页

作者： Yang Yang Kaixuan Zhang Libo Zhang Guo Hong Chao Chen Hongmei Jing Jiangbo Lu Peng Wang Xiaoshuang Chen Lin Wang Hua Xu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'anChina State Key Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina Department of Optoelectronic Science and Engineering Donghua UniversityShanghaiChina Department of Physics and Chemistry Faculty of Science and TechnologyInstitute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina School of Physics and Information Technology Shaanxi Normal UniversityXi'anChina

Platinum telluride(PtTe_(2)),a member of metallic transition metal dichalcogenides,provides a new platform for investigating various properties such as type-II Dirac fermions,topological superconductivity,and wide-band ***,the study of PtTe_(2)is largely limited to exfoliated flakes,and its direct synthesis remains ***,we report the controllable synthesis of highly crystalline 2D PtTe_(2)crystals with tunable morphology and thickness via chemical vapor deposition(CVD)growth on Au *** adjusting Te amount and substrate temperature,anisotropic and isotropic growth modes of PtTe_(2)were realized on the solid and molten Au substrates,*** domain size of PtTe_(2)crystal was achieved up to 30μm,and its thickness can be tuned from 5.6 to 50 nm via controlling the growth ***,a metal–PtTe_(2)–metal structural device was fabricated to validate the wide-band terahertz(THz)photodetection from 0.04 to 0.3 THz at room *** to the high crystallinity of PtTe_(2)crystal,the photodetector acquires high responsivity(30–250 mA W-1 from 0.12 to 0.3 THz),fast response rate(rise time:7μs,decay time:8μs),and high-quality imaging *** work demonstrates the feasibility for realistic exploitation of high-performing photodetection system at THz band based on the CVDgrown 2D Dirac semimetal materials.

关键词： 2D materials chemical vapor deposition Dirac semimetal platinum telluride terahertz photodetection

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