Deterministic Polymorphic Engineering of MoTe_2 for Photonic and Optoelectronic Applications

Faisal Ahmed; Carlos Rodríguez-Fernández; Henry A. FernandezYi ZhangAbde Mayeen ShafiGius UddinXiaoqi CuiHoon Hahn YoonNaveed MehmoodAndreas C. LiapisLide YaoHumeyra CaglayanZhipei SunHarri Lipsanen

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Deterministic Polymorphic Engineering of MoTe_2 for Photonic and Optoelectronic Applications

机译：Deterministic Polymorphic Engineering of MoTe_2 for Photonic and Optoelectronic Applications

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Developing selective and coherent polymorphic crystals at the nanoscaleoffers a novel strategy for designing integrated architectures for photonic andoptoelectronic applications such as metasurfaces, optical gratings, photodetectors,and image sensors. Here, a direct optical writing approach isdemonstrated to deterministically create polymorphic 2D materials by locallyinducing metallic 1T′-MoTe_2 on the semiconducting 2H-MoTe_2 host layer. In thepolymorphic-engineered MoTe_2, 2H- and 1T′- crystalline phases exhibit strongoptical contrast from near-infrared to telecom-band ranges (1–1.5 μm), due tothe change in the band structure and increase in surface roughness. Sevenfoldenhancement of third harmonic generation intensity is realized with conversionefficiency (susceptibility) of ≈1.7 × 10~(?7) (1.1 × 10~(?19) m~2 V~(?2)) and ≈1.7 × 10~(?8)(0.3 × 10~(?19) m~2 V~(?2)) for 1T′ and 2H-MoTe_2, respectively at telecom-band ultrafastpump laser. Lastly, based on polymorphic engineering on MoTe_2, a Schottkyphotodiode with a high photoresponsivity of 90 AW~(?1) is demonstrated. Thisstudy proposes facile polymorphic engineered structures that will greatly benefitrealizing integrated photonics and optoelectronic circuits.

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来源
《Advanced functional materials》 |2023年第33期|2302051.1-2302051.8|共8页
作者
Faisal Ahmed; Carlos Rodríguez-Fernández; Henry A. FernandezYi ZhangAbde Mayeen ShafiGius UddinXiaoqi CuiHoon Hahn YoonNaveed MehmoodAndreas C. LiapisLide YaoHumeyra CaglayanZhipei SunHarri Lipsanen;
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Department of Electronics and NanoengineeringAalto UniversityP.O. Box 13500, FI-00076 Aalto, Finland,QTF Center of ExcellenceDepartment of Applied PhysicsAalto University00076 Aalto, Finland;

Department of Electronics and NanoengineeringAalto UniversityP.O. Box 13500, FI-00076 Aalto, Finland;

Department of Applied PhysicsAalto University00076 Aalto, FinlandFaculty of Engineering and Natural SciencePhotonicsTampere University33720 Tampere, FinlandQTF Center of ExcellenceDepartment of Applied PhysicsAalto University00076 Aalto, Finland,Department of Electronics and NanoengineeringAalto UniversityP.O. Box 13500, FI-00076 Aalto, Finland;

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正文语种英语
中图分类无线电电子学、电信技术;工程材料学;
关键词
molybdenum ditelluride; phase change; polymorphic; reflectance; Schottky photodiode; third harmonic generation;

Deterministic Polymorphic Engineering of MoTe_2 for Photonic and Optoelectronic Applications

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