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Abstract
Developing selective and coherent polymorphic crystals at the nanoscale offers a novel strategy for designing integrated architectures for photonic and optoelectronic applications such as metasurfaces, optical gratings, photodetectors, and image sensors. Here, a direct optical writing approach is demonstrated to deterministically create polymorphic 2D materials by locally inducing metallic 1T′-MoTe2 on the semiconducting 2H-MoTe2 host layer. In the polymorphic-engineered MoTe2, 2H- and 1T′- crystalline phases exhibit strong optical contrast from near-infrared to telecom-band ranges (1–1.5 µm), due to the change in the band structure and increase in surface roughness. Sevenfold enhancement of third harmonic generation intensity is realized with conversion efficiency (susceptibility) of ≈1.7 × 10−7 (1.1 × 10−19 m2 V−2) and ≈1.7 × 10−8 (0.3 × 10−19 m2 V−2) for 1T′ and 2H-MoTe2, respectively at telecom-band ultrafast pump laser. Lastly, based on polymorphic engineering on MoTe2, a Schottky photodiode with a high photoresponsivity of 90 AW−1 is demonstrated. This study proposes facile polymorphic engineered structures that will greatly benefit realizing integrated photonics and optoelectronic circuits.
Original language | English |
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Article number | 2302051 |
Journal | Advanced Functional Materials |
Volume | 33 |
Issue number | 33 |
Early online date | 2023 |
DOIs | |
Publication status | Published - 15 Aug 2023 |
MoE publication type | A1 Journal article-refereed |
Keywords
- molybdenum ditelluride
- phase change
- polymorphic
- reflectance
- Schottky photodiode
- third harmonic generation
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Dive into the research topics of 'Deterministic Polymorphic Engineering of MoTe2 for Photonic and Optoelectronic Applications'. Together they form a unique fingerprint.-
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FAST: Ultrafast Data Production with Broadband Photodetectors for Active Hyperspectral Space Imaging
Sun, Z., Akkanen, S., Pajunpää, T., Cui, L., Nigmatulin, F. & Das, S.
01/01/2021 → 31/12/2023
Project: Academy of Finland: Other research funding
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NOIMO: Novel optical isolators to continue Moore's law in photonics integration
01/09/2020 → 31/08/2024
Project: Academy of Finland: Other research funding
Equipment
Press/Media
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Researchers from Aalto University Detail Findings in Engineering (Deterministic Polymorphic Engineering of Mote2 for Photonic and Optoelectronic Applications)
Harri Lipsanen, Zhipei Sun & Lide Yao
13/06/2023
1 item of Media coverage
Press/Media: Media appearance