Deterministic Polymorphic Engineering of MoTe2 for Photonic and Optoelectronic Applications
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-08-15
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en
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Advanced Functional Materials, Volume 33, issue 33
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.Description
Funding Information: This research was supported by the Academy of Finland [Grant No. 320167 (PREIN Flagship – Aalto University)], Grant No. 320165 (PREIN Flagship – Tampere University)], and GrapheneCore3 number 881603. Academy of Finland (314810, 333982, 336144, 336818, and 348920), the European Union's Horizon 2020 research and innovation program (820423,S2QUIP, Marie Sklodowska‐Curie grant agreement N° 895369), the EU H2020‐MSCA‐RISE‐872049 (IPN‐Bio), ERC (834742), and Horizon Europe (HORIZON) Project: ChirLog (101067269). The authors would like to acknowledge the provision of facilities and technical support from the Otaniemi research infrastructure (OtaNano‐Micronova Nanofabrication Centre and OtaNano‐Nanomicroscopy Centre). | openaire: EC/H2020/820423/EU//S2QUIP | openaire: EC/H2020/834742/EU//ATOP | openaire: EC/H2020/872049/EU//IPN-Bio | openaire: EC/HE/101067269/EU//ChirLog
Keywords
molybdenum ditelluride, phase change, polymorphic, reflectance, Schottky photodiode, third harmonic generation
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Ahmed, F, Rodríguez-Fernández, C, Fernandez, H A, Zhang, Y, Shafi, A M, Uddin, M G, Cui, X, Yoon, H H, Mehmood, N, Liapis, A C, Yao, L, Caglayan, H, Sun, Z & Lipsanen, H 2023, ' Deterministic Polymorphic Engineering of MoTe 2 for Photonic and Optoelectronic Applications ', Advanced Functional Materials, vol. 33, no. 33, 2302051 . https://doi.org/10.1002/adfm.202302051