Deterministic Polymorphic Engineering of MoTe2 for Photonic and Optoelectronic Applications

Faisal Ahmed*, Carlos Rodríguez-Fernández, Henry A. Fernandez, Yi Zhang, Abde Mayeen Shafi, Md Gius Uddin, Xiaoqi Cui, Hoon Hahn Yoon, Naveed Mehmood, Andreas C. Liapis, Lide Yao, Humeyra Caglayan, Zhipei Sun, Harri Lipsanen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
1 Downloads (Pure)


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 languageEnglish
Article number2302051
JournalAdvanced Functional Materials
Issue number33
Early online date2023
Publication statusPublished - 15 Aug 2023
MoE publication typeA1 Journal article-refereed


  • molybdenum ditelluride
  • phase change
  • polymorphic
  • reflectance
  • Schottky photodiode
  • third harmonic generation


Dive into the research topics of 'Deterministic Polymorphic Engineering of MoTe2 for Photonic and Optoelectronic Applications'. Together they form a unique fingerprint.

Cite this