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Updated: Apr 24, 2026

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High-Resolution Microlens-Assisted Tunable n-Type Optical Doping in Monolayer MoS2.

Junil Kim1, Kyungjune Cho2, Jieun Lee1

  • 1Department of Electrical Engineering and Computer Science, Convergence Research Advanced Centre for Olfaction, DGIST, Daegu, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|April 23, 2026
PubMed
Summary

Laser-assisted microlens array processing (LAMP) precisely dopes monolayer molybdenum disulfide (MoS2) by creating sulfur vacancies. This technique enhances transistor performance and carrier density, offering a stable, localized defect control method.

Keywords:
2D transition metal dichalcogenidesdefect engineeringlaser‐assisted microlens array processingmonolayer MoS2n‐type optical dopingsulfur vacancies

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Atomically thin two-dimensional transition metal dichalcogenides (2D TMDCs), particularly monolayer MoS2, are key for advanced transistors.
  • Their high surface-to-volume ratio makes them susceptible to defects, necessitating precise defect control.

Purpose of the Study:

  • To introduce a laser-assisted microlens array processing (LAMP) technique for localized optical doping of monolayer MoS2.
  • To demonstrate LAMP's ability to precisely control defect profiles and enhance electronic properties.

Main Methods:

  • Utilized self-assembled polystyrene microspheres as microlenses to focus a 532 nm continuous-wave laser.
  • Applied low laser powers (40-60 mW) to selectively generate sulfur vacancies below the diffraction limit.
  • Employed spectroscopic analyses to characterize defects and vacancy density.

Main Results:

  • Achieved highly localized n-type optical doping of monolayer MoS2.
  • Demonstrated systematic control over sulfur vacancy concentration without significant thermal damage.
  • Observed electron-donor-like defects and tunable vacancy density.
  • MoS2 transistors showed up to a 51-fold increase in field-effect mobility and a 37-fold increase in carrier density.
  • Enhanced n-type characteristics remained stable for weeks.

Conclusions:

  • LAMP provides a high-resolution, low-energy, and reproducible method for vacancy engineering in 2D TMDCs.
  • This complementary metal-oxide-semiconductor-compatible technique enables precise post-fabrication tuning of electronic properties.
  • LAMP offers a significant advancement for developing next-generation 2D electronic devices.