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Published on: November 1, 2013
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Designing artificial 2D crystals with site and size controlled quantum dots
Xuejun Xie1, Jiahao Kang1, Wei Cao1
1Department of Electrical and Computer Engineering, University of California, Santa Barbara, California, 93106, USA.
Scientific Reports
|September 1, 2017
Summary
Researchers created ordered quantum dot arrays in 2D molybdenum disulfide (MoS2) using electron beams. This controllable method tunes the band gap for tunable lasers and advanced quantum systems.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Ordered quantum dots in 2D materials offer potential for advanced optical applications.
- Fabricating such precise structures at scale remains a significant challenge.
Purpose of the Study:
- To develop a scalable, site- and size-controlled method for fabricating quantum dot arrays in 2D materials.
- To investigate the optoelectronic properties of these engineered quantum dot superlattices.
Main Methods:
- Utilized focused electron beam irradiation to induce local phase changes in monolayer molybdenum disulfide (MoS2).
- Engineered quantum dots into 2D superlattices with controlled size and pitch.
- Investigated the resulting energy band formation and band gap tunability.
Main Results:
- Achieved scalable, site- and size-controlled fabrication of quantum dots and arrays in MoS2.
- Demonstrated tunable band gaps from 1.81 eV to 1.42 eV by controlling quantum dot superlattice parameters.
- Maintained photoluminescence performance across the tunable band gap range.
Conclusions:
- Developed a photoresist-free, top-down method for large-area quantum dot array fabrication.
- The engineered quantum dot superlattices enable new pathways for fabricating lasers with designed wavelengths.
- This technique facilitates the creation of artificial 2D materials and large-scale quantum information systems.
