Boosting Excitonic Emission in 2D Multiple Quantum Well Superlattices by Plasma-Assisted Electrochemical Intercalation
Scalable fabrication of multiple quantum-well (MQW) superlattices via layer-by-layer stacking of two-dimensional (2D) materials remains challenging. Here, we propose a plasma-assisted electrochemical intercalation strategy to overcome this limitation. By intercalating 1-ethyl-3-methylimidazolium (EMIM<sup>+</sup>) cations into multilayer molybdenum disulfide (MoS<sub>2</sub>), followed by oxygen plasma intercalation, we achieve large-area (∼100 μm) MQW superlattices with hundreds of active layers. This approach enhances MoS<sub>2</sub> photoluminescence (PL) by 2 orders of magnitude, with the PL quantum yield (PLQY) increasing with both excitation power and thickness. The enhancement arises from interlayer-decoupling-induced bandgap directness and electron extraction induced by oxygen plasma, effectively suppressing charge transfer between heterointerfaces. Our findings provide a scalable route for fabricating quasi-MQW superlattices, opening new avenues for photophysics research and next-generation optoelectronics.
Authors
- Weiqiao Xia (ORCID: https://orcid.org/0000-0003-1626-2366)
- Peiyu Zeng (ORCID: https://orcid.org/0000-0002-4412-0405)
- Qiang Fu (ORCID: https://orcid.org/0009-0000-9606-6001)
- Jinshu Zhang
- Shaoqing Xiao (ORCID: https://orcid.org/0000-0002-0564-5532)
- Zhenhua Ni (ORCID: https://orcid.org/0000-0002-6316-2256)
- Junpeng Lü (ORCID: https://orcid.org/0000-0002-7099-3162)
- Qi Zhang (ORCID: https://orcid.org/0000-0003-4201-7196)
- Wei Liu (ORCID: https://orcid.org/0000-0002-6812-6107)
- Shixuan Wang (ORCID: https://orcid.org/0000-0002-8610-952X)
- Jian Li (ORCID: https://orcid.org/0000-0002-0492-7263)
- Xu Han (ORCID: https://orcid.org/0000-0001-6116-3258)
- Xiaoya Liu (ORCID: https://orcid.org/0000-0002-4361-5166)
- Zhexing Duan
Institutions
- Jiangnan University (CN)
- Beijing Institute of Technology (CN)
- Technology Applications (United States) (US)
- Integrated Sensors (United States) (US)
- Advanced Research Institute (US)
Publication Details
- Journal
- The Journal of Physical Chemistry Letters
- Published
- 2025-05-22
- DOI
- https://doi.org/10.1021/acs.jpclett.5c00826
- Citations
- 1
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.52
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Jiangsu Province
- Basic Research Program of Jiangsu Province
- National Key Research and Development Program of China