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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.00474 |
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| _version_ | 1866916638495866880 |
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| author | Fu, Qi Zhang, Yichi Shen, Jichuang Hong, Siyuan Wang, Jie Wang, Chen Shen, Jingyi Kong, Wei Zheng, Guolin Yan, Jun Wu, Jie Zheng, Changxi |
| author_facet | Fu, Qi Zhang, Yichi Shen, Jichuang Hong, Siyuan Wang, Jie Wang, Chen Shen, Jingyi Kong, Wei Zheng, Guolin Yan, Jun Wu, Jie Zheng, Changxi |
| contents | Due to its sizable direct bandgap and strong light-matter interactions, the preparation of monolayer $\mathrm{MoS}_{2}$ has attracted significant attention and intensive research efforts. However, multilayer $\mathrm{MoS}_{2}$ is largely overlooked because of its optically inactive indirect bandgap caused by interlayer coupling. It is highly desirable to modulate and decrease the interlayer coupling so that each layer in multilayer $\mathrm{MoS}_{2}$ can exhibit a monolayer-like direct-gap behavior. Here, we demonstrate the nanoprobe fabrication of $\mathrm{Li}_{x}\mathrm{MoS}_{2}$-based multilayers exhibiting a direct bandgap and strong photoluminescence emission from tightly bound excitons and trions. The fabrication is facilitated by our newly developed Li-ion platform, featuring tip-induced Li intercalation, air stability and rewritability. Raman characterizations reveal that controlled Li intercalation effectively transforms multilayer $\mathrm{MoS}_{2}$ into the stack of multiple monolayers, leading to a 26-fold enhancement of photoluminescence, compared to a monolayer. This intercalation result is different from existing observations of transforming $\mathrm{MoS}_{2}$ multilayers into metallic phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_00474 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Air-stable lithiation engineering of $\mathrm{MoS}_{2}$ for direct-bandgap multilayers Fu, Qi Zhang, Yichi Shen, Jichuang Hong, Siyuan Wang, Jie Wang, Chen Shen, Jingyi Kong, Wei Zheng, Guolin Yan, Jun Wu, Jie Zheng, Changxi Mesoscale and Nanoscale Physics Materials Science Due to its sizable direct bandgap and strong light-matter interactions, the preparation of monolayer $\mathrm{MoS}_{2}$ has attracted significant attention and intensive research efforts. However, multilayer $\mathrm{MoS}_{2}$ is largely overlooked because of its optically inactive indirect bandgap caused by interlayer coupling. It is highly desirable to modulate and decrease the interlayer coupling so that each layer in multilayer $\mathrm{MoS}_{2}$ can exhibit a monolayer-like direct-gap behavior. Here, we demonstrate the nanoprobe fabrication of $\mathrm{Li}_{x}\mathrm{MoS}_{2}$-based multilayers exhibiting a direct bandgap and strong photoluminescence emission from tightly bound excitons and trions. The fabrication is facilitated by our newly developed Li-ion platform, featuring tip-induced Li intercalation, air stability and rewritability. Raman characterizations reveal that controlled Li intercalation effectively transforms multilayer $\mathrm{MoS}_{2}$ into the stack of multiple monolayers, leading to a 26-fold enhancement of photoluminescence, compared to a monolayer. This intercalation result is different from existing observations of transforming $\mathrm{MoS}_{2}$ multilayers into metallic phases. |
| title | Air-stable lithiation engineering of $\mathrm{MoS}_{2}$ for direct-bandgap multilayers |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2503.00474 |