Phase Identification of Layered GaS by Polarization-Dependent Angle-Resolved Oblique Incident Second Harmonic Generation
Layered gallium sulfide (GaS), a material that has attracted much attention in the field of micro-nano optoelectronics recently, is predicted to have four stable stacking orders (β-, γ-, ε-, and δ-GaS) with close formation energies; β-GaS is the most considered, and other phases are seldom discussed. However, considering the ease of the phase transition in few-layer materials, the lack of accurate crystal phase identification prevents a full understanding of this material for specific applications requiring other crystal phases. Here, we report a novel in situ and nondestructive method to identify the phase of layered GaS by polarization-dependent angle-resolved oblique incident second harmonic generation (SHG). Through this method, we discovered the presence of γ-GaS with a portion of approximately one-sixth of the total samples. Our work has laid a foundation for the application of GaS, and our approach has established a technical guarantee for structural analysis of van der Waals layered materials.
Authors
- Rongkuan Leng (ORCID: https://orcid.org/0000-0002-1579-9586)
- Liujian Qi (ORCID: https://orcid.org/0000-0001-6090-304X)
- Mingxiu Liu (ORCID: https://orcid.org/0000-0003-3998-0491)
- Weiheng Zhong (ORCID: https://orcid.org/0000-0002-7902-3568)
- Hanyu Zhang (ORCID: https://orcid.org/0000-0002-3057-0843)
- Zhongling Lang (ORCID: https://orcid.org/0000-0002-8301-3629)
- Ying Song (ORCID: https://orcid.org/0000-0003-1812-7811)
- Jinluo Cheng (ORCID: https://orcid.org/0000-0003-4875-9342)
- Xingang Zhao (ORCID: https://orcid.org/0000-0001-5817-4044)
- Shaojuan Li (ORCID: https://orcid.org/0000-0002-0504-2934)
- Wei Xin (ORCID: https://orcid.org/0000-0002-1887-7535)
- Kainan Chang (ORCID: https://orcid.org/0000-0002-1530-9022)
- Yanchao Wang
- Weiming Wang
- Yuwei Shan (ORCID: https://orcid.org/0000-0001-7890-6214)
- Zhilin Gong
- Jiawei Jing
Institutions
- Northeast Normal University (CN)
- Chinese Academy of Sciences (CN)
- Changchun Institute of Optics, Fine Mechanics and Physics (CN)
- Ministry of Education (ET)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-03-27
- DOI
- https://doi.org/10.1021/acs.nanolett.5c00345
- Primary Topic
- Photorefractive and Nonlinear Optics
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Natural Science Foundation of Jilin Province
- National Natural Science Foundation of China
- Education Department of Jilin Province
- Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences