Two dimensional silicon chalcogenides with high carrier mobility for photocatalytic water splitting
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2018
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909316943970304 |
|---|---|
| author | Zhu, Yun-Lai Yuan, Jun-Hui Song, Ya-Qian Wang, Sheng Xue, Kan-Hao Xu, Ming Cheng, Xiao-Min Miao, Xiang-Shui |
| author_facet | Zhu, Yun-Lai Yuan, Jun-Hui Song, Ya-Qian Wang, Sheng Xue, Kan-Hao Xu, Ming Cheng, Xiao-Min Miao, Xiang-Shui |
| contents | Highly-efficient water splitting based on solar energy is one of the most attractive research focuses in the energy field. Searching for more candidate photocatalysts that can work under visible-light irradiation are highly demanded. Herein, using first principle calculations based on density functional theory, we predict that the two dimensional silicon chalcogenides, i.e. SiX (X=S, Se, Te) monolayers, as semiconductors with 2.43 eV~3.00 eV band gaps, exhibit favorable band edge positions for photocatalytic water splitting. The optical adsorption spectra demonstrate that the SiX monolayers have pronounced optical absorption in the visible light region. Moreover, the band gaps and band edge positions of silicon chalcogenides monolayers can be tuned by applying biaxial strain or increasing the number of layers, in order to better fit the redox potentials of water. The combined novel electronic, high carrier mobility, and optical properties render the two dimensional SiX a promising photocatalyst for water splitting. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1810_11997 |
| institution | arXiv |
| publishDate | 2018 |
| record_format | arxiv |
| spellingShingle | Two dimensional silicon chalcogenides with high carrier mobility for photocatalytic water splitting Zhu, Yun-Lai Yuan, Jun-Hui Song, Ya-Qian Wang, Sheng Xue, Kan-Hao Xu, Ming Cheng, Xiao-Min Miao, Xiang-Shui Materials Science Highly-efficient water splitting based on solar energy is one of the most attractive research focuses in the energy field. Searching for more candidate photocatalysts that can work under visible-light irradiation are highly demanded. Herein, using first principle calculations based on density functional theory, we predict that the two dimensional silicon chalcogenides, i.e. SiX (X=S, Se, Te) monolayers, as semiconductors with 2.43 eV~3.00 eV band gaps, exhibit favorable band edge positions for photocatalytic water splitting. The optical adsorption spectra demonstrate that the SiX monolayers have pronounced optical absorption in the visible light region. Moreover, the band gaps and band edge positions of silicon chalcogenides monolayers can be tuned by applying biaxial strain or increasing the number of layers, in order to better fit the redox potentials of water. The combined novel electronic, high carrier mobility, and optical properties render the two dimensional SiX a promising photocatalyst for water splitting. |
| title | Two dimensional silicon chalcogenides with high carrier mobility for photocatalytic water splitting |
| topic | Materials Science |
| url | https://arxiv.org/abs/1810.11997 |