A Review on Metastable Silicon Allotropes
Abstract
:1. Introduction
2. Known Metastable Phases of Silicon
2.1. The Metastable Phases under Slow Decompressure Rate (Si(cI16), Si(), and Si(hP4))
2.2. The Metastable Phases under Fast Decompressure Rate (Si(tP32) and Si-IX)
2.3. Low-Pressure Tetragonal Allotropes (Si(tI16) and Si(tP12))
2.4. Low-Density Si Clathrates (Si(cF136), Si(oC24), and Si(cP46))
3. Pathways to Exotic Metastable Silicon Allotropes
3.1. Top-Down Approach
3.1.1. Diamond Anvil Cell Method (DAC)
3.1.2. Indentation Method
3.1.3. Laser-Induced Method
3.1.4. Metal-Assisted Chemical Etching Method
3.1.5. Shear-Drive Method
3.1.6. Ball Milling Method
3.1.7. Metal-Induced Crystallization Method (MIC)
3.2. Bottom-Up Approach
3.2.1. Wet Chemistry Method
3.2.2. Chemical Vapor Deposition Method
4. Challenges and Perspectives for the Field
4.1. The Key Troubles
4.2. Research Trends
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Label | Space Group | Pearson Symbol | Structure | Main Raman Band (cm−1) | Relative Energy (eV/atom) |
---|---|---|---|---|---|
Si-I, DC-Si | Fdm | cF8 | Cubic | 520 | 0 |
Si-XII, R8-Si | R | hR24 | Rhombohedral | 352 | 0.16 |
Si-III, BC8-Si | Ia | cI16 | body-centered cubic | 438 | 0.159 |
Si-IV, HD-Si | P63/mmc | hP4 | hexagonal diamond | 515~517 | 0.011 |
Si-XIII | P42/ncm P41212 | tP12/tP20 | Tetragonal | 475 | 0.045/0.041 |
Si-VIII, t32/t32*-Si | P21C P43212 | tP32 | Tetragonal | - | 0.163/0.164 |
BT8-Si | I41/a | tI16 | Body-centered tetragonal | - | 0.146 |
ST12-Si | P43212 | tP12 | Simple tetragonal | - | 0.139 |
Si24 | Cmcm | oC24 | Orthorhombic | - | 0.09 |
Si46 | Pmn | cP46 | Cubic | - | 0.067 |
Si136 | Fdm | cF136 | Face-centered cubic | 487 | 0.052 |
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Fan, L.; Yang, D.; Li, D. A Review on Metastable Silicon Allotropes. Materials 2021, 14, 3964. https://doi.org/10.3390/ma14143964
Fan L, Yang D, Li D. A Review on Metastable Silicon Allotropes. Materials. 2021; 14(14):3964. https://doi.org/10.3390/ma14143964
Chicago/Turabian StyleFan, Linlin, Deren Yang, and Dongsheng Li. 2021. "A Review on Metastable Silicon Allotropes" Materials 14, no. 14: 3964. https://doi.org/10.3390/ma14143964