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Raman spectra of Si nanocrystals under high pressure: Metallization and solid state amorphization
Applied Physics Letters ( IF 3.5 ) Pub Date : 2020-02-10 , DOI: 10.1063/1.5145246
N. N. Ovsyuk 1 , S. G. Lyapin 2
Affiliation  

We have observed and identified two crystalline peaks at ∼270 cm−1 and ∼400 cm−1 in nanocrystalline silicon during both compression and decompression. We attribute the first peak to the orthorhombic Imma phase (Si-XI) and the second one to the TO mode of the silicon metallic β-Sn phase (Si-II). Also, in the process of decompression, we observed a first-order-like transition from a highly coordinated metallic crystalline β-Sn phase to the normal tetrahedral LDA phase of the amorphous semiconductor. When the pressure is completely relieved, the powder regains its initial crystalline structure, which suggests that the amorphous phase has retained some structural features of the parent crystalline phase.We have observed and identified two crystalline peaks at ∼270 cm−1 and ∼400 cm−1 in nanocrystalline silicon during both compression and decompression. We attribute the first peak to the orthorhombic Imma phase (Si-XI) and the second one to the TO mode of the silicon metallic β-Sn phase (Si-II). Also, in the process of decompression, we observed a first-order-like transition from a highly coordinated metallic crystalline β-Sn phase to the normal tetrahedral LDA phase of the amorphous semiconductor. When the pressure is completely relieved, the powder regains its initial crystalline structure, which suggests that the amorphous phase has retained some structural features of the parent crystalline phase.

中文翻译:

高压下硅纳米晶的拉曼光谱:金属化和固态非晶化

我们已经在压缩和减压过程中观察并确定了纳米晶硅中~270 cm-1 和~400 cm-1 处的两个结晶峰。我们将第一个峰归因于正交 Imma 相(Si-XI),第二个峰归因于硅金属 β-Sn 相(Si-II)的 TO 模式。此外,在减压过程中,我们观察到从高度配位的金属结晶 β-Sn 相到非晶半导体的正四面体 LDA 相的一级状转变。当压力完全释放时,粉末恢复其初始晶体结构,这表明非晶相保留了母晶相的一些结构特征。我们在~270 cm-1 和~400 cm 处观察并确定了两个结晶峰-1 在压缩和减压过程中的纳米晶硅中。我们将第一个峰归因于正交 Imma 相(Si-XI),第二个峰归因于硅金属 β-Sn 相(Si-II)的 TO 模式。此外,在减压过程中,我们观察到从高度配位的金属结晶 β-Sn 相到非晶半导体的正四面体 LDA 相的一级状转变。当压力完全释放时,粉末恢复其初始结晶结构,这表明非晶相保留了母晶相的一些结构特征。我们观察到从高度配位的金属结晶 β-Sn 相到非晶半导体的正常四面体 LDA 相的一级状转变。当压力完全释放时,粉末恢复其初始结晶结构,这表明非晶相保留了母晶相的一些结构特征。我们观察到从高度配位的金属结晶 β-Sn 相到非晶半导体的正常四面体 LDA 相的一级状转变。当压力完全释放时,粉末恢复其初始结晶结构,这表明非晶相保留了母晶相的一些结构特征。
更新日期:2020-02-10
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