拉曼光谱
材料科学
硅烷
硅
无定形固体
分析化学(期刊)
红外光谱学
纳米晶硅
透射电子显微镜
非晶硅
晶体硅
结晶学
纳米技术
化学
光学
复合材料
光电子学
物理
有机化学
色谱法
作者
Joydeep Dutta,Wolfgang Bacsa,Ch. Hollenstein
摘要
Silicon powders produced in a low pressure silane plasma show varying structural properties depending on the location of collection of the powders in the reactor. This is revealed by high resolution transmission electron microscopy, infrared and Raman spectroscopy. The particulates are found to consist either of heterogeneously distributed amorphous and crystalline phases or of nanoscale particles with amorphous and molecular like spectral features as found from the Raman spectroscopic studies. Infrared spectra show clustered silicon-hydrogen phases and the presence of oxidized phases in the powder, upon exposure to atmosphere. Phonon confinement effects due to the nanometer size and expansive strain is observed in the vibrational Raman spectra. The average particle size estimated from the observed phonon quantum confinement corresponds with the particle sizes observed by high resolution electron microscopy if strain contributions are included. Annealing at temperatures as low as 300 °C leads to Raman vibrational band similar to crystalline silicon.
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