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New functional material: spark plasma sintered Si/SiO2 nanoparticles – fabrication and properties

机译：新型功能材料：火花等离子体烧结的Si / SiO2纳米粒子-制备和性能

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A bulk nanostructured material based on oxidized silicon nanopowder was fabricated using a spark plasma sintering technique. Structural investigations revealed that this material has the composition of ～14 nm core Si granules inside an SiO _(2) shell. Photoluminescence measurements have shown that the emission spectra lie in the energy range of 0.6–1.1 eV, which is not typical of the emissions of the Si/SiO _(2) nanostructures reported in numerous papers. This result can be explained by the formation of energy states in the bandgap and the participation of these states in both electronic transport and photoluminescence emission. Annealing of the sample leads to a decrease in defect density, which in turn leads to quenching of the 0.6–1.1 eV photoluminescence. In this case ～1.13 eV inter-band transitions in the Si core start to play a dominant role in radiative recombination. Thus, the possibility of controlling the photoluminescence emission over a broad wavelength range was demonstrated.
机译：使用火花等离子体烧结技术制造了基于氧化硅纳米粉的块状纳米结构材料。结构研究表明，这种材料在SiO _（2）壳内部具有约14 nm的核心Si颗粒组成。光致发光测量表明，发射光谱处于0.6–1.1 eV的能量范围内，这不像许多论文中报道的Si / SiO _（2）纳米结构的发射所典型。该结果可以通过带隙中能量态的形成以及这些态参与电子传输和光致发光发射来解释。样品的退火导致缺陷密度的降低，进而导致0.6-1.1 eV的光致发光猝灭。在这种情况下，Si核中〜1.13 eV的带间跃迁开始在辐射复合中起主要作用。因此，证明了在较宽的波长范围内控制光致发光发射的可能性。

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