Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
Phys Chem Chem Phys. 2014 Dec 14;16(46):25273-9. doi: 10.1039/c4cp02966f. Epub 2014 Sep 22.
Nano-silicon is a nanostructured material in which quantum or spatial confinement is the origin of the material's luminescence. When nano-silicon is broken into colloidal crystalline nanoparticles, its luminescence can be tuned across the visible spectrum only when the sizes of the nanoparticles, which are obtained via painstaking filtration methods that are difficult to scale up because of low yield, vary. Bright and tunable colloidal amorphous porous silicon nanostructures have not yet been reported. In this letter, we report on a 100 nm modulation in the emission of freestanding colloidal amorphous porous silicon nanostructures via band-gap engineering. The mechanism responsible for this tunable modulation, which is independent of the size of the individual particles and their distribution, is the distortion of the molecular orbitals by a strained silicon-silicon bond angle. This mechanism is also responsible for the amorphous-to-crystalline transformation of silicon.
纳米硅是一种纳米结构材料，其中量子或空间限制是材料发光的起源。当纳米硅被分解为胶体结晶纳米粒子时，只有当通过难以扩大规模的费力过滤方法获得的纳米粒子的尺寸变化时，其发光才能在整个可见光谱范围内进行调整，因为产量低。尚未报道明亮且可调谐的胶体非晶多孔硅纳米结构。在这封信中，我们报告了通过能带工程对独立胶体非晶多孔硅纳米结构的发射进行 100nm 调制。负责这种可调谐调制的机制与单个颗粒的大小及其分布无关，是由应变硅-硅键角引起的分子轨道的变形。这种机制也是硅非晶-晶相转变的原因。
