Influence of preparation parameters on the particle size of nanosized silicon

Interfacial Charge Carrier Dynamics of Colloidal Semiconductor Nanoparticles

“…Preparation of Si NPs is more involved, − and there are no simple wet chemistry methods available for making Si NPs at this point. In general, colloidal nanoparticles of semiconductors with more covalent chemical bonding are more difficult to make than those with ionic bonding …”

“…The weak luminescence of bulk silicon presents a major obstacle to its use for the fast-growing optoelectronics industry. The discovery in 1990 that porous and nanocrystalline Si emit visible light with high quantum yield has raised hopes for new photonic devices based on silicon and stimulated strong research interest in porous silicon and Si nanoparticles. − ,− Various methods have been used to make Si nanoparticles, including slow combustion of silane, reduction of SiCl 4 by Na, separation from porous Si following HF acid electrochemical etching, − microwave discharge, laser vaporization/controlled condensation, high-pressure aerosol reaction, laser-induced chemical vapor deposition, and chemical vapor deposition . Si NPs are difficult to make using wet colloidal chemistry techniques.…”

Optical Properties of Semiconductor Nanomaterials

“…The band structure of nanomaterials is generally not as well characterized as with bulk materials. One example is silicon nanoparticles for which there have been intensive debates over the observed luminescence on if it originates from surface effect or fundamental changes in electronic band structure, from indirect in bulk to direct on the nanoscale [25][26][27][28][29][30][31]. It is most likely that the luminescence from nanostructured silicon was partly due to surface effect, especially the red emission, and partly due to quantum confinement (electronic structure change), especially the bluer emission.…”

“…The discovery that porous and 138 Optical Properties and Spectroscopy of Nanomaterials nanocrystalline Si emit visible light with high quantum yield in 1990 [78] has raised hopes for new photonic devices based on silicon and stimulated strong research interest in porous silicon and Si nanoparticles [25-31, 79, 80]. Various methods have been used to make Si nanoparticles, including slow combustion of silane [29], reduction of SiCl 4 by Na [81], separation from porous Si following HF acid electrochemical etching [82][83][84], microwave discharge [85], laser vaporization/controlled condensation [25], high pressure aerosol reaction [26], decomposition of alkyl silanes [86], laser-induced chemical vapor deposition [28], ball milling [87], chemical vapor deposition [27], and various other solutionbased methods [88][89][90][91]. Si NPs are usually difficult to make using conventional wet colloidal chemistry techniques.…”

Effects of Synthesis Parameters on Silicon Nanopowders Produced by CO2 Laser‐Driven Pyrolysis of Silane

“…Botti and co‐workers investigated the influence of reactor pressure and silane dilution percentages on particle size using transmission electron microscopy (TEM) and small‐angle neutron scattering (SANS) . Wang et al carried out research on the influence of laser intensity, SiH 4 flow, and chamber pressure on silicon nanoparticle size in both theory and experiment . Nevertheless, to our knowledge, systematic discussions have not yet been explored.…”