Current-less anodization of intrinsic silicon powder grains: Formation of fluorescent Si nanoparticles

Abstract

We examine current-less anodization of Si powder grains which are dispersed in a liquid. The grains are prepared red luminescent using a platinum catalyst from a chloroplatinic acid precursor. We also use the procedure to form dispersions of fluorescent Si nanoparticles in the size range of 3–6 nm across by subsequent sonication of the grains. The results are discussed in terms of the calculated thickness of the depletion layer in the grains due to a light metal doping and compared with recent results for the anodization of wirelike geometry.

Optical Properties of Porous Silicon*

“…Nielsen et al (2007) deposited Pt from solution on Si powder grains, which were dispersed in an aqueous mixture of HF and H 2 PtCl 6 for 15 min. This procedure produced dispersions of photoluminescent Si nanoparticles in the size range of 3-6 nm after sonication of the grains in iso-propanol.…”

∼23% increase in efficiency of 100 nm thin film a-si solar cells using combination of Si/InN and Au nanoparticles

“…1. More details of the Si NPs can be found here [8][9][10][11]. The generation of InN NPs was carried out using a nanosecond pulsed ND:YLF laser.…”

“… 10. shows the percentage increase in efficiency and short circuit current by all the nanoparticles coated cells compared to reference cell.…”

Wideband luminescence from bandgap-matched Mg-based Si core-shell geometry nanocomposite

“…We used ultra-small Si nanoparticles [27][28][29][30][31] with Si-H termination. The nanoparticles are prepared from Si wafers by chemical etching in HF and H 2 O 2 using electrical or hexachloroplatinic acid catalyst.…”