Influence of the surrounding host in obtaining tunable and strong visible photoluminescence from silicon nanoparticles

Abstract

Articles you may be interested inDistinguishing the effect of surface passivation from the effect of size on the photonic and electronic behavior of porous siliconWe have investigated the influence of the microstructure and chemistry of the surrounding host on the strong visible photoluminescence ͑PL͒ from silicon nanoclusters ͑nc-Si͒ embedded in three different silicon-based dielectric compounds: Si x N y : H , Cl, Si x N y O z : H , Cl, and Si x O z :H,Cl, obtained from silicon nitride films deposited by SiH 2 Cl 2 /NH 3 /H 2 plasma-enhanced chemical vapor deposition at different growth pressures. A blueshift is found in the PL coming from the nc-Si as the content of oxygen in the surrounding host is increased, and a significant improvement in PL intensity is achieved when the nc-Si are well passivated with O instead of H. We discuss the PL behavior in terms of the quantum confinement model and passivation state of the nc-Si surface.

Photoluminescence properties of SiNx/Si amorphous multilayer structures grown by plasma-enhanced chemical vapor deposition

“…1 shows, the confinement of the nc-Si in this type of structures occurs mainly in the direction perpendicular to the surface of the layers. According to this and since the use of dichlorosilane favors low hydrogen content and crystallinity of the nc-Si [7,10], the 1D (one-dimensional)-QCE model given by the equation E peak ¼ 1:16 þ 3:9=d 2 can be used to correlate the main PL peaks (E peak ) with the nc-Si layer thicknesses (d) [12,13]. Thus, the two main peaks of the PL spectra for the as-grown samples (Fig.…”

Enhancement and quenching of photoluminescence from silicon quantum dots by silver nanoparticles in a totally integrated configuration

“…7, where the depth profile of the samples are shown. The SIMNRA code also allows the determination of the Ag fluence of the three samples implanted with Ag at 1, 2 and 3 MeV, whose results are 4.44×10 16 Ag/cm 2 , 3.00×10 16 Ag/cm 2 and 4.24 ×10…”

“…Besides, it has been well established that metallic nanoparticles, such as Ag and Au, support surface plasmon resonance (SPR), which can be tuned throughout the UV-vis-near-IR spectrum by controlling their shape, size and their local dielectric environment. [12][13][14][15] There are many ways to fabricate nanocrystalline silicon, such as plasma enhanced chemical vapor deposition (PECVD), remote-PECVD (RPECVD), 4,16,17 implantation. 6,18,19 In this work we have used the ion implantation technique to obtain a totally integrated configuration formed by Si QDs and silver nanoparticles (Ag NPs).…”

Structural evolution of nanocrystalline silicon studied by high resolution transmission electron microscopy

“…The photoluminescence (PL) obtained in nc-Si and porous silicon is associated with quantum confinement effects in which the position of the PL energy peak depends fundamentally on the nc-Si size and the surrounding host [2][3][4][5]. The nc-Si can be embedded in a dielectric amorphous thin films (SiO, SiN, and SiON), which are deposited onto silicon substrates.…”