Photoluminescence properties of porous silicon nanocomposites
نویسندگان
چکیده
Different porous silicon (PS) layers were impregnated with rhodamine 6G (Rh) solution in order to form Rh/PS nanocomposites. The effect of the porous matrix (fresh, oxidised, type p) on the propriety of photoluminescence (PL) has been investigated. It was found that the luminescence of this nanocomposite is provided by an energy transfer from PS nanocristallites to rhodamine and from interaction of dye molecules with the chemical species on the Si surface. An antistokes PL has been observed using a He–Ne laser excitation. The dependence of its intensity via power excitation suggests a process of two-step two-photon absorption as origin of this PL. Nanocomposite formed by PS and ZnO has been also investigated. We show that this transparent oxide does not degrade the skeleton of PS and does not inhibit PL. The PL band shifts to high energy and the intensity becomes stable providing the passivation of the dangling bonds on the Si-surface by ZnO. © 2001 Elsevier Science S.A. All rights reserved. www.elsevier.com/locate/mseb
منابع مشابه
ZnO-porous silicon nanocomposite for possible memristive device fabrication
Preliminary results on the fabrication of a memristive device made of zinc oxide (ZnO) over a mesoporous silicon substrate have been reported. Porous silicon (PS) substrate is employed as a template to increase the formation of oxygen vacancies in the ZnO layer and promote suitable grain size conditions for memristance. Morphological and optical properties are investigated using scanning electr...
متن کاملبررسی خواص پراکندگی سیلیکان متخلخل
Porous silicon (PS) layers come into existance as a result of electrochemical anodization on silicon. Although a great deal of research has been done on the formation and optical properties of this material, the exact mechanism involved is not well-understood yet. In this article, first, the optical properties of silicon and porous silicon are described. Then, previous research and the prop...
متن کاملElectronic states and luminescence in higher fullerene/porous Si nanocrystal composites.
Photoluminescence (PL) measurements have been performed on the nanocomposites of higher fullerene-coupled porous silicon (PS) nanocrystals. For the C70PS and C76(78)PS nanocomposites, the PL spectra show a pinning wavelength at approximately 565 nm and for the C84PS and C94PS nanosystems the pinning wavelength is at approximately 590 nm. The PL pinning property is closely related to the sorts o...
متن کاملControl capability of electrolytic concentration on refractive index and dielectric constant of porous Silicon layers
Porous Silicon (PS) samples have been prepared by electrochemical anodization of p-type silicon wafer by varying HF concentrations in the electrolytic solution. The structural, surface morphological, optical and surface composition analysis of the prepared samples were done by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Photoluminescence (PL) and Fourier transform infr...
متن کاملControl capability of electrolytic concentration on refractive index and dielectric constant of porous Silicon layers
Porous Silicon (PS) samples have been prepared by electrochemical anodization of p-type silicon wafer by varying HF concentrations in the electrolytic solution. The structural, surface morphological, optical and surface composition analysis of the prepared samples were done by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Photoluminescence (PL) and Fourier transform infr...
متن کامل