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Influence of etching and surface functionalization on the optical property of luminescing phosphorus doped silicon nanoparticles

A. GUPTA1,* , C. SCHULZ1,2, H. WIGGERS1,2,*

Affiliation

  1. Institute for Combustion and Gasdynamics (IVG), University of Duisburg-Essen, Duisburg, Germany
  2. Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Duisburg, Germany

Abstract

In this study, we investigated the photoluminescence (PL) behavior of phosphorus-doped silicon nanoparticles (P-doped SiNPs) after etching and surface functionalization processes. Si-NPs were synthesized in a low-pressure microwave plasma reactor via pyrolysis of silane (SiH4). Doping of phosphorus into Si-NPs was carried out by injection of phosphine during the gas-phase synthesis of Si-NPs. The emission of P-doped Si-NPs was tuned from red to blue by etching them in a mixture of hydrofluoric acid (HF) and nitric acid (HNO3) for different times. Air oxidation of freshly etched NPs causes a blue shift in the emission spectra and decreasing intensity. Surface functionalization of etched NPs also alters their emission wavelength; however, functionalized NPs show stable bright emission for several months..

Keywords

Doped silicon nanoparticles, Surface functionalization, Photoluminescence, FTIR spectroscopy.

Submitted at: June 21, 2009
Accepted at: Feb. 27, 2010

Citation

A. GUPTA, C. SCHULZ, H. WIGGERS, Influence of etching and surface functionalization on the optical property of luminescing phosphorus doped silicon nanoparticles, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 3, pp. 518-522 (2010)