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Effect of Surface Passivation on Stability of Luminescence from Nanocrystalline Silicon Particles in Pure Water

Published online by Cambridge University Press:  01 February 2011

Masaki Hiruoka ,
Keisuke Sato  and
Kenji Hirakuri
Masaki Hiruoka
Affiliation:
Tokyo Denki University, Department of Electronic and Computer Engineering, Ishizaka, Hatoyama, Hikigun, Saitama, 350-0394, Japan, +81-49-296-2911, +81-49-296-6413
Keisuke Sato
Affiliation:
sato@f.dendai.ac.jp, Tokyo Denki University, Department of Electronic and Computer Engineering, Ishizaka, Hatoyama, Hiki gun, Saitama, 350-0394, Japan
Kenji Hirakuri
Affiliation:
hirakuri@f.dendai.ac.jp, Tokyo Denki University, Department of Electronic and Computer Engineering, Ishizaka, Hatoyama, Hikigun, Saitama, 350-0394, Japan
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Abstract

We have investigated the stability of luminescence in pure water from a nanocrystalline silicon (nc-Si) particles passivated with various chemical elements such as a hydrogen, carbon and oxygen atoms. Each sample emitted red light with a peak wavelength in a range from 690 to 800 nm. When the hydrogen- and/or carbon-passivated samples were immersed in pure water, the intensity of red luminescence was decreased by aging after a short period of time. At the same time, the peak wavelength was also shifted toward shorter wavelength. These were caused by the generation of defects (Pb-centers) and the reduction of particle size due to the desorption of hydrogen and/or carbon atoms and the replacement from the Si-H and/or Si-C bonds to the Si-O bond, respectively, at the surface of nc-Si particles. On the other hand, the oxygen-passivated sample showed stable luminescence in addition to the slight blue-shift of peak wavelength under the immersion in pure water for 400 hours. The good stability was attributed to the formation of stable surface condition. These results are a strong indication that the stability of the luminescence in pure water can be remarkably improved by the oxygen-passivation to the surface of nc-Si particles.

Keywords

nanostructureoptical propertieschemical reaction
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 958: Symposium L – Group IV Semiconductor Nanostructures—2006 , 2006 , 0958-L10-22
Copyright
Copyright © Materials Research Society 2007

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