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Luminescent silicon nanoparticles formed in solution.

¹Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.

Journal of Nanoscience and Nanotechnology

|May 13, 2008

Summary

This review explores wet-chemical synthesis of silicon nanoparticles (Si NPs). Researchers discuss tuning their photoluminescence (PL) via size control and investigate the origins of Si NP PL, debating surface states versus band-edge modifications.

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Area of Science:

Materials Science
Nanotechnology
Physical Chemistry

Background:

Silicon nanoparticles (Si NPs) exhibit tunable photoluminescence (PL) properties.
Understanding the origin of Si NP PL is crucial for their application.
Wet-chemical synthesis offers versatile routes for Si NP preparation.

Purpose of the Study:

To review wet-chemical methods for synthesizing Si nanoparticles.
To discuss the factors influencing the photoluminescence of Si nanoparticles.
To explore the debated origins of photoluminescence in Si nanoparticles.

Main Methods:

Dispersion from porous silicon.
Etching and surface functionalization of Si/SiO2 powders.
Direct chemical reaction of silicon precursors.

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Main Results:

Photoluminescence of Si NPs can be tuned across the visible spectrum by controlling particle size.
The excitonic origin of PL in Si NPs is generally accepted.
Debate exists regarding the PL redshift mechanism: localized surface states versus modified band-edge states in oxide-passivated NPs.

Conclusions:

Wet-chemical routes provide effective methods for Si NP preparation with tunable optical properties.
The precise mechanism for the photoluminescence redshift in small Si NPs remains an active area of research.
Further investigation is needed to definitively distinguish between surface state and band-edge modification models for Si NP photoluminescence.