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In this paper a systematic and detailed study on the photophysical behavior of silicon nanocrystals (alkyl-capped, surface oxidized, oxide-encapsulated) is presented in order to elucidate the influence of local environment and surface species on the luminescence properties. Experiments at different temperatures – ranging from room temperature (RT) to 7 K – confirmed the important influence of the silicon nanocrystal (ncSi) surface on the photoluminescence (PL). Our comparative study of ncSi embedded in different matrices shows a strong increase of the exciton lifetimes at low temperature and the dominant widening of the bandgap for small ncSi after deactivation of traps below 100-150K. The present findings have significant implications for the use of ncSi in optoelectronic and biomedical applications, since they show that surface oxidation can occur in ligand-capped ncSi which limits the accessible emission wavelength for these applications to the orange/red spectral region when current passivation strategies are used.
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| Authors: | Florian Maier-Flaig, Eric J. Henderson, Sebastian Valouch, Sönke Klinkhammer, Christian Kübel, Geoffrey A. Ozin, Uli Lemmer | |
| Journal: | Chemical Physics | |
| Year: | 2012 | |
| DOI: | 10.1016/j.chemphys.2012.07.009 | |
| Publication date: | 06-08-2012 |
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