1.Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
2.Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
3.Department of Electrical Engineering and Computer Science, University of Michigan, 2200 Bonisteel Blvd, Ann Arbor, MI 48109, USA
4.Ioffe Institute, Russian Academy of Sciences, 26 Polytechnicheskaya, 194021 St Petersburg, Russia
EMLD de Jong, Email: E.M.L.D.deJong@uva.nl
纸质出版日期:2018,
网络出版日期:2018-01-26,
收稿日期:2017-04-27,
修回日期:2017-09-14,
录用日期:2017-09-15
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Thermally stimulated exciton emission in Si nanocrystals[J]. LSA, 2018,7(1):17133-7.
de Jong, E. M. L. D. et al. Thermally stimulated exciton emission in Si nanocrystals. Light: Science & Applications, 1, 17133 (2018).
Thermally stimulated exciton emission in Si nanocrystals[J]. LSA, 2018,7(1):17133-7. DOI: 10.1038/lsa.2017.133.
de Jong, E. M. L. D. et al. Thermally stimulated exciton emission in Si nanocrystals. Light: Science & Applications, 1, 17133 (2018). DOI: 10.1038/lsa.2017.133.
Increasing temperature is known to quench the excitonic emission of bulk silicon
which is due to thermally induced dissociation of excitons. Here
we demonstrate that the effect of temperature on the excitonic emission is reversed for quantum-confined silicon nanocrystals. Using laser-induced heating of silicon nanocrystals embedded in SiO
2
we achieved a more than threefold (
>
300%) increase in the radiative (photon) emission rate. We theoretically mod
eled the observed enhancement in terms of the thermally stimulated effect
taking into account the massive phonon production under intense illumination. These results elucidate one more important advantage of silicon nanostructures
illustrating that their optical properties can be influenced by temperature. They also provide an important insight into the mechanisms of energy conversion and dissipation in ensembles of silicon nanocrystals in solid matrices. In practice
the radiative rate enhancement under strong continuous wave optical pumping is relevant for the possible application of silicon nanocrystals for spectral conversion layers in concentrator photovoltaics.
micro-photoluminescencenanocrystaloptical spectroscopysiliconthermal
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