Switching-on quantum size effects in silicon nanocrystals

Authors

Wei Sun, University of Toronto
Chenxi Qian, University of Toronto
Liwei Wang, Nankai University, University of Toronto
Muan Wei, University of Toronto
Melanie L. Mastronardi, University of Toronto
Gilberto Casillas, University of WollongongFollow
Josef Breu, Universitat Bayreuth
Geoffrey A. Ozin, University of Toronto

RIS ID

96434

Publication Details

Sun, W., Qian, C., Wang, L., Wei, M., Mastronardi, M. L., Casillas, G., Breu, J. & Ozin, G. A. (2015). Switching-on quantum size effects in silicon nanocrystals. Advanced Materials, 27 (4), 746-749.

Abstract

The size-dependence of the absolute luminescence quantum yield of size-separated silicon nanocrystals reveals a "volcano" behavior, which switches on around 5 nm, peaks at near 3.7-3.9 nm, and decreases thereafter. These three regions respectively define: i) the transition from bulk to strongly quantum confined emissive silicon, ii) increasing confinement enhancing radiative recombination, and iii) increasing contributions favoring non-radiative recombination.