Journal of Experimental and Theoretical Physics
HOME | SEARCH | AUTHORS | HELP      
Journal Issues
Golden Pages
About This journal
Aims and Scope
Editorial Board
Manuscript Submission
Guidelines for Authors
Manuscript Status
Contacts


ZhETF, Vol. 145, No. 5, p. 830 (May 2014)
(English translation - JETP, Vol. 118, No. 5, p. 728, May 2014 available online at www.springer.com )

EFFECT OF SURFACE Si-Si DIMERS ON PHOTOLUMINESCENCE OF SILICON NANOCRYSTALS IN THE SILICON DIOXIDE MATRIX
Gusev O.B., Ershov A.V., Grachev D.A., Andreev B.A., Yablonskiy A.N.

Received: November 27, 2013

DOI: 10.7868/S0044451014050061

DJVU (161.8K) PDF (324.2K)

The effect of surface states of silicon nanocrystals embedded in silicon dioxide on the photoluminescent properties of the nanocrystals is reported. We have investigated the time-resolved and stationary photoluminescence of silicon nanocrystals in the matrix of silicon dioxide in the visible and infrared spectral ranges at 77 and 300 K. The structures containing silicon nanocrystals were prepared by the high-temperature annealing of multilayer SiOx/ SiO2 films. The understanding of the experimental results on photoluminescence is underlain by a model of autolocalized states arising on surface Si-Si dimers. The emission of autocatalized excitons is found for the first time, and the energy level of the autolocalized states is determined. The effect of these states on the mechanism of the excitation and the photoluminescence properties of nanocrystals is discussed for a wide range of their dimensions. It is reliably shown that the cause of the known blue boundary of photoluminescence of silicon nanocrystals in the silicon dioxide matrix is the capture of free excitons on autolocalized surface states.

 
Report problems