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Red spectral shift and enhanced quantum efficiency in phonon-free photoluminescence from silicon nanocrystals
Authors
A Alivisatos
A Brewer
+48 more
A Pandey
A Puzder
A Shabaev
AA Prokofiev
AG Cullis
AS Moskalenko
B Delley
D Babić
D Jurbergs
D Kovalev
D Timmerman
D. Timmerman
F Trojánek
G Allan
G Ledoux
GF Grom
H. Zhang
HS Rong
I. N. Yassievich
J Liu
J Valenta
J-H Park
J-W Luo
JH Stathis
JR Walters
K. Dohnalová
L Pavesi
L Tsybeskov
L-W Wang
M Achermann
M Ben-Chorin
M Sykora
MC Beard
MV Rama Krishna
MV Wolkin
P Schmidt
RD Schaller
S Godefroo
S Rao
S Takeoka
SG Cloutier
T. Gregorkiewicz
VA Belyakov
W. D. A. M. de Boer
W. J. Buma
WL Wilson
Y Kanemitsu
Y Kanzawa
Publication date
1 January 2010
Publisher
'Springer Science and Business Media LLC'
Doi
Cite
Abstract
Crystalline silicon is the most important semiconductor material in the electronics industry. However, silicon has poor optical properties because of its indirect bandgap, which prevents the efficient emission and absorption of light. The energy structure of silicon can be manipulated through quantum confinement effects, and the excitonic emission from silicon nanocrystals increases in intensity and shifts to shorter wavelengths (a blueshift) as the size of the nanocrystals is reduced. Here we report experimental evidence for a short-lived visible band in the photoluminescence spectrum of silicon nanocrystals that increases in intensity and shifts to longer wavelengths (a redshift) with smaller nanocrystal sizes. This higher intensity indicates an increased quantum efficiency, which for 2.5-nm-diameter nanocrystals is enhanced by three orders of magnitude compared to bulk silicon. We assign this band to the radiative recombination of non-equilibrium electron-hole pairs in a process that does not involve phonons. © 2010 Macmillan Publishers Limited. All rights reserved
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