The present comprehensive study of photoluminescence (PL) quantum yield (QY) of Si nanocrystals (SiNCs) in Si-rich oxynitride (SRON) superlattices was performed over a broad set of samples. The PL QY is sensitive mostly to the thickness of SRON and barrier oxide layers and to the passivation procedures. Annealing in hydrogen improves the QY proportionally to the NC surface area by passivating the NC/oxide interface defects present at a surface density of about 2.5 × 1012 cm−2. The maximum external QY of nearly 30% is found in well-passivated superlattices with a SiNC size of about 4 nm and a SiO2 barrier thickness of 2 nm or larger. We reveal the existence of an extended near-infrared tail of the PL spectra, whose weak intensity anti-correlates with the external QY. The relative intensity of this emission increases with temperature as well as for strong excitation above the PL saturation level and may be related to excitation energy transfer to the structural defects near NCs. Finally, we discuss the possible mechanisms which are responsible for limiting the attainable PL QY and which may be the subject of future efforts to further increase the PL QY.

1.
K.-Y.
Cheng
,
R.
Anthony
,
U. R.
Kortshagen
, and
R. J.
Holmes
,
Nano Lett.
11
,
1952
(
2011
).
2.
F.
Maier-Flaig
,
J.
Rinck
,
M.
Stephan
,
T.
Bocksrocker
,
M.
Bruns
,
C.
Kübel
,
A. K.
Powell
,
G. A.
Ozin
, and
U.
Lemmer
,
Nano Lett.
13
,
475
(
2013
).
3.
W.
Mu
,
P.
Zhang
,
J.
Xu
,
S.
Sun
,
J.
Xu
,
W.
Li
, and
K.
Chen
,
IEEE J. Sel. Top. Quantum Electron.
20
,
8200106
(
2014
).
4.
F.
Meinardi
,
S.
Ehrenberg
,
L.
Dhamo
,
F.
Carulli
,
M.
Mauri
,
F.
Bruni
,
R.
Simonuti
,
U.
Kortshagen
, and
S.
Brovelli
,
Nat. Photonics
11
,
177
(
2017
).
5.
X.
Pi
,
L.
Zhang
, and
D.
Yang
,
J. Phys. Chem. C
116
,
21240
(
2012
).
6.
Nanotechnology and Photovoltaic Devices: Light Energy Harvesting with Group IV Nanostructures
, edited by
J.
Valenta
and
S.
Mirabella
(
Pan Stanford Publishing
,
Singapore
,
2015
).
7.
K.
Dohnalová
,
T.
Gregorkiewicz
, and
K.
Kůsová
,
J. Phys.: Condens. Matter
26
,
173201
(
2014
).
8.
M. D.
Mason
,
G. M.
Credo
,
K. D.
Weston
, and
S. K.
Burrato
,
Phys. Rev. Lett.
80
,
5405
(
1998
).
9.
R.
Limpens
and
T.
Gregorkiewicz
,
J. Appl. Phys.
114
,
074304
(
2013
).
10.
11.
J.
Valenta
,
M.
Greben
,
Z.
Remes
,
S.
Gutsch
,
D.
Hiller
, and
M.
Zacharias
,
Appl. Phys. Lett.
108
,
023102
(
2016
).
12.
A. M.
Hartel
,
D.
Hiller
,
S.
Gutsch
,
P.
Löper
,
S.
Estradé
,
F.
Peiró
,
B.
Garrido
, and
M.
Zacharias
,
Thin Solid Films
520
,
121
(
2011
).
13.
A.
Hartel
,
S.
Gutsch
,
D.
Hiller
, and
M.
Zacharias
,
Phys. Rev. B
85
,
165306
(
2012
).
14.
S.
Gutsch
,
D.
Hiller
,
J.
Laube
,
M.
Zacharias
, and
C.
Kübel
,
Beilstein J. Nanotechnol.
6
,
964
(
2015
).
15.
J. R.
Lakowicz
,
Principles of Fluorescence Spectroscopy
, 3rd ed. (
Springer Science + Business Media LLC
,
2006
).
16.
B. G.
Lee
,
D.
Hiller
,
J.-W.
Luo
,
O. E.
Semonin
,
M. C.
Beard
,
M.
Zacharias
, and
P.
Stradins
,
Adv. Funct. Mater.
22
,
3223
(
2012
).
17.
R. A.
Street
,
Hydrogenated Amorphous Silicon
(
Cambridge University Press
,
Cambridge
,
1991
).
18.
D.
Timmerman
,
J.
Valenta
,
K.
Dohnalova
,
W. D. A. M.
de Boer
, and
T.
Gregorkiewicz
,
Nat. Nanotechnol.
6
,
710
(
2011
).
19.
M.
Jivanescu
,
D.
Hiller
,
M.
Zacharieas
, and
A.
Stesmans
,
Eur. Phys. Lett.
96
,
27003
(
2011
).
20.
C.
Delerue
,
G.
Allan
, and
M.
Lannoo
,
Phys. Rev. B
48
,
11024
(
1993
).
21.
J.
Valenta
,
M.
Greben
,
S.
Gutsch
,
D.
Hiller
, and
M.
Zacharias
,
Appl. Phys. Lett.
105
,
243107
(
2014
).
22.
S.
Hernández
,
J.
López-Vidrier
,
L.
López-Conesa
,
D.
Hiller
,
S.
Gutsch
,
J.
Ibáñez
,
S.
Estradé
,
F.
Peiró
,
M.
Zacharias
, and
B.
Garrido
,
J. Appl. Phys.
115
,
203504
(
2014
).
23.
G.
Ledoux
,
J.
Gong
,
F.
Huisken
,
O.
Guillois
, and
C.
Reynaud
,
Appl. Phys. Lett.
80
,
4834
(
2002
).
24.
A.
Sa'ar
,
J. Nanophotonics
3
,
032501
(
2009
).
25.
J. B.
Miller
,
A. R.
Van Sickle
,
R. J.
Anthony
,
D. M.
Kroll
,
U. R.
Kortshagen
, and
E. K.
Hobbie
,
ACS Nano
6
,
7389
(
2012
).
26.
D.
Jurbergs
,
E.
Rogojina
,
L.
Malgolini
, and
U.
Kortshagen
,
Appl. Phys. Lett.
88
,
233116
(
2006
).
27.
M. L.
Mastronardi
,
F.
Maier-Flaig
,
D.
Faulkner
,
E. J.
Henderson
,
C.
Kübel
,
U.
Lemmer
, and
G. A.
Ozin
,
Nano Lett.
12
,
337
(
2012
).
28.
X.
Liu
,
Y.
Zhang
,
T.
Yu
,
X.
Quiao
,
R.
Gresback
,
X.
Pi
, and
D.
Yang
,
Part. Part. Syst. Charact.
33
,
44
(
2016
).
29.
R.
Limpens
,
S. L.
Luxembourg
,
A. W.
Weeber
, and
T.
Gregorkiewicz
,
Sci. Rep.
6
,
19566
(
2016
).
30.
F.
Sangghaleh
,
I.
Sychugov
,
Z.
Yang
,
J. G. C.
Veinot
, and
J.
Linnros
,
ACS Nano
9
,
7097
(
2015
).
31.
R. J.
Walters
,
J.
Kalkman
,
A.
Polman
,
H. A.
Atwater
, and
M. J. A.
de Dood
,
Phys. Rev. B
73
,
132302
(
2006
).
33.
M.
Greben
,
P.
Khoroshyy
,
X.
Liu
,
X.
Pi
, and
J.
Valenta
,
J. Appl. Phys.
122
,
034304
(
2017
).
34.
S.
Miura
,
T.
Nakamura
,
M.
Fujii
,
M.
Inui
, and
S.
Hayashi
,
Phys. Rev. B
73
,
245333
(
2006
).
35.
S. O.
Morgan
and
W. A.
Yager
,
Ind. Eng. Chem.
32
,
1519
(
1940
).
36.
V. A.
Belyakov
,
V. A.
Burdov
,
R.
Lockwood
, and
A.
Meldrum
,
Adv. Opt. Technol.
2008
,
1
.
37.
I.
Sychugov
,
J.
Valenta
, and
J.
Linnros
,
Nanotechnology
28
,
072002
(
2017
).
38.
M.
Greben
,
P.
Khoroshyy
,
S.
Gutsch
,
D.
Hiller
,
M.
Zacharias
, and
J.
Valenta
, “Absorption cross-section changes with temperature and distance of Si nanocrystals,”
Beilstein J. Nanotechnol.
(to be published).
39.
U.
Banin
,
M.
Bruchez
,
A. P.
Alivisatos
,
T.
ha
,
S.
Weiss
, and
D. S.
Chemla
,
J. Chem. Phys.
110
,
1195
(
1999
).
40.
I.
Pelant
and
J.
Valenta
,
Luminescence Spectroscopy of Semiconductors
(
Oxford University Press
,
Oxford
,
2012
), pp.
58
63
.
41.
S. Q.
Gu
,
P. C.
Taylor
, and
J.
Ristein
,
J. Non-Cryst. Solids
137–138
,
591
(
1991
).
42.
D.
Hiller
,
S.
Goetze
,
F.
Munnik
,
M.
Jivanescu
,
J. M.
Gerlach
,
J.
Vogt
,
E.
Pippel
,
N.
Zakharov
,
A.
Stesmans
, and
M.
Zacharias
,
Phys. Rev. B
82
,
195401
(
2010
).
43.
44.
J.
Laube
,
S.
Gutsch
,
D.
Hiller
,
M.
Bruns
,
C.
Kübel
,
C.
Weiss
, and
M.
Zacharias
,
J. Appl. Phys.
116
,
223501
(
2014
).
45.
J.
Valenta
and
M.
Greben
,
AIP Adv.
5
,
047131
(
2015
).
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