Among colloidal nanocrystals, 2D nanoplatelets (NPLs) made of cadmium chalcogenides have led to especially well controlled optical features. However, the growth of core shell heterostructures has so far been mostly focused on CdS shells, while more confined materials will be more promising to decouple the emitting quantum states of the core from their external environment. Using k·p simulation, we demonstrate that a ZnS shell reduces by a factor 10 the leakage of the wavefunction into the surrounding medium. Using X-ray photoemission (XPS), we confirm that the CdSe active layer is indeed unoxidized. Finally, we build an effective electronic spectrum for these CdSe/ZnS NPLs on an absolute energy scale which is a critical set of parameters for the future integration of this material into optoelectronic devices. We determine the work function (WF) to be 4.47 eV while the material is behaving as an n-type semiconductor.
References
1.
E.
Lhuillier
, M.
Scarafagio
, P.
Hease
, B.
Nadal
, H.
Aubin
, X. Z.
Xu
, N.
Lequeux
, G.
Patriarche
, S.
Ithurria
, and B.
Dubertret
, Nano Lett.
16
, 1282
(2016
).2.
J.
Joo
, J. S.
Son
, S. G.
Kwon
, J. H.
Yu
, and T.
Hyeon
, J. Am. Chem. Soc.
128
, 5632
(2006
).3.
E.
Lhuillier
, S.
Pedetti
, S.
Ithurria
, B.
Nadal
, H.
Heuclin
, and B.
Dubertret
, Acc. Chem. Res.
48
, 22
(2015
).4.
M.
Nasilowski
, B.
Mahler
, E.
Lhuillier
, S.
Ithurria
, and B.
Dubertret
, Chem. Rev.
116
, 10934
(2016
).5.
L. C.
Flatten
, S.
Christodoulou
, R. K.
Patel
, A.
Buccheri
, D. M.
Coles
, B. P. L.
Reid
, R. A.
Taylor
, I.
Moreels
, and J. M.
Smith
, Nano Lett.
16
, 7137
(2016
).6.
A.
Riedinger
, F. D.
Ott
, A.
Mule
, S.
Mazzotti
, P. N.
Knüsel
, S. J. P.
Kress
, F.
Prins
, S. C.
Erwin
, and D. J.
Norris
, “An intrinsic growth instability in isotropic materials leads to quasi-two-dimensional nanoplatelets,” Nat. Mater.
(published online
).7.
F.
Fan
, P.
Kanjanaboos
, M.
Saravanapavanantham
, E.
Beauregard
, G.
Ingram
, E.
Yassitepe
, M. M.
Adachi
, O.
Voznyy
, A. K.
Johnston
, G.
Walters
, G.-H.
Kim
, Z.-H.
Lu
, and E. H.
Sargent
, Nano Lett.
15
, 4611
(2015
).8.
Z.
Chen
, B.
Nadal
, B.
Mahler
, H.
Aubin
, and B.
Dubertret
, Adv. Funct. Mater.
24
, 295
(2014
).9.
A. W.
Achtstein
, A.
Schliwa
, A.
Prudnikau
, M.
Hardzei
, M. V.
Artemyev
, C.
Thomsen
, and U.
Woggon
, Nano Lett.
12
, 3151
(2012
).10.
R.
Benchamekh
, N. A.
Gippius
, J.
Even
, M. O.
Nestoklon
, J.-M.
Jancu
, S.
Ithurria
, B.
Dubertret
, A. L.
Efros
, and P.
Voisin
, Phys. Rev. B
89
, 35307
(2014
).11.
J. Q.
Grim
, S.
Christodoulou
, F.
Di Stasio
, R.
Krahne
, R.
Cingolani
, L.
Manna
, and I.
Moreels
, Nat. Nanotechnol.
9
, 891
(2014
).12.
B.
Guzelturk
, Y.
Kelestemur
, M.
Olutas
, S.
Delikanli
, and H. V.
Demir
, ACS Nano
8
, 6599
(2014
).13.
C.
She
, I.
Fedin
, D. S.
Dolzhnikov
, A.
Demortière
, R. D.
Schaller
, M.
Pelton
, and D. V.
Talapin
, Nano Lett.
14
, 2772
(2014
).14.
S.
Ithurria
and D. V.
Talapin
, J. Am. Chem. Soc.
134
, 18585
(2012
).15.
B.
Mahler
, B.
Nadal
, C.
Bouet
, G.
Patriarche
, and B.
Dubertret
, J. Am. Chem. Soc.
134
, 18591
(2012
).16.
A.
Prudnikau
, A.
Chuvilin
, and M.
Artemyev
, J. Am. Chem. Soc.
135
, 14476
(2013
).17.
S.
Pedetti
, S.
Ithurria
, H.
Heuclin
, G.
Patriarche
, and B.
Dubertret
, J. Am. Chem. Soc.
136
, 16430
(2014
).18.
B.
Mahler
, P.
Spinicelli
, S.
Buil
, X.
Quelin
, J.-P.
Hermier
, and B.
Dubertret
, Nat. Mater.
7
, 659
(2008
).19.
P.
Harrison
, Quantum Wells, Wires and Dots
, 2nd ed. (Wiley
, Hoboken, NJ
, 2005
).20.
O.
Madelung
, M.
Schulz
, and H.
Weiss
, Numerical Data and Functional Relationships in Science and Technology
, New Series. Group III: Crystal and Solid State Physics. Semiconductors, Supply and Extension, Vol. III/17. Intrinsic Properties of Group IV Elements and III–V, II–VI, and I–VII Compounds (Springer
, Berlin
, 1982
).21.
S. Z.
Karazhanov
and L. C. L. Y.
Voon
, Semiconductors
39
, 161
(2005
).22.
R.
Dalven
, Phys. Status Solidi B
48
, K23
(1971
).23.
L.
Quiroga
, F. J.
Rodríguez
, A.
Camacho
, and C.
Tejedor
, Phys. Rev. B
42
, 11198
(1990
).24.
S.-H.
Wei
and A.
Zunger
, Appl. Phys. Lett.
72
, 2011
(1998
).25.
F.
Polack
, M.
Silly
, C.
Chauvet
, B.
Lagarde
, N.
Bergeard
, M.
Izquierdo
, O.
Chubar
, D.
Krizmancic
, M.
Ribbens
, J.-P.
Duval
, C.
Basset
, S.
Kubsky
, and F.
Sirotti
, AIP Conf. Proc.
1234
, 185
(2010
).26.
D. D.
Sarma
, P. K.
Santra
, S.
Mukherjee
, and A.
Nag
, Chem. Mater.
25
, 1222
(2013
).27.
B.
Mahler
, L.
Guillemot
, L.
Bossard-Giannesini
, S.
Ithurria
, D.
Pierucci
, A.
Ouerghi
, G.
Patriarche
, R.
Benbalagh
, E.
Lacaze
, F.
Rochet
, and E.
Lhuillier
, J. Phys. Chem. C
120
, 12351
(2016
).28.
J. E. B.
Katari
, V. L.
Colvin
, and A. P.
Alivisatos
, J. Phys. Chem.
98
, 4109
(1994
).29.
E.
Lhuillier
, S.
Ithurria
, A.
Descamps-Mandine
, T.
Douillard
, R.
Castaing
, X. Z.
Xu
, P.-L.
Taberna
, P.
Simon
, H.
Aubin
, and B.
Dubertret
, J. Phys. Chem. C
119
, 21795
(2015
).30.
C.
Wang
, M.
Shim
, and P.
Guyot-Sionnest
, Science
291
, 2390
(2001
).31.
H.-L.
Yip
and A. K.-Y.
Jen
, Energy Environ. Sci.
5
, 5994
(2012
).© 2017 Author(s).
2017
Author(s)
You do not currently have access to this content.
