We present a study of the structural and optical properties of a heterostructure emitting in the midinfrared. The structure consists of monolayerlike InSb quantum wells inserted in an InAsGaSb superlattice (SL) matrix. X-ray diffraction and transmission electron microscopy analyses show a high structural quality of the structure. A strong emission line with a peak energy near 0.30eV(3.5μm) is observed from the monolayerlike InSb. In order to identify the physical origin of this transition, excitation density and temperature dependent photoluminescence experiments have been performed on samples with different nominal InSb thicknesses and SL designs. The experimental results suggest a type II band alignment, with electrons localized in the conduction miniband of the InAsGaSb SL matrix and holes localized in the monolayerlike InSb. This assignment is supported by the shift of InSb layer emission to lower energies when the SL design is changed, and by tight-binding calculations.

1.
See, e.g.,
Mid-infrared Semiconductor Optoelectronics
, edited by
A.
Krier
, (
Springer
,
Berlin-Heidelberg
,
2006
).
2.
N.
Bertru
,
R.
Klann
,
A.
Mazuelas
,
O.
Brandt
,
K. H.
Ploog
, and
S.
Gaillard
,
Appl. Phys. Lett.
69
,
2237
(
1996
).
3.
L. Q.
Qian
and
B. W.
Wessels
,
Appl. Phys. Lett.
63
,
628
(
1993
).
4.
S. J.
Smith
,
G. R.
Nash
,
M.
Fearn
,
L.
Buckle
,
M. T.
Emeny
, and
T.
Ashley
,
Appl. Phys. Lett.
88
,
081909
(
2006
).
5.
B. I.
Mirza
,
G. R.
Nash
,
S. J.
Smith
,
M. K.
Haigh
,
L.
Buckle
,
M. T.
Emeny
, and
T.
Ashley
,
Appl. Phys. Lett.
89
,
131110
(
2006
).
6.
J. B.
Rodriguez
,
P.
Christol
,
L.
Cerutti
,
F.
Chevrier
, and
A.
Joullié
,
J. Cryst. Growth
274
,
6
(
2005
).
7.
N.
Bertru
,
O.
Brandt
,
M.
Wassermeier
, and
K.
Ploog
,
Appl. Phys. Lett.
68
,
31
(
1996
).
8.
E.
Alphandéry
,
R. J.
Nicholas
,
N. J.
Mason
,
B.
Zhang
,
P.
Möck
, and
G. R.
Booker
,
Appl. Phys. Lett.
74
,
2041
(
1999
).
9.
B. C.
De Cooman
and
C. B.
Carter
,
Thin Solid Films
170
,
49
(
1989
).
10.
H. J.
Haugan
,
G. J.
Brown
,
F.
Szmulowicz
,
L.
Grazulis
,
W. C.
Mitchel
,
S.
Elhamri
, and
W. D.
Mitchel
,
J. Cryst. Growth
278
,
198
(
2005
).
11.
N.
Bertru
,
A. N.
Baranov
,
Y.
Cuminal
,
G.
Boissier
,
C.
Alibert
, and
A.
Joullie
,
J. Appl. Phys.
85
,
1989
(
1999
).
12.
N. N.
Ledentsov
,
J.
Böhrer
,
M.
Berr
,
F.
Heinrichsdorff
,
M.
Grundmann
,
D.
Bimberg
,
S. V.
Ivanov
,
B. Ya.
Melster
,
S. V.
Shaposhnikov
,
I. N.
Yassievich
,
N. N.
Faleev
,
P. S.
Kop’ev
, and
Zh. I.
Alferov
,
Phys. Rev. B
52
,
14058
(
1995
).
13.
H. J.
Haugan
,
F.
Szmulowicz
,
G. J.
Brown
,
B.
Ullrich
,
S. R.
Munshi
,
J. C.
Wickett
, and
D. W.
Stokes
,
Phys. Status Solidi C
4
,
1702
(
2007
).
14.
J. M.
Jancu
,
R.
Scholz
,
F.
Beltram
, and
F.
Bassani
,
Phys. Rev. B
57
,
6493
(
1997
).
15.
C. E.
Pryor
and
M. E.
Pistol
,
Phys. Rev. B
72
,
205311
(
2005
).
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