Band‐to‐band infrared absorption has been studied in a series of Sn1Gem (m=11, 15, and 21) strained layer superlattices for the first time. The absorption coefficient shows a quadratic increase with two onsets, characteristic for indirect transitions. From a numerical fit to the absorption spectra, band gap energies are determined in the energy range between 0.55 and 0.75 eV, in accordance with theoretical calculations. The temperature dependence of the band gaps show the usual behavior, at low temperatures quadratic and at higher temperatures linear decrease with increasing temperature.

1.
W.
Wegscheider
,
K.
Eberl
,
U.
Menczigar
, and
G.
Abstreiter
,
Appl. Phys. Lett.
57
,
875
(
1990
).
2.
W. Wegscheider, K. Eberl, U. Menczigar, J. Olajos, G. Abstreiter, and P. Vogl, Proceedings of the 20th International Conference on Physics of Semiconductors, edited by E. M. Anastassakis and J. D. Joannopoulos (World Scientific, Singapore, 1990), p. 1685.
3.
J.
Olajos
,
P.
Vogl
,
W.
Wegscheider
, and
G.
Abstreiter
,
Phys. Rev. Lett.
67
,
3164
(
1991
).
4.
D. W.
Jenkins
and
J. D.
Dow
,
Phys. Rev. B
36
,
7994
(
1987
).
5.
K. A.
Mäder
,
A.
Baldereschi
, and
H.
von Kanel
,
Solid State Commun.
69
,
1123
(
1989
).
6.
C. H. L.
Goodman
,
IEEE Proc.
129
,
189
(
1982
).
7.
G. A. Busch and R. Kern, in Solid State Physics, edited by H. Ehrenreich, F. Seitz, and D. Turnbull (Academic, New York, 1961), Vol. 11, p. 1.
8.
R. F.
Farrow
,
D. S.
Robertson
,
G. M.
Williams
,
A. G.
Cullis
,
G. R.
Jones
,
I. M.
Young
, and
P. N. J.
Dennis
,
J. Cryst. Growth
54
,
507
(
1981
).
9.
J. L.
Reno
and
A. L.
Stephenson
,
Appl. Phys. Lett.
54
,
2207
(
1989
).
10.
M. T.
Asom
,
A. R.
Kortan
,
L. C.
Kimmerling
, and
R. C.
Farrow
,
Appl. Phys. Lett.
55
,
1439
(
1989
).
11.
H.
Höchst
,
M. A.
Engelhardt
, and
J.
Hernandéz-Calderon
,
Phys. Rev. B
40
,
9703
(
1989
).
12.
P.
Vogl
,
J.
Olajos
,
W.
Wegscheider
, and
G.
Abstreiter
,
Surf. Sci.
267
,
83
(
1992
).
13.
G. F. Bassani and G. P. Parravicini, Electronic States and Optical Transitions in Solids (Pergamon, Oxford, 1975).
This content is only available via PDF.
You do not currently have access to this content.