A. Holda et al., THE IRON STATES IN CD1-XFEXTE IN THE FUNDAMENTAL GAP ENERGY-RANGE, Physica status solidi. b, Basic research, 189(2), 1995, pp. 543-558
The reflectivity, absorption, photoconductivity, and cathodoluminescen
ce spectra for Cd1-xFexTe (0 less than or equal to x less than or equa
l to 0.05) at 300 and 77 K are investigated. The measurements are carr
ied out in the fundamental gap energy range. From the analysis of the
experimental results, the energy positions and properties of Fe states
in the CdTe matrix in the fundamental gap region are presented and di
scussed. It is concluded that the increase of the width of the fundame
ntal,gap with the change of temperature from 300 to 77 K leads mainly
to the rise of the energy distance between the donor-like iron state (
5)E and the bottom of the conduction band, whereas the energy distance
between the iron state (5)E and the top of the valence band remains u
nchanged. The increase of the fundamental gap value with the decrease
of temperature changes the energy positions of the excitation iron sta
te T-3(1) With respect to the bottom of the conduction band. Energy po
sitions of iron stales in the fundamental gap energy region as well as
the increase of the energy width and density of these states with the
rise of the iron concentration in Cd1-xFexTe are reflected in the res
ults obtained with the use of different experimental methods.