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Hopping Conductivity in (Zn,Fe)Se Intentionally Doped with Ag

100%
Zaręba A., Demianiuk M.
Acta Physica Polonica A
|
1992
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vol. 82
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issue 5
749-752
EN
The transport phenomena in (Zn,Fe)Se were studied. In order to obtain iron centers in Fe^{3+} charge state the crystals were doped by Ag what produces acceptors compensating Fe^{2+} donors. The results are explained in terms of thermally activated jumping of charges between Fe^{3+} and Fe^{2+} centers. The nature of activation energy is discussed. The polaron model seems to be not valid in our case. The Coulomb interaction between charged acceptors and "holes" on iron centers is considered as the origin of thermal activation of jumps. We suggest the deviation from random and mutually independent distributions of charged Ag acceptors and Fe^{3+} ions resulting from the electrostatic interactions between them at high temperatures.
2
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High Quality ZnSe and Zn(Se,S) Produced by Low Temperature Physical Vapour Transport

81%
Mycielski A., Szadkowski A., Kowalczyk L., Zaręba A.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
1050-1054
EN
High quality, large (25 mm in diameter) crystals of ZnSe and Zn(Se,S) were grown by low-temperature physical vapour transport method and characterized by various techniques, i.e. energy dispersive X-ray fluorescence spectrometry, double-crystal X-ray diffraction rocking curve FWHM, reflectivity measurements in the region of free exciton, electrical measurements and photoluminescence measurements for both low and high excitation densities. The measurement of the photoluminescence related to the neutral-donor-bound exciton revealed superlinear log(photoluminescence intensity) versus log(excitation intensity) dependence, which indicates stimulated emission phenomena.
3
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Co^{2+} Centres in ZnTe Crystals Heavily Doped with Cobalt

81%
Zaręba A., Szadkowski A., Mycielski A., Witkowska B.
Acta Physica Polonica A
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1995
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vol. 87
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issue 2
453-456
EN
Co^{2+} centre in ZnTe has been proved to be an acceptor, contrary to the previous assignment, but in agreement with the general trend in the behaviour of the transition metal impurities in the II-VI compounds. The threshold of the Co^{2+} + hν → Co^{+1} + h transition has been found in the spectrum of photoconductivity at about 1.4 eV, close to the value already reported.
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