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Photoluminescence and Photoacoustic Investigations of Beryllium and Magnesium Containing Wide Gap II-VI Mixed Crystals

100%
Firszt F., Łęgowski S., Męczyńska H., Sekulska B., Szatkowski J., Zakrzewski J., Paszkowicz W.
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vol. 95
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issue 6
991-996
EN
Zn_{1-x}Be_{x}Se, Cd_{1-x}Mg_{x}Se and Zn_{1-x-y}Be_{x}Mg_{y}Se mixed crystals grown from the melt with different concentrations of Be and Mg have been characterized by photoluminescence and photoacoustic methods. An increase in band gap energy with increasing Be and Mg contents was observed. The photoacoustic spectroscopy was also employed for evaluation of thermal diffusivity of mixed Zn_{1-x}Be_{x}Se crystals with different beryllium contents.
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Photoacoustic Investigation of Absorption Edge of Cd_{1-x}Mg_{x}Se Mixed Crystals

100%
Firszt F., Łęgowski S., Męczyńska H., Sekulska B., Szatkowski J., Zakrzewski J., Paszkowicz W.
Acta Physica Polonica A
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1997
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vol. 92
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issue 4
749-752
EN
The Cd_{1-x}Mg_{x}Se crystals were grown by modified Bridgman method for x ranging from 0 to 0.44. The photoacoustic spectroscopy was employed for evaluation of the band gaps of series Cd_{1-x}Mg_{x}Se mixed crystals with different composition. The photoacoustic spectra were measured at 300 K and 90 K using continuous wave excitation in the range from 400 nm to 800 nm. The increase in the band-gap energy with increasing Mg content is observed. The photoacoustic results are compared with photoluminescence and transmission spectra.
3
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Raman Scattering in Zn_{1-x}Mg_{x}Se Mixed Crystals

84%
Kozielski M., Szybowicz M., Firszt F., Łęgowski S., Męczyńska H., Sekulska B., Szatkowski J., Paszkowicz W.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
1040-1044
EN
This paper presents results of investigations of the Raman scattering of vibrational modes in Zn_{1-x}Mg_{x}Se crystals for the range of composition 0 < x < 0.43. The Raman polarized spectra of Zn_{1-x}Mg_{x}Se were measured at room temperature. The typical Raman spectrum shows four peaks which can be interpreted as longitudinal and transverse optical ZnSe-like and MgSe-like phonons. The ZnSe-like and MgSe-like vibrations can be described by the modified random element isodisplacement model. Results of the Raman measurements in the investigated range of composition confirm the two-mode behaviour of the optical phonons in the mixed Zn_{1-x}Mg_{x} Se crystals.
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