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Study of Zn1-xMgxSe and Zn1-xBexSe semiconducting crystals by Raman scattering

100%

Szybowicz M. , Kozielski M. , Firszt F. , Łęgowski S. , Męczyńska H. , Szatkowski J. , Paszkowicz W.

1999

tom Vol. 7, No. 2

103-106

Wide gap II-VI mixed crystals containing Mg and Be are recently studied extensively for their application in constructing blue-green laser diodes. This work deals with experimental study of optical modes in Zn1-xMgxSe and Zn1-xBexSe semiconductors using Raman scattering method. Measurements have been performed at room and liquid nitrogen temperatures for Zn1-xMgxSe crystals with Mg content in the range 0 < x < 0,34 and for Zn1-xBexSe with Be content in the range 0 < x 0,26. From polarised Raman spectra the longitudinal (LO) and the transverse (TO) optical mode, corresponding to ZnSe- and MgSe - like modes in Zn1-x MgxSe and to ZnSe- and BeSe - like modes in Zn1-xBexSe, were determined. These lattice vibrations can be described by the modified random element isodisplacement (MREI) model.

Photoluminescence and structural properties of selected wide-gap II-VI solid solutions.

100%

Firszt F. , Łęgowski S. , Męczyńska H. , Sekulska B. , Szatkowski J. , Paszkowicz W. , Marczak M.

1999

tom Vol. 7, No. 2

87-92

This work presents results of investigations of photoluminescence and structural properties of ternary Zn₁-xBexSe, Cd₁-xMgxSe, Zn₁-xMgxSe and quaternary Cd₁-x-yMgxZnySe, Zn₁-x-yBexMgySe, Zn₁-xMgxSe₁-ySy mixed crystals. These crystals were grown from the melt by the high-pressure Bridgman method. Zn₁-xMgxSe and Zn₁-xSrxSe were also obtained by annealing of ZnSe crystals in evacuated quartz ampoules containing Mg or Sr metal. It has been found that admixing of Mg into ZnSe favours the formation of wurtzite Zn₁-xMgxSe while Besphalerite Zn₁-xBexSe structures. Low temperature (40 K) photoluminescence spectra consist of exciton, edge and deep levels emission bands. For most of investigated crystals the emission corresponding to the highest photon energy line in luminescence spectrum is observed up to room temperature.

Structure of bulk ZnSe based solid solutions containing Mg and Be

84%

Paszkowicz W. , Dłużewski P. , Spolnik Z. , Godwod K. , Domagała J. , Firszt F. , Sekulska B. , Szatkowski J.

tom Vol. 31, No. 2

208-212

Structural properties, defects and exciton transition energy of bulk Zn₁-xMgxSe, 0 ≤ x ≤ 0.63, and Zn₁-xBexSe, 0 ≤ x ≤ 0.18, crystals are briefly reported. Zn₁-xMgxSe crystallises in the sphalerite strucrure type for low x and in the wurtzite one for hight x, while at x about 0.18, 4H and 8H polytypes may be formed. Zn₁-xBexSe crystallises in the sphalerite type in the studied composition range. An increase of microhardness in Zn0.82Be0.18 by the factor 2.37 in relation to ZnSe is observed.