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2 Materials Science Poland

2 2008

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Raman spectroscopy of Zn1-xCoxO bulk mixed crystals

100%

Szuszkiewicz W. , Morhange J. F. , Schumm M. , Lentze M. , Gołacki Z. , Skupiński P. , Grasza K. , Geurts J.

tom Vol. 26, No. 4

1045--1052

We report on a study of structural properties of Zn1-xCoxO by micro- and macro-Raman scattering from phonons. Bulk mixed crystals (x ≤ 0,03), grown by chemical vapour transport were investigated between 5 K and 295 K. Beside the common eigenmodes of the ZnO host lattice, we observed disorder-induced lattice vibration modes and a structure, tentatively assigned to a local vibration mode of the Co impurity. Our results are compared with literature data of other ZnO-based diluted magnetic semiconductors such as (Zn,Mn)O.

Raman scattering studies of MBE-grown ZnTe nanowires

100%

Szuszkiewicz W. , Morhange J. F. , Dynowska E. , Janik E. , Zaleszczyk W. , Presz A. , Domagała J. Z. , Caliebe W. , Karczewski G. , Wojtowicz T.

tom Vol. 26, No. 4

1054--1059

We report on the first studies of the optical properties of MBE-grown ZnTe nanowires (NWs). The growth of ZnTe NWs was based on the Au-catalyzed vapour–liquid–solid mechanism and was performed on (001), (011), or (111)B-oriented GaAs substrates. Investigated NWs have a zinc-blende structure, the average diameter of about 30 nm, and typical length between 1 and 2 μm. Their growth axes are oriented along <111>-type directions of the substrate. The structural characterization of the NWs was performed by means of X-ray diffraction, using the synchrotron radiation corresponding to the wavelength of CuKα1 radiation W1 beamline at Hasylab DESY). The macro-Raman spectra of either as-grown NWs on GaAs substrate or of NWs removed from substrate and deposited onto Si were collected at temperatures from 15 K to 295 K using Ar+ and Kr+ laser lines. Strong enhancement of ZnTe-related LO-phonon structure was found for an excitation close to the exciton energy. Our studies revealed also the presence of small trigonal Te precipitates, typical of tellurium compounds.