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Peterson, D. L.; Petrou, A.; Giriat, W.; Ramdas, A. K.; Rodríguez, S.

doi:10.1103/physrevb.33.1160

Cited by 120 publications

(53 citation statements)

References 9 publications

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“…Similar experiments performed on Zn 1−x Mn x Te NWs also revealed spectra with shifts and splittings of Raman lines comparable to those observed in bulk Zn 1−x Mn x Te mixed crystal [32] with a composition equal to the composition of NWs estimated based on their lattice constant. In the case of Zn 1−x Mn x Te NWs, additional support for the substitutional incorporation of Mn into the zinc site of the lattice comes from the observation of the strong photoluminescence line centered at an energy around 2 eV.…”

Section: 5supporting

confidence: 48%

MBE Growth and Properties of ZnTe- and CdTe-Based Nanowires

Wójtowicz¹,

Janik²,

Zaleszczyk³

et al. 2008

J. Korean Phy. Soc.

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We review our results on the growth of ZnTe-and CdTe-based nanowires (NWs) and on their basic structural and optical properties. The nanowires were produced by using molecular beam epitaxy (MBE) with the use of a mechanism of catalytically-enhanced growth. The growth of ZnTe, CdTe, ZnMgTe and ZnMnTe nanowires was performed from elemental Zn, Cd, Mn, Mg and Te sources on the surfaces of (001)-, (110)-and (111)B-oriented GaAs substrates with Au nanocatalysts. The morphological and structural properties of the nanowires were assessed by using X-ray diffractometry, field-emission scanning electron microscopy, and high resolution transmission electron microscopy. Additional studies of the compositions of both the nanowires and the Au-rich nanocatalysts were performed with the use of energy dispersive X-ray spectroscopy. The optical properties of the NWs were assessed by using photoluminescence and Raman-scattering studies performed in both macro and micro modes. The studies revealed that binary and quaternary nanowires with average diameters from 30 to 70 nm and lengths from 1 to 2.6 µm were monocrystalline in their upper parts, their growth axis was 111 , and they grow along the [111] direction of the substrate, independent of the substrate orientation used. A Au-rich (with 20 % Ga) spherical nanocatalyst was always visible at the tip of a nanowire, thus indicating that a vapor-liquid-solid mechanism was responsible for the growth of the ZnTe-and the CdTe-based nanowires. The formation of homogeneous mixed crystal ZnMnTe and ZnMgTe nanowires was demonstrated by measurements of the variation of the lattice constant and by Raman experiments that revealed the expected shift and appearance of new phonon lines and a strong enhancement of the LO-phonon structures for an excitation close to the exciton energy of the NW materials. The photoluminescence from the internal Mn 2+ transition between crystal-field-split energy levels ( 4 T1 → 6 A1) was observed in the ZnMnTe nanowires.

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Section: 5supporting

confidence: 48%

MBE Growth and Properties of ZnTe- and CdTe-Based Nanowires

Wójtowicz¹,

Janik²,

Zaleszczyk³

et al. 2008

J. Korean Phy. Soc.

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“…These values are similar to analogous parameters obtained for some wide-gap Il-VI compounds, e.g. (Zn,Mn)Se, (Cd,Mn)Se [12], (Zn,Mn)Te and (Cd,Mn)Te [2]. As the fraction of Mg increases, experimental data of the Raman shift for MgSe-like and ZnSe-like modes deviate from the calculated ones.…”

supporting

confidence: 63%

“…element, which has an atomic mass significantly smaller than this of constituent atoms of a host 1attice, can be described by two-mode model [1,2]. This lighter component exhibits a vibrational mode (local mode) with a frequency higher than that of the perfect crystal.…”

mentioning

confidence: 99%

Raman Scattering in Zn_1-xMg_xSe Mixed Crystals

et al. 1996

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This paper presents results of investigations of the Raman scattering of vibrational modes in Ζn1-xMgxSe crystals for the range of composition 0 < x < 0.43. The Raman polarized spectra of Zn1-x Mgx 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 isodisylacement model. Results of the Raman measurements in the investigated range of composition confirm the two-mode behaviour of the optical phonons in the mixed Zn1-x MgxSe crystals.PACS numbers: 78.30. Fs, 78.55.Et, The physical properties of wide gap II-VI ternary and quaternary mixed crystals have been recently extensively studied. The current interest in these materials arises from scientiflc and application points of view. As far as an application is concerned, ternary and quateuary II-VI alloys are especially interesting in the context of possibility of an additional control of band gap energies, lattice constants as well as conduction and valence bands offsets in heterostructures. These parameters are very important for effective carriers injection and radiative recombination processes in electroluminescent devices based on multilayer heterostructures.For the study of vibrational properties of mixed crystals the Raman scattering is widely used as the experimental method. The vibrational spectra of tetrahedrally coordinated semiconduction where a fraction of cations is replaced by an

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“…5 19,25 Although the resonance Raman scattering has allowed the observation of the many phonon features even at very low iron concentrations ͑x ϳ 0.01͒ in Zn 1−x Fe x Te, one needs much higher x to explore the concentration dependence of the phonon frequencies to fully establish the intermediate mode behavior.…”

Section: Resultsmentioning

confidence: 99%