Optical Investigations of Lattice Vibrations of II-VI Compound Semiconductors

Ram, Rishi; Kushwaha, S. S.; Rajput, J. S.

doi:10.1143/jpsj.58.4032

Cited by 8 publications

(1 citation statement)

References 53 publications

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“…The to ZnTe NPs as reported in earlier works [23,24]. The vibration mode frequencies at 566, 614, 631 and 694 cm -1 are in agreement with that previously established by many autors for the C-Cl bond in the PVC polymer with non-crystalline phase [25].…”

Section: Raman Spectroscopysupporting

confidence: 89%

Structural, Electrical and Optical Properties of PVC/ZnTe Nanocomposite Thin Films

El-Hachemi

Sebais

Sabah

et al. 2021

J Inorg Organomet Polym

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ZnTe nanoparticles (NPs) were synthesized using hydrothermal method and then were dispersed in poly(vinyl-chloride) (PVC) to prepare hybrid PVC/ZnTe nanocomposite thin films which were deposited on glass substrates by the dip coating technique. Structural, optical and electrical properties of films were investigated by different techniques. XRD analysis revealed that synthesized ZnTe NPs have a cubic structure and a nanoscale size,while pure PVC films have a weak degree of crystallinity and exhibit a broad diffraction peak at low angles. The PVC/ZnTe nanocomposite thin films display an intense diffraction peak corresponding to the plane ( 220) which indicates a preferred orientation of ZnTe nanocystallites along crystallographic axis [220]. This texture was also showed by the atomic force microscopy micrographs.The analysis by FT-IR and Raman vibrational spectroscopies confirmed the incorporation of ZnTe NPs in the PVC matrix.The ZnTe/PVC nanocomposites thin films have an optical transparency over 80 % in the visible range and an optical gap close to 4.07 eV. Discrepancies with respect to the gap of pure PVC (red shift) and bulk ZnTe (blue shift) are due to the effect of the interaction between the ZnTe NPsand the PVC matrixand alsoto the nanometric size of the ZnTe crystallites. Photoluminescence (PL) spectra showed an enhanced blue emission at 466 nm,a green emissionat 522 nm and a strong red emission at 686 nm. Thus the incorporation of oriented ZnTe NPs induced a new optical behavior of the PVC polymer matrix.Electrical measurements indicate a decrease of electrical resistivity of PVC/ZnTe nanocompositesas ZnTe NPs concentration increases.

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Section: Raman Spectroscopysupporting

confidence: 89%

Structural, Electrical and Optical Properties of PVC/ZnTe Nanocomposite Thin Films

El-Hachemi

Sebais

Sabah

et al. 2021

J Inorg Organomet Polym

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Raman spectroscopy of oxygenated amorphous CdTe films

Morell

Reynés‐Figueroa

Katiyar

et al. 1994

J Raman Spectroscopy

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Oxygenated CdTe films prepared by r.f. sputtering have been shown to have band gap energies between 1.48 and 3.35 eV, depending on the amount of oxygen incorporated in the CdTe matrix. Samples with oxygen concentrations above 7 at.% are amorphous, whereas those with oxygen concentrations below 7 at.% are polycrystalline, as determined by x-ray and Raman measurements. The Raman spectra of the polycrystalline samples show that there is ca. 4 at.% Te in the form of inclusions under high pressure, which is relatively easy to detect owing to the enhanced Raman cross-section of Te. The Raman spectra of the amorphous samples is dominated by a single broad band at 159 cm-'. The fact that tellurates in general show a similar band, in spite of their different vibrational density of states, indicates that it corresponds to Te-Te bonds in the amorphous matrix.

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Zinc telluride (ZnTe) phonon dispersion, phonon frequencies and related data

Landolt-Börnstein - Group III Condensed Matter

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Optical Investigations of Lattice Vibrations of II-VI Compound Semiconductors

Cited by 8 publications

References 53 publications

Structural, Electrical and Optical Properties of PVC/ZnTe Nanocomposite Thin Films

Structural, Electrical and Optical Properties of PVC/ZnTe Nanocomposite Thin Films

Raman spectroscopy of oxygenated amorphous CdTe films

Zinc telluride (ZnTe) phonon dispersion, phonon frequencies and related data

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