Vibrational spectra of admixed atoms in zinc and cadmium chalcogenides

Vodop’yanov, L. K.; Vinogradov, Evgenii; Vinogradov, V. S.; Tsurkan, A. E.; Verlan, V. I.

doi:10.1007/bf00606489

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The vibration frequencies of impurity atoms (in the mass defect approximation) are rather well described by V. S. Vinogradov's theory 23 at concentration x < 0.3 and (1− x ) < 0.3 10–17 if the optical phonon density‐of‐state function and the atomic vibration amplitudes of the impurity‐free crystal are known. As shown in Ref.…”

Section: Discussionmentioning

confidence: 95%

“…In the solid solutions of the polar compounds of the ${\rm A}_{1 - x} {\rm B}_x {\rm C}$ type where atoms A and B belong to the same group of the periodic table, unlike in the extreme compounds AC and BC, an elementary cell contains not only the base dipoles ${\rm A} - {\rm C}$ and ${\rm B} - {\rm C}$ but also the ${\rm A} - {\rm B}$ dipole, which is an order of magnitude weaker than the base ones 10–19. These additional (with respect to the ideal pseudo binary solid solution) optical phonons at the center of the Brillouin zone have inverted order of frequencies of the longitudinal $\omega _{{\rm LO}}^{{\rm add}}$ and transverse optical $\omega _{{\rm TO}}^{{\rm add}}$ phonons: $\omega _{{\rm LO}}^{{\rm add}} < \omega _{{\rm TO}}^{{\rm add}}$ .…”

Section: Introductionmentioning

confidence: 99%

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Inverted optical phonons in II–VI semiconducting compounds

Vinogradov

Новикова

Yakovlev

2010

Physica Status Solidi (b)

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Additional optical phonons discovered in the majority of binary solid solution crystals of II-VI semiconductor compounds are discussed. Frequencies of these additional phonons are located inside the transverse-longitudinal splitting of the G point optical phonons, where the real part of the crystal permittivity is negative, and are split by the crystal field into transverse optical (TO) and longitudinal optical (LO) phonons, the frequencies of these additional LO phonons turning out to be lower than those of additional TO phonons.1 Introduction Solid solution systems like Zn 1Àx Cd x S, Zn 1Àx Cd x Se, Zn 1Àx Cd x Te, ZnSe x S 1Àx hold much promise for practical applications, in particular in optoelectronics, due to their unusual physical properties. Structures with quantum wells [1] and quantum dots [2] based on thin layers of these materials, which are candidates for light sources in the blue spectral region, were formed and investigated. Chromiumdoped crystals of these materials have proven to show promise for making femtosecond lasers in the near-infrared (IR) region (l % 2:5 Ä 3:5 mm) [3,4].The compositional disorder of a solid solution modifies the structural, vibrational, and optical properties of polar crystals. These changes give rise to special features in the lattice dynamics of ternary solid solutions of the substitution type (single-mode, two-mode, or intermediate behavior of the transverse v TO and longitudinal v LO vibration frequencies of the system [5]) as well as to the emergence of new modes [local, gap, or resonance (quasi resonance) excitations] and to the defect-induced density of phonon states [6].For a diatomic crystal of the ZnS type, the difference in phonon frequencies v TO and v LO are given by [7]:

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Inverted optical phonons in II–VI semiconducting compounds

Vinogradov

Новикова

Yakovlev

2010

Physica Status Solidi (b)

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“…The measurements of crystal reflectivity were made on a specially designed set-up. The experimental technique allowed to analyze the samples of dimensions 3 x 5 mm2 and with a resolution not worse than 0.3 cm-' [8]. The Raman spectra were studied with the help of a He-Ne 45 mW emission power laser (A = 632.8 nm) by the traditional method.…”

Section: Methodsmentioning

confidence: 99%

Impurity Centres in ZnTe Crystals Doped with Be, Mg, Cd, and Hg

Tsurkan¹,

Rebrov²,

Medvetskii³

et al. 1991

Physica Status Solidi (b)

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The reflection coefficient, Raman scattering, and photoluminescence spectra are investigated in ZnTe crystals, doped by isoelectronic impurities (Be, Mg, Cd, and Hg) up to concentration w 10' ' ~m -~. It is shown that the above-mentioned impurities essentially influence the optical and emission properties of ZnTe crystals. It is possible only in that case when the introduced impurity forms a bound exciton complex with the local centre. The bound exciton energies of doped ZnTe crystals are determined.An ZnTe-Kristallen, die mit isoelektronischen Storstellen (Be, Mg, Cd und Hg) bis zu Konzentrationen w 10' ' cm-3 dotiert sind, werden Reflexionskoefizient, Raman-Streuung und Photolumineszenzspektren untersucht. Es wird gezeigt, daR die oben erwiihnten Storstellen die optischen und Emissionseigenschaften von ZnTe-Kristallen wesentlich beeinflussen. Dies ist nur in dem Fall moglich, wenn die eingefiihrten Storstellen gebundene Exzitonenkomplexe mit den lokalen Zentren bilden. Die Energien der gebundenen Exzitonen der dotierten ZnTe-Kristalle werden bestimmt.') Ya. S. Grosul str. 5, SU-277028 Kishinev, USSR. 26 physica (h) 163/2

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Cadmium selenide (CdSe) local mode wavenumbers

Landolt-Börnstein - Group III Condensed Matter

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Vibrational spectra of admixed atoms in zinc and cadmium chalcogenides

Cited by 3 publications

References 7 publications

Inverted optical phonons in II–VI semiconducting compounds

Inverted optical phonons in II–VI semiconducting compounds

Impurity Centres in ZnTe Crystals Doped with Be, Mg, Cd, and Hg

Cadmium selenide (CdSe) local mode wavenumbers

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