Lattice dynamics of ZnSe x S1 − x semiconductor crystals

Vinogradov, Evgenii; Новикова, Н. Н.; Yakovlev, V.A.; Popova, Daria

doi:10.1134/s1054660x09020030

Cited by 12 publications

(21 citation statements)

References 24 publications

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“…The corresponding modes, theoretically forbidden, occur at (230-250 cm À1 , 260-280 cm À1 , 315-350 cm À1 ). Note the activation of the parasitical X mode at $300 cm À1 at large S content, as expected from the IR data [19,20].…”

Section: Zn-s and To Sesupporting

confidence: 52%

“…In fact, Vinogradov et al detected a rather intricate multi-mode pattern in the Zn-S spectral range of ZnSe x S 1Àx [19,20], including as much as three distinct oscillators. Out of these, a minor oscillator at $300 cm À1 in all investigated samples, labeled X hereafter, already shows up in the IR spectrum of pure ZnS (see Fig.…”

Section: Situation Around Zn(ses) and Its Previous Studiesmentioning

confidence: 97%

“…However, an exhaustive IR study by Vinogradov et al. [19,20], supported by ab initio phonon calculations near C, has recently revealed, besides the apparently unique mode due to the long Zn-Se bond at $210 cm À1 , a distinct doublet in the spectral range of the short Zn-S species. The doublet emerges within the frequency domain 280-320 cm À1 , and remains visible at any alloy composition, as shown in Fig.…”

Section: Situation Around Zn(ses) and Its Previous Studiesmentioning

confidence: 97%

“…In this section, we examine whether the Zn-S doublet of ZnSe x S 1Àx earlier detected in the q 1 -regime by Vinogradov et al in their IR spectra [19,20] and shown in Fig. 1c, can be explained within the 1-bond ?…”

Section: The Percolation Model -The Current Picturementioning

confidence: 98%

“…Based on ab initio calculations (using the ABINIT code) of species-resolved C-projected TO density of states (BZC-TO-DOS) done with 16-atom quasirandom Zn 4 S 3 Se supercells, Vinogradov et al assigned the overall ZnSe x S 1Àx vibration spectra in terms of a three-mode [1 Â (Zn-Se), 1 Â (Zn-S), 1 Â (Zn-S,Zn-Se)] pattern characterized by two genuine Zn-Se and Zn-S modes plus a minor (Zn-S,Zn-Se)-mixed mode at high frequency. Such pattern was presumed to be specific to ZnSe x S 1Àx by the cited authors, who created for the occasion the terminology of a pseudo-two-mode behavior [20].…”

Section: Situation Around Zn(ses) and Its Previous Studiesmentioning

confidence: 99%

See 4 more Smart Citations

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Hussein

Pagès

Doyen-Schuler

et al. 2015

Journal of Alloys and Compounds

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Section: Zn-s and To Sesupporting

confidence: 52%

Section: Situation Around Zn(ses) and Its Previous Studiesmentioning

confidence: 97%

Section: Situation Around Zn(ses) and Its Previous Studiesmentioning

confidence: 97%

Section: The Percolation Model -The Current Picturementioning

confidence: 98%

Section: Situation Around Zn(ses) and Its Previous Studiesmentioning

confidence: 99%

See 3 more Smart Citations

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Hussein

Pagès

Doyen-Schuler

et al. 2015

Journal of Alloys and Compounds

View full text Add to dashboard Cite

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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