Local vibrational modes and Fano interaction in p-type ZnO : Sb system

Samanta, K.; Arora, Ashish; Katiyar, Ram S.

doi:10.1088/0022-3727/45/18/185304

Cited by 32 publications

(18 citation statements)

References 29 publications

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“…Furthermore, other modes present a decay similar to that of the E 2 (High) mode, which stops being the representative band, suggesting a deformation of the ZnO host lattice; this manipulation is observable with the change in the lattice parameters. An appreciable peak at approximately 275 cm −1 that corresponds to the spectrum of the R m = 0.00 sample is assigned in the literature as an activation mode against the impurities in the ZnO lattice, such as N, Sb and Ga . This finding does not correspond to our study because this mode appears for both the ZnO:Cd with R m = 0.25 and the undoped ZnO.…”

Section: Resultscontrasting

confidence: 61%

Optical and Structural Properties of ZnO and ZnO:Cd Particles Grown by the Hydrothermal Method

2015

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Here, we examine the structural, vibrational, optical, and morphological properties of ZnO particles synthesized by the hydrothermal method, incorporating cadmium at different concentrations through the molar ratio R m = Cd +2 /Zn +2 and a thermal treatment at 500°C. The X-ray diffraction results demonstrated the high crystallinity of the ZnO compound with a wurtzite-type hexagonal structure. The Raman scattering spectra demonstrated that the ZnO vibrational modes occur in the region between 200 and 1300 cm -1 , which is associated with different vibrational configurations characteristic of the ZnO molecule: E 2 (Low), E 2 (M), A 1 (TO) E 1 (TO), 2B 1 (High), E 2 (High), and TA + LO. The modes that were most affected by the incorporation of Cd 2+ were those assigned to 2E 2 (Low), E 2 (M), and 2B 1 (High), and this effect was associated with a greater displacement of Zn 2+ ions. The optical study showed a reduction in the band gap and a decrease in the crystalline quality due to the substitution of Cd 2+ in the ZnO lattice. Cadmium incorporation affected the morphology of the ZnO:Cd particles, changing the lengths and diameters of the ZnO rods; when the Cd concentration was increased, the ZnO rods shortened, forming coin-type hexagonal structures.R. E. Riman-contributing editor Manuscript No. 35528.

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Section: Resultscontrasting

confidence: 61%

Optical and Structural Properties of ZnO and ZnO:Cd Particles Grown by the Hydrothermal Method

2015

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“…The coupling strength (1/q) between phonon with continuum decreases with increasing temperature. The precise behavior of the continuum of states with temperature is not well known yet, however, a smaller intrinsic lifetime of phonons at high temperatures could be responsible for the reduced continuumephonon coupling [19]. The negative value of q indicates that the scattering intensity is greater towards the lower energy side of the peak [20].…”

Section: Resultsmentioning

confidence: 99%

Order–disorder transition and Fano-interference in thermoelectric Cu3SbSe3 nanoparticles

Samanta

Gupta

Kaur

et al. 2015

Materials Chemistry and Physics

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“…Wurtzite ZnO belongs to C6V (P63mc) space group for which the possible vibrational modes [60] workers and assigned to B 1 low, E 2H -E 2L , B 1 high and transverse acoustic (TA) + longitudinal acoustic (LA) modes, respectively [56,63,64]. The peak at 486.9 cm −1 has been attributed to surface optical phonons from earlier works [62]. The peak at 270.7 cm −1 is the laser plasma line [60] while the peak at 583.8 cm −1 assigned to E 1 (LO) has been inferred to arise from the formation of defects of oxygen vacancies [60,65,66].…”

Section: Resultsmentioning

confidence: 99%

Morphological manipulation of the nonlinear optical response of ZnO thin films grown by thermal evaporation

Shaik

Kumar

Krishna

et al. 2014

Mater. Res. Express

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ZnO thin films with different micro-/nano-structured morphologies have been fabricated using thermal evaporation technique. The micro-/nano-structures ranged from dense grains to nanorods and nanowires. The fabricated films were characterized using x-ray diffraction and field emission scanning electron microscopy (FE-SEM) techniques for determining their crystalline behavior and evaluating their morphology, respectively. Photoluminescence (PL) studies revealed two emission peaks in these films, one in the UV region due to exciton emission and the other in the visible spectral region due to Zn or Oxygen vacancies/defects. The effect of these different micro-/nano-structures on the third-order nonlinear optical (NLO) response has been scrutinized using the Zscan technique with femtosecond (fs), MHz and picosecond (ps), kHz pulses at a wavelength of 800 nm. Various NLO coefficients such as two-photon absorption (β), nonlinear refractive index (n 2), Re [χ (3) ], Im [χ (3) ] and χ (3) were evaluated. The obtained χ (3) values were ∼10 −7 e.s.u. in the fs regime and ∼10 −10 e.s.u. in the ps regime. Optical limiting studies of these films were also performed and limiting thresholds were estimated to be 15-130 μJ cm −2 in the fs regime while in ps regime the corresponding values were 1-3 J cm −2. The NLO data clearly designates strong third-order nonlinearities in these ZnO thin films with possible applications in photonics.

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Local vibrational modes and Fano interaction in p-type ZnO : Sb system

Cited by 32 publications

References 29 publications

Optical and Structural Properties of ZnO and ZnO:Cd Particles Grown by the Hydrothermal Method

Optical and Structural Properties of ZnO and ZnO:Cd Particles Grown by the Hydrothermal Method

Order–disorder transition and Fano-interference in thermoelectric Cu3SbSe3 nanoparticles

Morphological manipulation of the nonlinear optical response of ZnO thin films grown by thermal evaporation

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