Effect of isotope substitution and doping on the Raman spectrum of galena (PbS)

Sherwin, Richard K.; Clark, Robin J. H.; Lauck, R.; Cardona, M.

doi:10.1016/j.ssc.2005.02.026

Cited by 50 publications

(41 citation statements)

References 17 publications

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“…In general, a decreasing of both ID when GS increases can be observed with, roughly, a linear inverse dependence, independent if V [Ni 2+ ] is either ISRN Nanotechnology decreasing or increasing. As above, no dependence between ID and GS has been found in theoretical approaches and experimental findings on doped and undoped nanocrystals reported in the literature, except a couple of experimental works [25,26] with no further explanation. The strong strains introduced by the foreign ions promote changes in the interatomic distances and hence in the ID.…”

Section: Resultsmentioning

confidence: 84%

Properties of PbS: Ni²⁺ Nanocrystals in Thin Films by Chemical Bath Deposition

Moreno

Lima

Portillo

et al. 2012

ISRN Nanotechnology

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The growth of nanocrystalline PbS films by chemical bath deposition (CBD) onto glass at temperature T = 20 ± 2• C is presented in this research. We report on the modification of structural, optical, and electrical nanostructures due to in situ Ni-doping. The morphological changes of the layers were analyzed using SEM, AFM, and TEM. XRD spectra displayed peaks at 2θ = [26. 00, 30.07, 43.10, 51.00, 53.48], indicating growth on the zinc blende face. The grain size determined by X-rays diffraction of the undoped samples was ∼36 nm, whereas with the doped sample was 3.2-5 nm. By TEM, the doped PbS was found crystalline films in the range 3.5-5 nm. Optical absorption (OA), and forbidden bandgap energy (E g ) shift disclose a shift in the range 2.1-3.8 eV. Likewise, the dependence of E g with the radius size and interplanar distance of the lattice is discussed. Raman spectroscopy (RS) exhibited an absorption band ∼135 cm −1 displaying only a PbS ZB structure. The thermal energy for the films was determined from the slope of dark conductivity (DC) and the energy was estimated to be 0.15 to 0.5 eV.

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Section: Resultsmentioning

confidence: 84%

Properties of PbS: Ni²⁺ Nanocrystals in Thin Films by Chemical Bath Deposition

Moreno

Lima

Portillo

et al. 2012

ISRN Nanotechnology

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“…For a discussion of the dependence of the observed shift with temperature we therefore concentrate on the high-wavenumber feature at ∼ 430 cm −1 . This feature shifts up in frequency with increasing temperatures (an unusual sign of the shift [9]) Note that the 210 cm −1 peak, and that at 150 cm −1 , both show the usual down-shift with increasing temperatures [8]. can be easily seen with the naked eye.…”

Section: Methodsmentioning

confidence: 84%

“…The data in Refs. [8,11], which were not taken at low temperatures, did not allow a clear identification of the shoulder at about ∼ 220 cm −1 which could be due to two-phonon scattering. In fact, both features at ∼ 205 − 210 cm −1 could correspond to two-phonon scattering, and it is hard to distinguish this assignment from that to a forbidden LO scattering situation.…”

Section: Comparison With the Experiments And Discussionmentioning

confidence: 98%

Temperature‐dependent Raman scattering of natural and isotopically substituted PbS

Etchegoin

Cardona

Lauck

et al. 2008

Physica Status Solidi (b)

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Lead sulfide is an important semiconductor that has found technological applications for over a century. Raman spectroscopy, a standard tool for the investigation and characterization of semiconductors, has limited application to this material because of the forbidden nature of its first order scattering and its opacity to visible lasers. Nevertheless, useful vibrational spectra from two-phonon processes are obtained with red lasers, probably because of a resonance in the concomitant electronic transitions. Here we report temperature dependent spectra, covering the 10-300 K range, for two samples with different sulfur isotopic compositions. The results are analyzed by comparison with ab initio calculations of the lattice dynamics of PbS and the corresponding densities of one and two-phonon states. Emphasis is placed on the analysis of the two phonon band centered at ∼ 430 cm −1 .

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“…However, at the NaCl phases of all PbX, the forbidden first-order spectra preceding surface oxidation were still established under the variation of the laser line or the increase in laser power. [9][10][11][12][13][14][15][16][17][18][19] In the present work, we investigated the above phase transition in Pb 1-x Sn x Se (x=0.125) by Raman spectroscopy under a pressure of up to 6 GPa. Sn dopant was reported to decrease the transition pressure from 4.5 to 3 GPa.…”

Section: Introductionmentioning

confidence: 99%