Pb1−xFexS nanoparticle films grown from acidic chemical bath
TL;DR: Pb1−xFexS (x=0.25, 0.50, and 0.75) films were grown from an acidic chemical bath as mentioned in this paper and were structurally characterized by XRD and TEM.
About: This article is published in Applied Surface Science.The article was published on 2004-12-15. It has received 7 citations till now. The article focuses on the topics: Band gap & Quantum dot.
Citations
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TL;DR: In this paper, PbS nanocrystalline thin films were deposited on glass substrates using chemical bath technique at different solution temperatures and various deposition times, the thickness of the films was in the range 600- 1000 nm.
57 citations
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TL;DR: In this paper, Nanocrystalline PbS thin films were deposited on glass substrates with various deposition times using chemical bath deposition technique and the crystalline size of these films was studied by atomic force microscope AFM.
47 citations
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SIDI1
TL;DR: In this article, a theoretical study of the optical properties of Pb 0.25 Mn 0.125 S in the framework of the density functional theory using the linearized-augmented plane-wave method is reported in order to predict new optical materials for continuous-wave lasers.
24 citations
01 Jan 2010
TL;DR: In this paper, the influence of deposition time (2, 3, 6 and 8 days) on the properties of thin films was investigated by X-ray diffraction and atomic force microscopy, respectively.
Abstract: Manganese sulfide thin films were chemically deposited from an aqueous solution containing manganese sulfate, sodium thiosulfate and sodium tartrate. The influence of deposition time (2, 3, 6 and 8 days) on the properties of thin films was investigated. The structure and surface morphology of the thin films were studied by X-ray diffraction and atomic force microscopy, respectively. In addition, in order to investigate the optical properties of the thin films, the UV-visible spectrophotometry was used. The XRD results indicated that the deposited MnS2 thin films exhibited a polycrystalline cubic structure. The number of MnS2 peaks on the XRD patterns initially increased from three to six peaks and then decreased to five peaks, as the deposition time was increased from 2 to 8 days. From the AFM measurements, the film thickness and surface roughness were found to be dependent on the deposition time.
6 citations
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TL;DR: In this paper, the influence of different growth conditions on the properties of films using pulsed laser deposition was discussed and the obtained experimental results from published articles were discussed and analyzed, so that readers can know that this method could be used to prepare binary, ternary and quaternary films.
Abstract: In recent years, much attention has been emphasized on research to produce thin films using pulsed laser deposition. Therefore, the main objectives in this review were to address some important points such as the influence of different growth conditions on the properties of films using this method. The advantage of this method was discussed which including it could control the dimensions and display good crystallinity. The obtained experimental results from published articles were discussed and analyzed. So that, readers can know that this method could be used to prepare binary, ternary and quaternary films. Lastly, the power conversion efficiency of fabricated solar cells was reported in order to study these films could be applied in solar cell applications.
5 citations
References
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01 Jan 1956
TL;DR: In this article, the authors present a chemical analysis of X-ray diffraction by Xray Spectrometry and phase-diagram Determination of single crystal structures and phase diagrams.
Abstract: 1. Properties of X-rays. 2. Geometry of Crystals. 3. Diffraction I: Directions of Diffracted Beams. 4. Diffraction II: Intensities of Diffracted Beams. 5. Diffraction III: Non-Ideal Samples. 6. Laure Photographs. 7. Powder Photographs. 8. Diffractometer and Spectrometer. 9. Orientation and Quality of Single Crystals. 10. Structure of Polycrystalline Aggregates. 11. Determination of Crystal Structure. 12. Precise Parameter Measurements. 13. Phase-Diagram Determination. 14. Order-Disorder Transformation. 15. Chemical Analysis of X-ray Diffraction. 16. Chemical Analysis by X-ray Spectrometry. 17. Measurements of Residual Stress. 18. Polymers. 19. Small Angle Scatters. 20. Transmission Electron Microscope.
17,428 citations
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TL;DR: In this article, the authors developed two theoretical models, including the effect of band nonparabolicity, that successfully explain the observed size dependence down to about 25 A. The electron-hole-in-a-box model with effective mass approximation cannot explain the observation size dependence.
Abstract: The transition of PbS from molecular to bulk form has been observed in polymer films. As the particle size decreases the band gap shifts to the blue and eventually approaches the transition energy of the first allowed excited state, X→A, of a PbS molecule. Discrete absorption bands also appear. The electron‐hole‐in‐a‐box model with effective mass approximation cannot explain the observed size dependence. We have developed two theoretical models, both including the effect of band nonparabolicity, that successfully explain the observed size dependence down to about 25 A.
787 citations
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TL;DR: In this article, a comparison of sulfide and selenide spectra enables observation of the effect of changes in the highest occupied molecular orbitals upon cluster electronic properties, and it is shown that the energy spectrum of discrete hole states is controlled by the spin-orbit energy and the isotropic hole mass in small, highly symmetrical clusters.
Abstract: Metal selenide clusters have been made and characterized, using the arrested precipitation colloidal technique. A comparison of sulfide and selenide spectra enables observation of the effect of changes in the highest occupied molecular orbitals upon cluster electronic properties. The first and second excited electronic states are both observed as a function of size in ZnSe clusters. The systematic dependence of the spectra lead to assignment of the higher state to a 1S‐type hole based upon the split‐off valence band. It is shown that the energy spectrum of discrete hole states is controlled by the spin‐orbit energy and the isotropic hole mass in small, highly symmetrical clusters. This result contrasts with the heavy hole and light hole states observed for planar confinement. In ≂ 20 A diameter ZnS clusters, there is a strong vibronic temperature dependence in the excited state spectra, while in clusters of smaller gap materials such vibronic effects are very minor. We conjecture that lifetime broadening ...
239 citations
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TL;DR: Calcul variationnel simple de l'energie d'excitation des microc Cristaux de CdS dans un microcristal a barrieres de potentiel finies d'un systeme electron-trou dan un microCristal.
Abstract: Calcul variationnel simple de l'energie de l'etat fondamental d'un systeme electron-trou dans un microcristal a barrieres de potentiel finies. Effet important de la penetration de la fonction d'onde sur le domaine de confinement important, coherent avec le deplacement vers le bleu observe a propos de l'energie d'excitation des microcristaux de CdS
142 citations