Journal ArticleDOI
Size dependence of optical properties in solution-grown Pb1?xFexS nanoparticle films
TLDR
The optical band gap of Pb1−xFexS solution-grown nanoparticle films was varied from 2.65 to 2.22 eV with an increase in iron concentration 0.25 ≤ x ≤ 0.75 as discussed by the authors.Abstract:
The optical band gap (Eg) of Pb1−xFexS solution-grown nanoparticle films was varied from 2.65 to 2.22 eV with an increase in iron concentration 0.25 ≤ x ≤ 0.75 in films grown at fixed pH and temperature by the chemical bath deposition method. The presence of excitonic structure in the ternary Pb1−xFexS for x ≥ 0.50 suggests increasing binding energy with increase in iron concentration in the films. A shift of excitonic peak towards higher energy with an increase in iron concentration is also observed.read more
Citations
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Effect of deposition temperature on the structural and optical properties of chemically prepared nanocrystalline lead selenide thin films.
TL;DR: It was found that average crystallite size, as calculated from Scherrer’s formula, increased from 23 to 33 nm as the deposition temperature was varied from 303 to 343 K, and the dislocation density and microstrain were found to vary inversely with the crystalliteSize, whereas the lattice constant was found to increase with an increase in crystallite Size.
Journal ArticleDOI
Band gap engineering in PbS nanostructured thin films from near-infrared down to visible range by in situ Cd-doping
TL;DR: In this paper, the modification of optical band gap of PbS nanostructured films over a wide spectral range (∼475-1000nm) due to in situ Cd-doping and size confinement was reported.
Journal ArticleDOI
Effects of crystal and electronic structures of ANb2O6 (A=Ca, Sr, Ba) metaniobate compounds on their photocatalytic H2 evolution from pure water
TL;DR: In this paper, the authors used X-ray diffraction, field-emission electron microscopy (FE-SEM), and UV-vis diffuse reflectance spectroscopy, and fluorescence spectra to investigate the electronic band structures and photocatalytic activities of alkali-earth metaniobate compounds.
Journal ArticleDOI
Physical properties of pulse electrodeposited lead sulfide thin films
TL;DR: In this article, a cuboctahedral morphology was proposed for the PbS nanoparticles and the stability of the nanoparticles was attributed to the surface configuration of Pb and S atoms causing low surface energy.
Journal ArticleDOI
Studies on p-type copper (I) selenide crystalline thin films for hetero-junction solar cells
TL;DR: In this paper, a direct-type transition with band gap energy of 1.73 eV was reported from optical absorption studies, which may find interesting applications in hetero-junction solar cells as an absorber layer.
References
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Journal ArticleDOI
Quantum size effects in the redox potentials, resonance Raman spectra, and electronic spectra of CdS crystallites in aqueous solution
Journal ArticleDOI
PbS in polymers. From molecules to bulk solids
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.
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Three-dimensional quantum-size effect in chemically deposited cadmium selenide films.
TL;DR: Structural studies of the as-deposited layers showed them to be composed of microcrystalline, cubic CdSe, and electron microscopy resolved them into individual crystallites of typically 40\char21{}80-A\r{} diameter, depending on deposition temperature, the first example reported of a three-dimensional quantum-size effect in a film.
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Higher excited electronic states in clusters of ZnSe, CdSe, and ZnS: Spin‐orbit, vibronic, and relaxation phenomena
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.
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Comparison between calculated and experimental values of the lowest excited electronic state of small CdSe crystallites
P. E. Lippens,Michel Lannoo +1 more
TL;DR: On considere deux types de forme cristalline et une constante dielectrique variant dans l'espace d'analyses en bon accord avec les experiences recentes.