Variable optical absorption edge in ion beam sputtered thin ytterbium oxide films

Krishna, M. Ghanashyam; Pillier, John; Bhattacharya, Atanu

doi:10.1016/s0040-6090(99)00655-0

Cited by 36 publications

(6 citation statements)

References 8 publications

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“…The maximum transmittance spectrum of samples shows a 70% transparency in the visible and near infrared region. Many formulas have been proposed to obtain the absorption coefficient of the films on transparent substrates [13][14][15]. From the transmittance and reflectance spectra using the Manifacier model [15], the absorption coefficients α of the material can be obtained from the equation:…”

Section: Resultsmentioning

confidence: 99%

Preparation and optical properties of AgGaS₂ nanofilms

Zhang

Huang

2011

Cryst. Res. Technol.

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In this paper, AgGaS 2 nanofilms have been prepared by a two-step process involving the successive ionic layer absorption and reaction (SILAR) and annealing method. Using AgNO 3 , GaCl 3 and Na 2 S 2 O 3 as reaction sources, the mixture films were firstly deposited on quartz glass substrates at room temperature, and then annealed in Ar environment at 200-500 °C for 4 h, respectively. The effects of annealing temperature on structural and optical properties were investigated by XRD, UV-Vis, EDS and photoluminescence (PL) spectra. It was revealed in XRD results that α-Ag 9 GaS 6 was contained in the samples annealed at 200 °C, and this phase was decreased with increase of the annealing temperatures. When the sample was annealed at above 400 °C, the chalcopyrite AgGaS 2 nanofilm was obtained. The preferred orientation was exhibited along the (112) plane. It was shown in atomic force microscopy (AFM) results that the grain sizes in AgGaS 2 nanofilms were 18-24 nm and the thin films were smooth and strongly adherent to the substrates. When the annealing temperature was higher than 400 °C, it is an optimum condition to improve the structural and optical properties of the AgGaS 2 thin films. The room temperature PL spectra of AgGaS 2 nanofilms showed prominent band edge emission at 2.72 eV. Based on all results mentioned above, it can be concluded that the SILAR-annealing method is preferable to preparing high-quality AgGaS 2 nanofilms.

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Section: Resultsmentioning

confidence: 99%

Preparation and optical properties of AgGaS₂ nanofilms

Zhang

Huang

2011

Cryst. Res. Technol.

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“…The film of the poly( N -benzylaniline) was prepared by evaporating the solvent from a solution of the compound with subsequent drying of the film deposited on quartz substrate. The poly( N -benzylaniline) solution was homogenized for 4 h and then rotated for homogeneous mixing. − The film prepared was left to dry at 25 °C for 48 h. The film thickness was obtained as ∼110 nm. − For the annealing processes of the film, a proper annealing atmosphere was selected. The film was annealed at various temperatures (55, 115, and 145 °C) in atmosphere with use of a furnace for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…The poly(N-benzylaniline) solution was homogenized for 4 h and then rotated for homogeneous mixing. [12][13][14] The film prepared was left to dry at 25 °C for 48 h. The film thickness was obtained as ∼110 nm. [12][13][14] For the annealing processes of the film, a proper annealing atmosphere was selected.…”

Section: Methodsmentioning

confidence: 99%

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Optical Properties of the Poly(N-benzylaniline) Thin Film

2005

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The optical properties of the poly(N-benzylaniline) thin film were investigated by optical characterization. The optical constants such as refractive index and dielectric constant were determined from the transmittance and reflectance spectra of the film. The refractive index dispersion was analyzed by the Wemple-DiDomenico model. The n(infinity) values changed from 6.37 to 5.71 and these values did not show any certain trend with annealing temperatures. The average oscillator parameter So value, which is the strength of the individual dipole oscillator, was found to be in the range of 1.15 x 10(13) to 1.03 x 10(13) m(-2). The optical band was determined from the direct optical transitions in K space. The optical band Eg of the film decreases from 2.089 to 2.046 eV with increasing annealing temperatures while the Urbach energy Eu called the width of localized states in the optical band gap increases from 0.544 to 0.598 eV. Consequently, the optical constants and optical band gap of the poly(N-benzylaniline) change with the annealing temperatures.

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“…The observed dispersion behavior of PHTP film can be explained if it is assumed to be the response of a set of Lorentzian oscillators of adjustable strength and position [29]. Using this postulation, the refractive index as a function of photon energy can be analyzed on the basis of the single oscillator model, for photon energies below the interband absorption edge.…”

Section: Single Oscillator Parametersmentioning

confidence: 99%

Synthesis and Calculation of Some Linear Optical Properties and the Oscillator Strength Parameters of a New Azo Dye Polymer Compound

Nattiq¹

2014

ETJ

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In this paper, azo dye polymer materials was synthesis from P-toludine with Novolac by Fox method. The optical properties of an azo dye polymer film with thickness 10µm have been investigated by the transmittance and absorbance spectra in the wavelength range (300-900 nm). The linear optical parameters such as refractive index (n) , extinction coefficient (k) , absorption coefficient (α) , real and imaginary parts of dielectric constant were calculated. The optical energy gap was estimated from the absorption coefficient using TaueP , P s procedure. The oscillator energy (ER 0 R), dispersion energy(ER d R) and the static refractive index (nR o R) have been determined by the Wemple-DiDomenico method.

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Variable optical absorption edge in ion beam sputtered thin ytterbium oxide films

Cited by 36 publications

References 8 publications

Preparation and optical properties of AgGaS₂ nanofilms

Preparation and optical properties of AgGaS₂ nanofilms

Optical Properties of the Poly(N-benzylaniline) Thin Film

Synthesis and Calculation of Some Linear Optical Properties and the Oscillator Strength Parameters of a New Azo Dye Polymer Compound

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Variable optical absorption edge in ion beam sputtered thin ytterbium oxide films

Cited by 36 publications

References 8 publications

Preparation and optical properties of AgGaS2 nanofilms

Preparation and optical properties of AgGaS2 nanofilms

Optical Properties of the Poly(N-benzylaniline) Thin Film

Synthesis and Calculation of Some Linear Optical Properties and the Oscillator Strength Parameters of a New Azo Dye Polymer Compound

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Product

Resources

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Preparation and optical properties of AgGaS₂ nanofilms

Preparation and optical properties of AgGaS₂ nanofilms