A developed model for the determination of the dielectric function for some absorbing thin films using pseudo-Urbach tail

Falahatgar, S.S.; Ghodsi, F. E.

doi:10.1016/j.physb.2012.12.011

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…where E t denotes the demarcation energy between the Urbach tail transitions and the band-to-band transitions and E u is the so-called Urbach energy, representing the width of tail states in the forbidden gap, with the TL or CL oscillator [34,35,60,61]. In some cases, this approach demonstrated an improved description of the optical dielectric response for the materials such as, for example, high-κ dielectric films [40,62,63], hydrogenated amorphous silicon nitride (a-SiN x :H) films [64] and titanium dioxide (TiO 2 ) thin films [65,66].…”

Section: Tauc-lorentz-lorentz-gaussian (Tllg) Modelmentioning

confidence: 99%

Modified Tauc–Lorentz dispersion model leading to a more accurate representation of absorption features below the bandgap

2015

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Section: Tauc-lorentz-lorentz-gaussian (Tllg) Modelmentioning

confidence: 99%

Modified Tauc–Lorentz dispersion model leading to a more accurate representation of absorption features below the bandgap

2015

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“…Several authors have used the Levenberg-Marquardt optimization algorithm. [7][8][9] Generally speaking, this method involves at least two steps: first, the assumed intervals are defined for each fitting parameters of dielectric function independently from the other parameters. Second, the dataset of the fitting parameters is produced by sub-dataset that is generated by the selection of an element from each interval.…”

Section: Introductionmentioning

confidence: 99%

Optical modeling and electrical properties of cadmium oxide nanofilms: Developing a meta–heuristic calculation process model

Ziabari

Sheikhani

Nezafat

et al. 2015

Journal of Applied Physics

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Cadmium oxide thin films were deposited onto glass substrates by sol–gel dip-coating method and annealed in air. The normal incidence transmittance of the films was measured by a spectrophotometer. D.C electrical parameters such as carrier concentration and mobility were analyzed by Hall Effect measurements. A combination of Forouhi–Bloomer & standard Drude model was used to simulate the optical constants and thicknesses of the films from transmittance data. The transmittance spectra of the films in the visible domain of wavelengths were successfully fitted by using the result of a hybrid particle swarm optimization method and genetic algorithm. The simulated transmittance is in good accordance with the measured spectrum in the whole measurement wavelength range. The electrical parameters obtained from the optical simulation are well consistent with those measured electrically by Hall Effect measurements.

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Modeling optical constants from the absorption of organic thin films using a modified Lorentz oscillator model

Dutta

Tiainen

Qureshi

et al. 2022

Opt. Mater. Express

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Optical constants of organic thin films can be evaluated using the Lorentz oscillator model (LOM) which fails to fit inhomogeneously broadened absorption of highly concentrated molecular films. In modified LOM (MLOM), the inhomogeneous broadening is implemented through a frequency-dependent adjustable broadening function. In this work, we evaluate the optical constants of rhodamine 6G doped poly-vinyl alcohol thin films with varying doping concentration (including also extensively high concentrations) using MLOM, which outperforms LOM by showing a better agreement with the experimental results. Our proposed method provides a way to accurately determine optical constants of isotropic organic thin films only from their absorption spectra without spectroscopic ellipsometry.

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A developed model for the determination of the dielectric function for some absorbing thin films using pseudo-Urbach tail

Cited by 4 publications

References 25 publications

Modified Tauc–Lorentz dispersion model leading to a more accurate representation of absorption features below the bandgap

Modified Tauc–Lorentz dispersion model leading to a more accurate representation of absorption features below the bandgap

Optical modeling and electrical properties of cadmium oxide nanofilms: Developing a meta–heuristic calculation process model

Modeling optical constants from the absorption of organic thin films using a modified Lorentz oscillator model

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