Optical band gap and refractive index dispersion parameters of boron-doped ZnO thin films: A novel derived mathematical model from the experimental transmission spectra

Alsaad, Ahmad; Al‐Bataineh, Qais M.; Ahmad, Ahmad A.; Albataineh, Zaid; Telfah, Ahmad

doi:10.1016/j.ijleo.2020.164641

Cited by 126 publications

(47 citation statements)

References 61 publications

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“…From Table 2 , it can be noticed that as filler concentration increased, the values of charge carriers/ m * for pure PVA film raised by up to 20 times from 3.68 * 10 55 to 109 * 10 55 atoms/m 3 , and the value of ԑ ∞ increased from 1.4 to 3.6, indicating that the increase of free charge carriers had vigorously participated in the polarization process. The values estimated for localized density of states ( N/m *) in the present work are comparable with those reported in the literature by other researchers using Equation (3) [ 60 , 61 ].…”

Section: Resultssupporting

confidence: 91%

“…Solids’ optical characteristics can be primarily explained by the CDF being linked to other detectable optical quantities using simple equations [ 67 ]. Previous studies emphasized that optical dielectric functions ( ε r and ε i ) are related to the density of localized electronic states within the forbidden gap of the composite films [ 60 , 61 , 67 ]. Using the ε i parameter with the help of ( N/m *) values, various important other parameters such as relaxation time ( τ ), plasma frequency ( ω p ), and electrical resistivity ( ρ ) can easily be estimated using the Drude free electron model:

…”

Section: Resultsmentioning

confidence: 99%

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Characteristics of Poly(vinyl Alcohol) (PVA) Based Composites Integrated with Green Synthesized Al3+-Metal Complex: Structural, Optical, and Localized Density of State Analysis

et al. 2021

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The influence of dispersing Al-metal complex on the optical properties of PVA was investigated using UV–visible spectroscopy. Polymer composite films with various Al3+-complex amounts in the PVA matrix were arranged by solution casting technique by means of distilled water as a widespread solvent. The formation of Al3+-metal complex was verified through Ultraviolet–visible (UV-Vis) and Fourier-transform infrared spectroscopy (FTIR) examinations. The addition of Al-complex into the polymer matrix led to the recovery of the optical parameters such as dielectric constant (εr and εi) and refractive index (n). The variations of real and imaginary parts of complex dielectric constant as a function of photon wavelength were studied to calculate localized charge density values (N/m*), high-frequency dielectric constant, relaxation time, optical mobility, optical resistivity, and plasma angular frequency (ωp) of electrons. In proportion with Al3+-complex content, the N/m* values were amplified from 3.68 × 1055 kg−1 m−3 to 109 × 1055 kg−1 m−3. The study of optical parameters may find applications within optical instrument manufacturing. The optical band gap was determined from Tauc’s equation, and the type of electronic transition was specified. A remarkable drop in the optical band gap was observed. The dispersion of static refractive index (no) of the prepared composites was analyzed using the theoretical Wemple–DiDomenico single oscillator model. The average oscillator energy (Eo) and oscillator dispersion energy (Ed) parameters were estimated.

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Section: Resultssupporting

confidence: 91%

…”

Section: Resultsmentioning

confidence: 99%

Characteristics of Poly(vinyl Alcohol) (PVA) Based Composites Integrated with Green Synthesized Al3+-Metal Complex: Structural, Optical, and Localized Density of State Analysis

et al. 2021

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“…These increasing values of both charge carriers/m* and the ε ∞ can be considered indicators of increasing free charge carriers that vigorously participate in the polarization process. In the current study, the values that were estimated for the localized density of states ( N/m* ) are in good accordance with those reported in the literature using Equation (7) [ 87 , 88 ].…”

Section: Resultssupporting

confidence: 91%

Polymer Composites with 0.98 Transparencies and Small Optical Energy Band Gap Using a Promising Green Methodology: Structural and Optical Properties

et al. 2021

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In this work, a green approach was implemented to prepare polymer composites using polyvinyl alcohol polymer and the extract of black tea leaves (polyphenols) in a complex form with Co2+ ions. A range of techniques was used to characterize the Co2+ complex and polymer composite, such as Ultraviolet–visible (UV-Visible) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The optical parameters of absorption edge, refractive index (n), dielectric properties including real and imaginary parts (εr, and εi) were also investigated. The FRIR and XRD spectra were used to examine the compatibility between the PVA polymer and Co2+-polyphenol complex. The extent of interaction was evidenced from the shifts and change in the intensity of the peaks. The relatively wide amorphous phase in PVA polymer increased upon insertion of the Co2+-polyphenol complex. The amorphous character of the Co2+ complex was emphasized with the appearance of a hump in the XRD pattern. From UV-Visible spectroscopy, the optical properties, such as absorption edge, refractive index (n), (εr), (εi), and bandgap energy (Eg) of parent PVA and composite films were specified. The Eg of PVA was lowered from 5.8 to 1.82 eV upon addition of 45 mL of Co2+-polyphenol complex. The N/m* was calculated from the optical dielectric function. Ultimately, various types of electronic transitions within the polymer composites were specified using Tauc’s method. The direct bandgap (DBG) treatment of polymer composites with a developed amorphous phase is fundamental for commercialization in optoelectronic devices.

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“…The obtained bandgap values corresponding to direct transitions are similar to those obtained by other researchers [56,57]. These optical properties of ZnO and SiO 2 films have proven to be very important for their use in metamaterial structures.…”

Section: Resultssupporting

confidence: 88%

Structural and optical characteristics determined by the sputtering deposition conditions of oxide thin films

Prepelita¹,

Garoi²,

Crăciun³

2021

Beilstein J. Nanotechnol.

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The influence of film thickness on the structural and optical properties of silicon dioxide (SiO2) and zinc oxide (ZnO) thin films deposited by radio frequency magnetron sputtering on quartz substrates was investigated. The deposition conditions were optimized to achieve stoichiometric thin films. The orientation of crystallites, structure, and composition were investigated by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), while the surface topography of the samples was analyzed using scanning electron microscopy (SEM). The optical characteristics were measured for samples with the same composition but obtained with different deposition parameters, such as increasing thickness. The optical constants (i.e., the refractive index n, the extinction coefficient k, and the absorption coefficient α) of the SiO2 and ZnO oxide films were determined from the transmission spectra recorded in the range of 190–2500 nm by using the Swanepoel method, while the energy bandgap was calculated from the absorption spectra. The influence of thickness on the structural and optical properties of the oxide films was investigated. Good optical quality and performance were noticed, which makes these thin films worthy of integration into metamaterial structures.

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Optical band gap and refractive index dispersion parameters of boron-doped ZnO thin films: A novel derived mathematical model from the experimental transmission spectra

Cited by 126 publications

References 61 publications

Characteristics of Poly(vinyl Alcohol) (PVA) Based Composites Integrated with Green Synthesized Al3+-Metal Complex: Structural, Optical, and Localized Density of State Analysis

Characteristics of Poly(vinyl Alcohol) (PVA) Based Composites Integrated with Green Synthesized Al3+-Metal Complex: Structural, Optical, and Localized Density of State Analysis

Polymer Composites with 0.98 Transparencies and Small Optical Energy Band Gap Using a Promising Green Methodology: Structural and Optical Properties

Structural and optical characteristics determined by the sputtering deposition conditions of oxide thin films

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