Structural and optical properties of thermally annealed TiO2–SiO2 binary thin films synthesized by sol–gel method

Amin, Peshawa O.; Kadhim, Asmaa J.; Ameen, Majida A.; Abdulwahid, Rebar T.

doi:10.1007/s10854-018-9688-6

Cited by 22 publications

(8 citation statements)

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“…Band-to-band transitions are associated with fundamental absorption, taking the form of a fast rise in absorption called the absorption edge. This edge is a measure of the optical BG energy [ 36 , 37 ]. The extent of absorption is based on an absorption coefficient α ( υ ), indicating the relative rate at which the incident light intensity attenuates in a unit length of the medium [ 11 , 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

“…The extent of absorption is based on an absorption coefficient α ( υ ), indicating the relative rate at which the incident light intensity attenuates in a unit length of the medium [ 11 , 38 , 39 ]. Determination of the ( υ ) at the equivalent frequency (υ) from the absorbance spectra A ( υ ) can be performed using Beer–Lambert law [ 6 , 36 , 37 ]:

where the incident light and transmitted light intensities are denoted by I o and I, respectively, and the sample thickness is represented by d. Figure 5 shows α ( υ ) against photon energy ( hυ ) for pure PVA and PVA films doped with CeO 2 samples. The absorption edge values can be calculated by extrapolating the linear part to zero of the ordinate.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of PVA/CeO2 Based Nanocomposites with Tuned Refractive Index and Reduced Absorption Edge: Structural and Optical Studies

et al. 2021

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In the current study, polymer nanocomposites (NCPs) based on poly (vinyl alcohol) (PVA) with altered refractive index and absorption edge were synthesized by means of a solution cast technique. The characterization techniques of UV–Vis spectroscopy and XRD were used to inspect the structural and optical properties of the prepared films. The XRD patterns of the doped samples have shown clear amendments in the structural properties of the PVA host polymer. Various optical parameters were studied to get more insights about the influence of CeO2 on optical properties of PVA. On the insertion of CeO2 nanoparticles (NPs) into the PVA matrix, the absorption edge was found to move to reduced photon energy sides. It was concluded that the CeO2 nanoparticles can be used to tune the refractive index (n) of the host polymer, and it reached up to 1.93 for 7 wt.% of CeO2 content. A detailed study of the bandgap (BG) was conducted using two approaches. The outcomes have confirmed the impact of the nanofiller on the BG reduction of the host polymer. The results of the optical BG study highlighted that it is crucial to address the ɛ” parameter during the BG analysis, and it is considered as a useful tool to specify the type of electronic transitions. Finally, the dispersion region of n is conferred in terms of the Wemple–DiDomenico single oscillator model.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis of PVA/CeO2 Based Nanocomposites with Tuned Refractive Index and Reduced Absorption Edge: Structural and Optical Studies

et al. 2021

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“…The optical dielectric constant ( ) is a frequency dependent parameter and shows the electronic response to the incident photon in the material. Meanwhile, the dielectric constant is a complex function and its real part is assigned to polarization upon the impact of an electromagnetic field whereas the imaginary part illustrates the optical loss and is described by the following equations [ 51 ] where represents the real part and represents the imaginary part of the dielectric constant. Figure 7 a, b shows the fluctuation of optical dielectric constant with respect to the wavelength from 200 to 1100 nm.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, spectroscopic, electrochemical and photophysical properties of high band gap polymers for potential applications in semi-transparent solar cells

Amin¹,

Ketuly

Saeed³

et al. 2021

BMC Chemistry

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Background The design of new polymers able to filter the electromagnetic spectrum and absorb distinctly in the UV and high-energy part of visible spectrum is crucial for the development of semi-transparent solar cells. Herein, we report on the synthesis and spectroscopic, electrochemical, and photophysical characteristics of three new polymers, namely (i) Poly(triamterene-co-terephthalate), (ii) Poly[triamterene-co- 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine-p,p′-disulfonamide], and (iii) Poly(5-hydroxyindole-2-carboxylate) that might show promise as materials for semi-transparent solar cells. Results The energy band gap, refractive index, dielectric constant, and optical conductivity of the electron donor polymer, poly(triamterene-co-terephthalate), were determined to be 2.92 eV, 1.56, 2.44 and 2.43 × 104 S cm−1, respectively. The synthesized electron acceptor polymers showed a relatively high refractive index, dielectric constant, and optical conductivity. The presence of a direct allowed transition was confirmed between intermolecular energy bands of the polymers. Conclusions The polymers showed relatively high energy gap and deep HOMO levels, making them strong absorbers of photons in the UV region and high energy part of the visible region. The synthesized donor and acceptors performed well relative to P3HT and fullerenes due to the close match of the HOMO and LUMO levels. With further development, the polymers could be viable for use as the active layers of semi-transparent solar cells.

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“…It can be clearly seen from Fig. 7 that the three layer coating of ZnAl 2 O 4 nanosheets exhibits superior transmittance of 93 %, since ZnAl 2 O 4 scatters photons of irradiated light in maximum amounts so as more photons can pass through the glass slide substrate [25][26][27][28][29]. It can be clearly seen from Fig.…”

Section: Resultsmentioning

confidence: 99%

Development of sol-gel derived gahnite anti-reflection coating for augmenting the power conversion efficiency of polycrystalline silicon solar cells

Kaliyannan¹,

Palanisamy²,

Manivasakan

et al. 2019

Materials Science-Poland

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The present research is focused on developing ZnAl2O4 (gahnite) spinel as an antireflection coating material for enhanced energy conversion of polycrystalline silicon solar cells (PSSC). ZnAl2O4 has been synthesized using dual precursors, namely aluminum nitrate nonahydrate and zinc nitrate hexahydrate in ethanol media. Diethanolamine has been used as a sol stabilizer in sol-gel process for ZnAl2O4 nanosheet fabrication. ZnAl2O4 nanosheet was deposited layer-by-layer (LBL) on PSSC by spin coating method. The effect of ZnAl2O4 coating on the physical, electrical, optical properties and temperature distribution in PSSC was investigated. The synthesized antireflection coating (ARC) material bears gahnite (ZnAl2O4) spinel crystal structure composed of two dimensional (2D) nanosheets. An increase in layer thickness proves the LBL deposition of ARC on the PSSC substrate. The ZnAl2O4 2D nanosheet comprising ARC on the PSSC was tested and it exhibited a maximum of 93 % transmittance, short-circuit photocurrent of 42.364 mA/cm2 and maximum power conversion efficiency (PCE) 23.42 % at a low cell temperature (50.2 °C) for three-layer ARC, while the reference cell exhibited 33.518 mA/cm2, 15.74 % and 59.1 °C, respectively. Based on the results, ZnAl2O4 2D nanosheets have been proven as an appropriate ARC material for increasing the PCE of PSSC.

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Structural and optical properties of thermally annealed TiO2–SiO2 binary thin films synthesized by sol–gel method

Cited by 22 publications

References 64 publications

Synthesis of PVA/CeO2 Based Nanocomposites with Tuned Refractive Index and Reduced Absorption Edge: Structural and Optical Studies

Synthesis of PVA/CeO2 Based Nanocomposites with Tuned Refractive Index and Reduced Absorption Edge: Structural and Optical Studies

Synthesis, spectroscopic, electrochemical and photophysical properties of high band gap polymers for potential applications in semi-transparent solar cells

Development of sol-gel derived gahnite anti-reflection coating for augmenting the power conversion efficiency of polycrystalline silicon solar cells

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