Optical investigation of porous TiO2 in mesostructured solar cells

Abdellatif, Sameh O.; Josten, Sabine; Sharifi, Parvin; Kirah, Khaled; Ghannam, Rami; Khalil, Ahmed S. G.; Erni, Daniel; Marlow, Frank

doi:10.1117/12.2288376

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…For the sake of thickness investigation, the SEM measurements in Fig. 10 (a demonstrated a top surface view, while b shows an edge view for thickness estimation) were conducted, showing an average film thickness of 178.45 μm, with the aid of the post-image processing technique and the correction factors introduced in our previous work in 65 . SEM measurement in Fig.…”

Section: Resultsmentioning

confidence: 99%

Optical investigation and computational modelling of BaTiO3 for optoelectronic devices applications

Elmahgary

Mahran

Ganoub

et al. 2023

Sci Rep

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ABX3 perovskite-based materials have attracted research attention in various electronic and optoelectronic applications. The ability to tune the energy band gap through various dopants makes perovskites a potential candidate in many implementations. Among various perovskite materials, BaTiO3 has shown great applicability as a robust UV absorber with an energy band gap of around 3.2 eV. Herein, we provide a new sonochemical-assisted solid-phase method for preparing BaTiO3 thin films that optoelectronic devices can typically be used. BaTiO3 nano-powder and the thin film deposited on a glass substrate were characterized using physicochemical and optical techniques. In addition, the work demonstrated a computational attempt to optically model the BaTiO3 from the atomistic level using density functional theory to the thin film level using finite difference time domain Maxwell's equation solver. Seeking repeatability, the dispersion and the extinction behavior of the BaTiO3 thin film have been modeled using Lorentz-Dude (LD) coefficients, where all fitting parameters are listed. A numerical model has been experimentally verified using the experimental UV–Vis spectrometer measurements, recording an average root-mean-square error of 1.44%.

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Section: Resultsmentioning

confidence: 99%

Optical investigation and computational modelling of BaTiO3 for optoelectronic devices applications

Elmahgary

Mahran

Ganoub

et al. 2023

Sci Rep

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“…Manual as well as automated Dr Blade screen printing can be utilized, as a sol-gel method, to deposit thin film of TiO2 layer in micrometer range as previously discussed in [28]. In such context, diluted paste with isopropanol can be managed to tune the thin film thickness [27]. The large variation between the refractive index of TiO2, nearly 1.78, and that of Si, around 3.9 [26], negatively contribute to the detected width of the band-gap.…”

Section: Refractive Index Contrast Optimizationmentioning

confidence: 99%

“…The fabrication of PCs structures depends on the contrast between dielectric materials and semiconductor materials (refractive index contrast) which influences the optical properties of the structure [24]. This paper will discuss 1D PCs [25] as well as 2D grating structure for solar cells utilization Additionally, other new generations of solar cells, namely dye sensitized solar cells and perovskites solar cells, showed enhanced performance with embedding two-dimensional colloidal crystal structures [26][27][28][29]. Such colloidal crystal structures are not only acting to enhance the photon capturing of the active layer of solar cells, but can be integrated for decorative purposes [29].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, other new generations of solar cells, namely dye sensitized solar cells and perovskites solar cells, showed enhanced ASTESJ ISSN: 2415-6698 performance with embedding two-dimensional colloidal crystal structures [26][27][28][29]. Such colloidal crystal structures are not only acting to enhance the photon capturing of the active layer of solar cells, but can be integrated for decorative purposes [29].…”

Section: Introductionmentioning

confidence: 99%

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Investigating the Optical Behavior of Single/Multi-Dimensional Photonic Crystal Structures for Photovoltaic Applications

Alsayed¹,

Ismail²,

Abdellatif³

2020

Adv. sci. technol. eng. syst. j.

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The results investigated in this work are toward the optimization of the photonic crystal structures in 1D and 2D scale. One-dimensional distributed Bragg reflectors (DBRs) have demonstrated substantial potential in various optoelectronic applications, due to the observed tunable optical band-gap. Herein, the use of DBRs in light trapping solar cells was simulated and validated, representing its effect as a back reflector structure. In terms of the layer thickness, material selection and number of layer, the optimized DBR structure was modeled and evaluated with respect to previously published numerical and experimental data. The proposed model is capable of designing photonic crystal structures with tunable band-gap varies from 400 nm to 700 nm while controlling the pass-band in both Visible and Near Infra-red regions. On the other hand, 2D grating structure has been simulated where the transmission spectra under various design dimensions have been investigated. Finally, thin film deposition is utilized for experimental validation to our proposed optical model.

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Modeling disorder in two-dimensional colloidal crystals based on electron microscope measurements

et al. 2020

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Self-assembled two-dimensional colloidal crystals (CCs) are critical components in many optical and optoelectronic devices. Such structures usually exhibit various types of disorder, which sometimes can be beneficial for the desired applications. However, disorder poses challenges to the modeling of two-dimensional structures. In this work, two-dimensional CCs employed in optoelectronic devices, especially dye-sensitized solar cells, are investigated. scanning electron microscope (SEM) images were used to quantify the disorder in the studied structures. As a basis for simulations, disordered model patterns were generated with properties extracted from the SEM images of prepared samples. Optical modeling was performed with a finite-difference time-domain simulator. The simulated transmission data are consistent with the experimentally measured spectra.

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Optical investigation of porous TiO2 in mesostructured solar cells

Cited by 4 publications

References 17 publications

Optical investigation and computational modelling of BaTiO3 for optoelectronic devices applications

Optical investigation and computational modelling of BaTiO3 for optoelectronic devices applications

Investigating the Optical Behavior of Single/Multi-Dimensional Photonic Crystal Structures for Photovoltaic Applications

Modeling disorder in two-dimensional colloidal crystals based on electron microscope measurements

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