Optical Properties of Semiconducting Materials for Solar Photocatalysis

Rathore, Dhirendra Singh; Jadoun, Sapana

doi:10.1201/9781003188582-2

Cited by 2 publications

(2 citation statements)

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“…The refractive index changes during this propagation, turning into a complicated quantity. As previously addressed, the refractive index, the real component of this complex variable, and the extinction coefficient, abbreviated k, are the imaginary components 26 . The extinction coefficient can be calculated using the following expression:

k = \frac{italicαλ}{4 π},

where α represents the absorption coefficient of the material, λ is the wavelength of radiation incident on the material.…”

Section: Resultsmentioning

confidence: 99%

Novel approach to enhance the optical and electrical properties of polymer electrolytes using phenol red dye

Koliyoor,

Ismayil,

Ammathnad Babashankar

et al. 2023

Polymer Engineering & Sci

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This article comprehensively analyzes how phenol red dye affects the optical, structural, and electrical properties of sodium bromide‐doped polymer electrolyte films based on sodium carboxymethyl cellulose. Conventional solution casting technique has been employed to prepare the electrolytes. The optical analysis reveals that incorporating the phenol red dye improves the optical properties. Fourier transform infrared spectroscopy is used to study the kind of complexation between the polymer and dopants. Scanning electron microscope micrographs of the electrolytes indicate the acquisition of free volume on the surface of the polymer matrix. The electrical properties are studied using impedance analyzer, which shows that the ionic conductivity increases when the dye is incorporated. The electrolyte system incorporated with 0.25 wt% of the dye exhibits the highest conductivity among the other systems. Photoluminescence investigation demonstrates that doping increases the intensity of the photoluminescence emission as it minimizes the free volume size. Commission Internationale de l'Eclairage (CIE) chromatograph studies indicate that the doped samples emit a yellow color with a color purity of 97%. All in all, the findings imply that adding dye to the polymer matrix increases the electrical and visual characteristics of the polymer electrolyte.Highlights Phenol red dye improves the optical properties of sodium carboxymethyl cellulose‐based polymer electrolytes. Scanning electron microscope micrographs reveal the creation of free volume on the surface of electrolyte films. Analysis of electrical properties shows a slight increase in ionic conductivity with dye incorporation. Photoluminescence intensity increases with dye due to reduced free volume size. Doped samples emit 97% purity yellow enhancing electrical and optical properties.

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k = \frac{italicαλ}{4 π},

where α represents the absorption coefficient of the material, λ is the wavelength of radiation incident on the material.…”

Section: Resultsmentioning

confidence: 99%

Novel approach to enhance the optical and electrical properties of polymer electrolytes using phenol red dye

Koliyoor,

Ismayil,

Ammathnad Babashankar

et al. 2023

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…On the other hand, such a high control on the spatial position of the site-controlled QDs comes at the cost of a spread in the QD emission energy, which is somewhat higher than the best results obtained by self-assembled QDs (∼20 meV [64][65][66][67]) or site-controlled QDs (∼15 meV [68], with a record-low inhomogeneous broadening of 1 meV [69]).…”

Section: Site-controlled Quantum Emitter Fabricationmentioning

confidence: 86%

Tailoring the optical properties of dilute nitride semiconductors at the nanometer scale

Pettinari¹,

Marotta²,

Biccari³

et al. 2021

Nanotechnology

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We report on the innovative approaches we developed for the fabrication of site-controlled semiconductor nanostructures [e.g. quantum dots (QDs), nanowires], based on the spatially selective incorporation and/or removal of hydrogen in dilute nitride semiconductor alloys [e.g. Ga(AsN) and (InGa)(AsN)]. In such systems, the formation of stable nitrogen-hydrogen complexes removes the effects nitrogen has on the alloy properties, which in turn paves the way to the direct engineering of the material’s electronic—and, thus, optical—properties: not only the bandgap energy, but also the refractive index and the polarization properties of the system can indeed be tailored with high precision and in a reversible manner. Here, lithographic approaches and/or plasmon-assisted optical irradiation—coupled to the ultra-sharp diffusion profile of hydrogen in dilute nitrides—are employed to control the hydrogen implantation and/or removal process at a nanometer scale. This results in a highly deterministic control of the spatial and spectral properties of the fabricated nanostructures, eventually obtaining semiconductor nanowires with controlled polarization properties, as well as site-controlled QDs with an extremely high control on their spatial and spectral properties. The nanostructures fabricated with these techniques, whose optical properties have also been simulated by finite-element-method calculations, are naturally suited for a deterministic coupling in optical nanocavities (i.e. photonic crystal cavities and circular Bragg resonators) and are therefore of potential interest for emerging quantum technologies.

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Optical Properties of Semiconducting Materials for Solar Photocatalysis

Cited by 2 publications

References 0 publications

Novel approach to enhance the optical and electrical properties of polymer electrolytes using phenol red dye

Novel approach to enhance the optical and electrical properties of polymer electrolytes using phenol red dye

Tailoring the optical properties of dilute nitride semiconductors at the nanometer scale

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