absorption of light
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2022 ◽  
Vol 5 (2) ◽  
Author(s):  
E.M. Keita ◽  
B. Mbow ◽  
C. Sene

The inorganic and hybrid organic / inorganic perovskites based on lead halide and derived materials (alloys) having the formula ABX3 are emerging as a new and innovative family of absorber materials for the conversion of solar energy into electricity in photovoltaic systems. Thanks to their composition, perovskites and derivatives have exceptional optical, electrical and structural properties with high absorption of light in the visible solar spectrum and good mobility of charge carriers generated by photons facilitating the extraction of electric current. Due to these important properties, perovskite solar cells combine a high efficiency of conversion of light into electricity with great ease of preparation and synthesis at very low costs via simple deposition techniques. In this article we review the structural and optoelectronic properties of perovskites 3D exhibiting photovoltaic properties, we are also interested in the operating principle of perovskite-based solar cells, charge transport materials and associated architectures. Simple fabrication techniques and issues with stability and hysteresis are also discussed.


Author(s):  
В.Р. Расулов ◽  
Р.Я. Расулов ◽  
Б.Б. Ахмедов ◽  
И.А. Муминов

Interband two-photon optical transitions are classified and expressions are obtained for the matrix elements in a narrow-gap semiconductor depending on the band parameters, degree of polarization, and light frequency. It is shown that the main contribution to two-photon linear-circular dichroism in narrow-gap semiconductors is made by optical transitions proceeding from the subband of light holes to the conduction band. The dependences of the partial coefficients of interband two-photon absorption of light, which differ from each other by the types of optical transitions, are analyzed depending on the degree of polarization of the light, and a quantitative analysis of the coefficient of linear-circular dichroism of two-photon absorption of light is carried out. Expressions are obtained for the spectral dependence of the coefficient of interband two-photon absorption of light in narrow-gap semiconductors in the Kane model.


2022 ◽  
Vol 92 (2) ◽  
pp. 291
Author(s):  
С.Д. Ханин ◽  
А.И. Ванин ◽  
Ю.А. Кумзеров ◽  
В.Г. Соловьев ◽  
А.В. Цветков ◽  
...  

The possibilities of practical implementation of physical approaches to the design of metal-dielectric photonic crystal systems based on opals, which allow controlling the propagation of electromagnetic waves, are shown. The implemented approaches are based on the effects of excitation of surface plasmon-polaritons capable of propagating along the metal-dielectric interface in plasmonic-photonic layered heterostructures, and modification of the photonic-energy structure of the nanocomposite as a result of dispersion of silver in the opal matrix. Experimental results are presented indicating the occurrence of extraordinary transmission and absorption of light in plasmonic-photonic heterostructures, as well as the asymmetric shape of curves in the reflection spectra of nanocomposites, which is associated with the Fano resonance.


Author(s):  
S. D. Khanin ◽  
A. I. Vanin ◽  
Yu. A. Kumzerov ◽  
V. G. Solovyev ◽  
A. V. Cvetkov ◽  
...  

The article studies the propagation of electromagnetic waves in metal-dielectric systems based on opals. We revealed anomalous transmission and absorption of light by hybrid plasmon- photonic layered heterostructures associated with the excitation of surface plasmon polaritons propagating along the metal-dielectric interface. The position of maxima in the reflection spectra of nanocomposites, obtained by filling the opal matrix with metal by the electrothermodiffusion method, is explained by the Bragg diffraction, and the asymmetric form of the spectral curves is attributed to the Fano resonance.


Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1500
Author(s):  
Sanjay Gopal Ullattil ◽  
Janez Zavašnik ◽  
Ksenija Maver ◽  
Matjaž Finšgar ◽  
Nataša Novak Tušar ◽  
...  

The novelty of this work was to prepare a series of defect-rich colored TiO2 nanostructures, using a peroxo solvothermal-assisted, high-pressure nitrogenation method. Among these solids, certain TiO2 materials possessed a trace quantity of anatase–rutile heterojunctions, which are beneficial in obtaining high reaction rates in photocatalytic reactions. In addition, high surface area (above 100 m2/g), even when utilizing a high calcination temperature (500 °C), and absorption of light at higher wavelengths, due to the grey color of the synthesized titania, were observed as an added advantage for photocatalytic hydroxyl radical formation. In this work, we adopted a photoluminescent probe method to monitor the temporal evolution of hydroxyl radicals. As a result, promising hydroxyl radical formations were observed for all the colored samples synthesized at 400 and 500 °C, irrespective of the duration of calcination.


2021 ◽  
Vol 105 (1) ◽  
pp. 441-452
Author(s):  
Katharina Mairhofer ◽  
Bettina Kipper-Pires ◽  
Gerhard Leitner ◽  
Guenter Fafilek

Well-defined cuprous oxide (Cu2O) thin films can be electrodeposited from an electrolyte containing copper (II) sulfate, lactic acid and sodium hydroxide. As Cu2O is a p-type semiconductor, it is possible to accelerate the process through illumination with light of sufficient energy (>2.1eV). Cyclic voltammetry and transient potentiostatic measurements were performed in a three-electrode setup with copper metalized wafers as a working electrode. Illumination was performed through the electrolyte, therefore absorption of light by the electrolyte had to be taken into consideration. Potentiostatic measurements with a blue LED as a light source have shown an tenfold increase in layer thickness in comparison to depositions without additional illumination. The deposited films were investigated with SEM analysis.


Author(s):  
Voxob Rustamovich Rasulov ◽  
Rustam Yavkachovich Rasulov ◽  
Iqboljon Mamirjonovich Eshboltaev ◽  
Mavzurjon Xursandboyevich Qo’chqorov

The spectral dependences of the coefficients of interband three-photon optical transitions for InSb and for some optical transitions are calculated and a numerical analysis of the coefficient of interband three-photon absorption of light is carried out, which taken into account the contribution to the three-photon absorption of optical transitions occurring during the simultaneous absorption of two photons in the Kane model. Interband three-photon optical transitions in crystals of the InSb and type are classified, and the spectral dependence of some optical transitions is analyzed. The coefficient of linear-circular dichroism of interband three-photon absorption in a crystal in the Kane model is calculated. KEY WORDS: interband three-photon optical transitions, spectral dependence, crystal.


2021 ◽  
Author(s):  
Mathieu Hautefeuille ◽  
Juan Hernández-Cordero
Keyword(s):  

2021 ◽  
Vol 2103 (1) ◽  
pp. 012151
Author(s):  
N N Rosanov ◽  
N A Veretenov ◽  
S V Fedorov

Abstract We investigate, analytically and numerically, tubular topological laser solitons, which serve as intermediate link between 2D- and 3D-dissipative optical solitons in media with nonlinear amplification and absorption of light or in large-size laser with such a medium. Features of both 3D-dark solitons (with nonvanishing intensity at periphery for all spatial dimensions) and bright-dark solitons (vanishing in two of three dimensions) are studied, including their stability.


2021 ◽  
Vol 3 (5) ◽  
pp. 51-57
Author(s):  
V. R. Rasulov ◽  
R. Ya. Rasulov ◽  
I. M. Eshboltaev ◽  
M. X. Qo’chqorov

The spectral dependences of the coefficients of interband three-photon optical transitions for InSb and for some optical transitions are calculated and a numerical analysis of the coefficient of interband three-photon absorption of light is carried out, which taken into account the contribution to the three-photon absorption of optical transitions occurring during the simultaneous absorption of two photons in the Kane model. Interband three-photon optical transitions in crystals of the InSb and type are classified, and the spectral dependence of some optical transitions is analyzed. The coefficient of linear-circular dichroism of interband three-photon absorption in a crystal in the Kane model is calculated.


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