Temat: współczynnik załamania - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Determination of different optical properties for cubic titanium dioxide: an AB-INITIO approach
Autorzy:: Dash, Debashish
Pandey, Chandan K.
Chaudhury, Saurabh
Tripathy, Susanta K.
Powiązania:: https://bibliotekanauki.pl/articles/102957.pdf
Data publikacji:: 2018
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: DFT
cubic TiO2
refractive index
absorption coefficient
reflectivity
TiO2
współczynnik załamania światła
współczynnik absorpcji
współczynnik odbicia
Opis:: This paper presents an analysis of optical properties of cubic titanium dioxide (TiO2) using Orthogonalized Linear Combinations of Atomic Orbitals (OLCAO) basis set under the framework of Density Functional Theory (DFT). Many optical properties such as refractive index, extinction coefficient, reflectivity, absorption coefficient, photoconductivity, and loss coefficient have been studied and analyzed thoroughly. From the analysis of optical properties, it is seen that, cubic TiO2 supports interband transition between states. Reflectivity of pyrite structure TiO2 lies within IRvisible – UV region due to which it qualifies for coating industry. Furthermore, the results are compared with previous theoretical as well as with experimental results. It is found that DFT based simulation produces results which are close approximation to experimental results.
Źródło:: Advances in Science and Technology. Research Journal; 2018, 12, 3; 223-232
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Właściwości kryształów fotonicznych umożliwiające ich wykorzystanie w poligrafii
Properties of photonic crystals that enable their use in polygraphy
Autorzy:: Zwierzchaczewska, M.
Podsiadło, H.
Powiązania:: https://bibliotekanauki.pl/articles/128508.pdf
Data publikacji:: 2018
Wydawca:: Centralny Ośrodek Badawczo-Rozwojowy Przemysłu Poligraficznego
Tematy:: kryształ fotoniczny
fotoniczna przerwa wzbroniona
współczynnik załamania światła
zabezpieczenie dokumentów
photonic crystal
photonic band gap
refractive index
securing documents
Opis:: Photonic crystals are an innovative material and have recently been used in printing. They consist of dielectric layers of a variable refractive index. The change of this value may occur in one, two or three directions. Thanks to it, photonic crystals give the possibility of conscious control of the electromagnetic wave in the structure, which leads to the creation of photonic band gap, and this allows the conscious creation of color. It turns out therefore that the color is created not only as a result of the mixture of additive or subtractive basic colors, but also due to photonic changes as in the case of photonic crystals. Photonic crystals are used in printing as a method of securing documents. The deliberately designed width of the photonic band gap creates any color that can change under the influence of certain factors, such as the application of a magnetic field or a change in the angle of observation. Pigments containing photonic crystals make the item difficult to forge. So far, research has been conducted on the use of cognition of new properties of these crystals and on the use of those already known. Conducting experiments is expensive, however, the premonition of scientists allow to conclude that photonic crystals are a valuable material on which to focus more attention.
Źródło:: Acta Poligraphica; 2018, 12; 71-81
2299-9981
Pojawia się w:: Acta Poligraphica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Pulsed laser deposition of ZnO and MoO3 as reflection prohibitors on photovoltaic cell substrate to enhance the efficiency
Autorzy:: Selvan, P.
Jebaraj, D. J. J.
Hynes, N. R. J.
Powiązania:: https://bibliotekanauki.pl/articles/2201045.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: solar cell
antireflection coating
refractive index
pulsed laser deposition
ogniwo słoneczne
powłoka antyrefleksyjna
współczynnik załamania światła
pulsacyjna ablacja laserowa
Opis:: Purpose With the ever-growing demand for conventional fuels, the improvement in the efficiency of the photovoltaic system is the need of the hour. Antireflection coatings enhance the availability of solar power by reducing the percentage of light reflected. A new coating has been developed to improve the solar cell's overall efficiency. This study focuses on enhancing the efficiency of the monocrystalline solar cell when a coating of ZnO-MoO3 is applied at a certain thickness. Design/methodology/approach A layer of ZnO followed by MoO3 is deposited on a Silicon solar cell substrate using a Pulsed Laser Deposition process. Due to the transmissivity d between the two materials, they act as excellent antireflection coating. The layer thickness has been engineered to lie in the maximum absorption spectrum of monocrystalline silicon solar cells, which is between 400 and 800 nanometers. Findings Based on the calculation of transmissivities for a given layer thickness of coating material, the coating has been done, and the efficiencies of the coated specimen were compared with the uncoated solar cell. The percentage improvement in the electrical efficiency of a single crystalline silicon solar cell with an anti-reflection coating at 1059 W/m2 is about 35.7%. Research limitations/implications Among the available antireflection coating materials, the combination that provides better efficiency when coated on top of a solar cell is hard to find. Practical implications This anti-reflection coating could be a better solution to enhance the overall efficiency of the single crystalline silicon solar cell. Originality/value Although ZnO and MoO3 coatings have been investigated separately for improvement in solar cell efficiency with varying levels of success, the hybrid coating of ZnO/MoO3 with a performance enhancement of 35.7% is a great leap.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2022, 113, 2; 65--71
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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