scholarly journals Enhanced optical properties of perovskite thin film through material optimization for photovoltaic application

2021 ◽  
Vol 239 ◽  
pp. 00020
Author(s):  
SA Olaleru ◽  
JK Kirui ◽  
D Wamwangi ◽  
L Jhamba ◽  
R Erasmus ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Optical Properties ◽  
Near Infrared ◽  
Photovoltaic Cell ◽  
Material Composition ◽  
Infrared Range ◽  
Optical Parameters ◽  
Material Optimization ◽  
New Material ◽  
Suitable Property

The optical performance of the perovskite materials is enhanced through material optimization. This work seeks to establish the role of antisolvent and additive with new material composition on light absorption property. Due to this composition we extended the wavelengths to near Infrared range which is a suitable property for photovoltaic device. From the features of the film, optical parameters, together with anti-stoke shift and dielectric constant were calculated using Cauchy dispersion formalism. Based on our results, dielectric constant which is considered as a design parameter for photovoltaic cell and an unusual anti-stoke shift were observed. In sum, the optical properties are tied to material composition, morphology and technique used.

Effect of non-annealed and annealed ZnO on the optical properties of PVC/ZnO nanocomposite films

2021 ◽  
pp. 089270572110386
Author(s):  
Ali F Al-Shawabkeh ◽  
Ziad M Elimat ◽  
Khaleel N Abushgair
Keyword(s):  
Dielectric Constant ◽  
Refractive Index ◽  
Optical Properties ◽  
Zno Nanoparticles ◽  
Oscillator Strengths ◽  
Nanocomposite Films ◽  
Optical Parameters ◽  
Zno Nanoparticle ◽  
Dispersion Energy ◽  
Optical Susceptibility

The goal of this study was to investigate the optical properties of the prepared polyvinyl chloride (PVC)/zinc oxide (ZnO) nanocomposite films. The PVC/ZnO nanocomposite films consist of the addition of different concentrations with both non-annealed ZnO nanoparticles and ZnO nanoparticles annealed at temperature of 700°C. The PVC/ZnO nanocomposite films by weight concentrations of (0 wt.%, 2.5 wt.%, 5 wt.% and 10 wt.%) have been prepared by the casting method. The optical absorbance and transmittance values of the composites films were measured in the wavelength range between (250 to 1100 nm) at room temperature by using the UV-1800 Shimadzu spectrophotometer. The optical properties (absorption coefficient, dielectric constant, refractive index, and optical conductivity) have been investigated by the ultraviolet (UV) spectrophotometer. The optical parameters (direct optical energy gap, excitation energy for electronic transitions, the dispersion energy, static refractive index, static dielectric constant, optical oscillator strengths, the moments of optical spectrum, linear optical susceptibility, third-order nonlinear optical susceptibility, nonlinear refractive index, high-frequency dielectric constant, the carrier concentration to the effective mass ratio, the long wavelength refractive index and the plasma frequency) were calculated. The results showed that the optical properties behavior of the PVC/ZnO nanocomposite films was found to be dependent on the ZnO concentration, and photon wavelength. In addition, the results of the study show that the optical parameters can be influenced by alter the concentration of the nonannealed and annealed a ZnO nanoparticle in the PVC polymer matrix.

scholarly journals Multi-layered tissue head phantoms for noninvasive optical diagnostics

2015 ◽  
Vol 08 (03) ◽  
pp. 1541005 ◽  
Author(s):  
M. S. Wróbel ◽  
A. P. Popov ◽  
A. V. Bykov ◽  
M. Kinnunen ◽  
M. Jędrzejewska-Szczerska ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Optical Measurement ◽  
Human Head ◽  
Medical Diagnostics ◽  
Optical Parameters ◽  
Measurement Systems ◽  
Tissue Phantoms ◽  
Optical And Mechanical Properties

Extensive research in the area of optical sensing for medical diagnostics requires development of tissue phantoms with optical properties similar to those of living human tissues. Development and improvement of in vivo optical measurement systems requires the use of stable tissue phantoms with known characteristics, which are mainly used for calibration of such systems and testing their performance over time. Optical and mechanical properties of phantoms depend on their purpose. Nevertheless, they must accurately simulate specific tissues they are supposed to mimic. Many tissues and organs including head possess a multi-layered structure, with specific optical properties of each layer. However, such a structure is not always addressed in the present-day phantoms. In this paper, we focus on the development of a plain-parallel multi-layered phantom with optical properties (reduced scattering coefficient [Formula: see text] and absorption coefficient μa) corresponding to the human head layers, such as skin, skull, and gray and white matter of the brain tissue. The phantom is intended for use in noninvasive diffuse near-infrared spectroscopy (NIRS) of human brain. Optical parameters of the fabricated phantoms are reconstructed using spectrophotometry and inverse adding-doubling calculation method. The results show that polyvinyl chloride-plastisol (PVCP) and zinc oxide ( ZnO ) nanoparticles are suitable materials for fabrication of tissue mimicking phantoms with controlled scattering properties. Good matching was found between optical properties of phantoms and the corresponding values found in the literature.

scholarly journals Empirical Relation for Electronic and Optical Properties of Binary Tetrahedral Semiconductors

2021 ◽  
Keyword(s):  
Dielectric Constant ◽  
Optical Properties ◽  
Atomic Number ◽  
Energy Gap ◽  
Empirical Relation ◽  
Average Energy ◽  
Optical Parameters ◽  
Dielectric Analysis ◽  
Average Atomic Number ◽  
Tetrahedral Semiconductors

The concept of ionicity has been developed by Phillips and Van Vechten from the dielectric analysis of the semiconductors and insulators to evaluate various bond parameters of binary tetrahedral (AIIBVI and AIIIBV) semiconductors. In this paper, an advance hypothesis of average atomic number of the elements in a compound has been used to evaluate intrinsic electronic and optical parameters such as ionic gap (Ec), average energy gap (Eg), crystal ionicity (fi) and dielectric constant (ϵ) of binary tetrahedral semiconductors.

scholarly journals Photometric Observations of Aerosol Optical Properties and Emission Flux Rates of Stromboli Volcano Plume during the PEACETIME Campaign

2021 ◽  
Vol 13 (19) ◽  
pp. 4016
Author(s):  
Pasquale Sellitto ◽  
Giuseppe Salerno ◽  
Jean-François Doussin ◽  
Sylvain Triquet ◽  
François Dulac ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Visible Range ◽  
Infrared Range ◽  
Emission Flux ◽  
Stromboli Volcano ◽  
Aerosol Emission ◽  
Photometric Observations ◽  
Sulphate Aerosols ◽  
Aerosol Emissions

The characterisation of aerosol emissions from volcanoes is a crucial step towards the assessment of their importance for regional air quality and regional-to-global climate. In this paper we present, for the first time, the characterisation of aerosol emissions of the Stromboli volcano, in terms of their optical properties and emission flux rates, carried out during the PEACETIME oceanographic campaign. Using sun-photometric observations realised during a near-ideal full plume crossing, a plume-isolated aerosol optical depth of 0.07–0.08 in the shorter-wavelength visible range, decreasing to about 0.02 in the near infrared range, was found. An Ångström exponent of 1.40 ± 0.40 was also derived. This value may suggest the dominant presence of sulphate aerosols with a minor presence of ash. During the crossing, two separate plume sections were identified, one possibly slightly affected by ash coming from a mild explosion, and the other more likely composed of pure sulphate aerosols. Exploiting the full crossing scan of the plume, an aerosol emission flux rate of 9–13 kg/s was estimated. This value was 50% larger than for typical passively degassing volcanoes, thus pointing to the importance of mild explosions for aerosol emissions in the atmosphere.

Changes in Optical Properties of in vitro Myocardium Tissue Due to Heating in the Visible and Near-Infrared Range

2008 ◽  
Vol 35 (5) ◽  
pp. 792-796 ◽  
Author(s):  
敖荟兰 Ao Huilan ◽  
邢达 Xing Da ◽  
魏华江 Wei Huajiang ◽  
巫国勇 Wu Guoyong ◽  
鲁建军 Lu Jianjun
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Infrared Range ◽  
Near Infrared Range

Optical properties of a polyimide-fullerene system in the near infrared range (λ=1047 nm)

2003 ◽  
Vol 29 (8) ◽  
pp. 672-675 ◽  
Author(s):  
N. V. Kamanina ◽  
M. O. Iskandarov ◽  
A. A. Nikitichev
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Infrared Range ◽  
Near Infrared Range

Optical properties of bread in the near-infrared range

1988 ◽  
Vol 8 (2) ◽  
pp. 129-139 ◽  
Author(s):  
Christina Skjöldebrand ◽  
Christina Ellbjär ◽  
Claes Göran Andersson ◽  
Tord S. Eriksson
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Infrared Range ◽  
Near Infrared Range

Optical properties of oakwood in the near-infrared range of semi-transparency

2018 ◽  
Vol 57 (23) ◽  
pp. 6657 ◽  
Author(s):  
Leonid Dombrovsky ◽  
Jean-François Henry ◽  
Clarisse Lorreyte ◽  
Hervé Pron ◽  
Jaona Randrianalisoa
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Infrared Range ◽  
Near Infrared Range

Modeling of the Structure of Heat-Insulating Semi-Transparent Materials and Coatings for Industrial and Transport Power Plants

2018 ◽  
Vol 284 ◽  
pp. 1215-1220
Author(s):  
V.G. Merzlikin ◽  
T.V. Zhubreva ◽  
A.V. Kostukov
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Power Plants ◽  
Near Infrared ◽  
Structural Parameters ◽  
Internal Surface ◽  
Infrared Range ◽  
Optical Parameters ◽  
Conductive Heat ◽  
Periodic Regime

The influence of optical characteristics of semitransparent thermal barrier coatings (TBC) on thermal regulation of heat-stressed elements of power plants is studied. There was used the developed by the authors methodology of physical and mathematical simulation of thermoradiational (in the range 1-2 μm) and conductive heat transmission in ceramic thermal insulation of chamber combustion inner walls of a diesel engine. The paper discusses temporal temperature regimes in model two-layer TBC-coatings in the form of a selectively scattering and absorbing (in the near infrared range) ceramic heat-insulating layer, deposited on the bonding sublayer (with boundary reflection) of the internal surface of the combustion chamber of Low Heat Rejection diesel. Spectrophotometric measurements of the optical parameters have ensured estimates of optical and thermal fields of the investigated ceramics, the structural composition of which was determined on the basis of ZrO2+8%Y2O3. For typical values of radiant-convective flux up to 1-2 MW/m2 (effecting on heat-stressed elements of heat-insulated combustion chamber of a diesel engine in pulse-periodic regime) optical and structural parameters TBC-coatings that ensure control and superintendence of the ceramic layer surface temperature and its temperature gradient were proposed.

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