scholarly journals Photoinduced Operation by Absorption of the Chalcogenide Nanocrystallite Containing Solar Cells

2016 ◽  
Vol 61 (4) ◽  
pp. 1953-1956 ◽  
Author(s):  
A.M. Elnaggar ◽  
A. Albassam ◽  
K. Oźga ◽  
J. Jędryka ◽  
M. Szota ◽  
...  
Keyword(s):  
Solar Cells ◽  
Laser Beam ◽  
Laser Treatment ◽  
Laser Light ◽  
Glass Laser ◽  
Photovoltaic Efficiency ◽  
Chalcogenide Materials ◽  
Nanoparticle Sizes

Abstract It is shown that for the solar cells containing chalcogenide nanocrystallites using external laser light, one can achieve some enhancement of the photovoltaic efficiency. Photoinduced treatment was carried out using two beams of splitted Er: glass laser operating at 1.54 μm. The light of the laser was incident at different angles and the angles between the beams also were varied. Also, the studies of nanocomposite effective structures have shown enhancement of effective nanocrystalline sizes during the laser treatment. Nanocrystallites of CuInS2 and CuZnSnS4 (CZTS) were used as chalcogenide materials. The optimization of the laser beam intensities and nanoparticle sizes were explored.

scholarly journals The use of laser biostimulation in human and animal physiotherapy – a review

2017 ◽  
Vol 86 (1) ◽  
pp. 91-96 ◽  
Author(s):  
Paulina Zielińska ◽  
Maria Soroko ◽  
Anna Zwyrzykowska ◽  
Zdzisław Kiełbowicz
Keyword(s):  
Veterinary Medicine ◽  
Laser Beam ◽  
Laser Treatment ◽  
Laser Therapy ◽  
Laser Light ◽  
Regenerative Processes ◽  
Physical Methods ◽  
Animal Organism ◽  
Positive Effect ◽  
Class Iv

Laser biostimulation involves applying a laser beam to the tissue to facilitate healing and regenerative processes. Laser therapy is one of the most important physical methods used in human physiotherapy. In veterinary medicine, laser therapy is a new and so far poorly examined method. The results of studies conducted so far are very promising, yet the positive effect of laser light, especially that of class IV, has yet to be confirmed. This article presents an overview of the available literature on the effect of laser treatment on the human and animal organism.

scholarly journals Influence of the Active Layer Structure on the Photovoltaic Performance of Water-Soluble Polythiophene-Based Solar Cells

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1640
Author(s):  
Massimiliano Lanzi ◽  
Debora Quadretti ◽  
Martina Marinelli ◽  
Yasamin Ziai ◽  
Elisabetta Salatelli ◽  
...  
Keyword(s):  
Solar Cells ◽  
Layer Structure ◽  
Photovoltaic Performance ◽  
Phase Segregation ◽  
Water Soluble ◽  
Polymerization Reaction ◽  
Fullerene Derivative ◽  
C60 Fullerene ◽  
Photovoltaic Efficiency ◽  
Single Material

A new side-chain C60-fullerene functionalized thiophene copolymer bearing tributylphosphine-substituted hexylic lateral groups was successfully synthesized by means of a fast and effective post-polymerization reaction on a regioregular ω-alkylbrominated polymeric precursor. The growth of the polymeric intermediate was followed by NMR spectrometry in order to determine the most convenient reaction time. The obtained copolymer was soluble in water and polar solvents and was used as a photoactive layer in single-material organic photovoltaic (OPV) solar cells. The copolymer photovoltaic efficiency was compared with that of an OPV cell containing a water-soluble polythiophenic homopolymer, functionalized with the same tributylphosphine-substituted hexylic side chains, in a blend with a water-soluble C60-fullerene derivative. The use of a water-soluble double-cable copolymer made it possible to enhance the control on the nanomorphology of the active blend, thus reducing phase-segregation phenomena, as well as the macroscale separation between the electron acceptor and donor components. Indeed, the power conversion efficiency of OPV cells based on a single material was higher than that obtained with the classical architecture, involving the presence of two distinct ED and EA materials (PCE: 3.11% vs. 2.29%, respectively). Moreover, the synthetic procedure adopted to obtain single material-based cells is more straightforward and easier than that used for the preparation of the homopolymer-based BHJ solar cell, thus making it possible to completely avoid the long synthetic pathway which is required to prepare water-soluble fullerene derivatives.

Local Laser Treatment of Tribological Plasma Sprayed Coatings

1998 ◽  
Author(s):  
T. Otmianowski ◽  
B. Antoszewski ◽  
W. Zorawski
Keyword(s):  
Laser Beam ◽  
Laser Treatment ◽  
Coating Layer ◽  
Tribological Test ◽  
Test Pieces ◽  
Steel Base ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Abstract In the article the results of set of experiments concerning the changes in microstructure of plasma sprayed Al2O3, Cr2O3 and W2C coatings of tribological test pieces obtained with use of locally applied laser beam treatment are given and discussed. The improvement of sprayed on coating layer adhesion to the steel base was ascertained and evaluated. The possibilities of the application of the described technology for development and production of slide elements of tribological joints are noticed.

scholarly journals Crystalline poly(triazine imide) based g-CN as an efficient electrocatalyst for counter electrodes of dye-sensitized solar cells using a triiodide/iodide redox electrolyte

2015 ◽  
Vol 3 (48) ◽  
pp. 24232-24236 ◽  
Author(s):  
Woo-ram Lee ◽  
Young-Si Jun ◽  
Jihee Park ◽  
Galen D. Stucky
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Pt Catalyst ◽  
Counter Electrodes ◽  
Dye Sensitized ◽  
Photovoltaic Efficiency ◽  
Redox Electrolyte ◽  
Sensitized Solar Cells

DSSCs using g-CN as an electrocatalyst exhibit photovoltaic efficiency comparable to that of conventional Pt catalyst.

scholarly journals Photovoltaic efficiency enhancement of polycrystalline silicon solar cells by a highly stable luminescent film

2020 ◽  
Vol 63 (4) ◽  
pp. 544-551 ◽  
Author(s):  
Yuan Wang ◽  
Paula Gawryszewska-Wilczynsk ◽  
Xiurong Zhang ◽  
Jian Yin ◽  
Yongqing Wen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Polycrystalline Silicon ◽  
Silicon Solar Cells ◽  
Efficiency Enhancement ◽  
Photovoltaic Efficiency

scholarly journals The influence of laser re-melting on microstructure and hardness of gas-nitrided steel

2016 ◽  
Vol 36 (1) ◽  
pp. 18-22 ◽  
Author(s):  
Dominika Panfil ◽  
Piotr Wach ◽  
Michał Kulka ◽  
Jerzy Michalski
Keyword(s):  
Laser Beam ◽  
Laser Treatment ◽  
Diffusion Zone ◽  
Nitrided Layer ◽  
Nitriding Process ◽  
Beam Power ◽  
Gas Nitriding ◽  
Nitrided Steel ◽  
Laser Beam Power ◽  
And Diffusion

Abstract In this paper, modification of nitrided layer by laser re-melting was presented. The nitriding process has many advantageous properties. Controlled gas nitriding was carried out on 42CrMo4 steel. As a consequence of this process, ε+γ’ compound zone and diffusion zone were produced at the surface. Next, the nitrided layer was laser remelted using TRUMPF TLF 2600 Turbo CO2 laser. Laser tracks were arranged as single tracks with the use of various laser beam powers (P), ranging from 0.39 to 1.04 kW. The effects of laser beam power on the microstructure, dimensions of laser tracks and hardness profiles were analyzed. Laser treatment caused the decomposition of continuous compound zone at the surface and an increase in hardness of previously nitrided layer because of the appearance of martensite in re-melted and heat-affected zones

scholarly journals Study of second harmonic emissions for characterization of laser–plasma X-ray sources

1998 ◽  
Vol 16 (2) ◽  
pp. 397-404 ◽  
Author(s):  
A. Giulietti ◽  
C. Beneduce ◽  
T. Ceccotti ◽  
D. Giulietti ◽  
L.A. Gizzi ◽  
...  
Keyword(s):  
Laser Beam ◽  
Transport Process ◽  
Energy Transport ◽  
Laser Light ◽  
Second Harmonic ◽  
Target Position ◽  
Laser Pulses ◽  
Strongly Correlated ◽  
X Ray

An investigation of second harmonic (SH) and X-ray emissions from Al plasmas produced by 3-ns, 1.064-μm laser pulses at 1014 W/cm2 is reported. The SH and X-ray yields are strongly correlated as a function of the target position with respect to the laser beam focus. The SH originates from the underdense coronal plasma and has a filamentary source, while the X-ray source is uniform. The results suggest that, although the X-ray emission is significantly enhanced by the filamentation of the laser light in the corona, there is a smoothing effect in the energy transport process toward the overdense region.

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