Wyniki wyszukiwania - Biblioteka Nauki

1

Antireflection coating with plasmonic metal nanoparticles for photovoltaic applications

100%

Starowicz Z. , Lipiński M.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

105-106

EN

The paper contains: broad introduction to the topic of plasmonics for photovoltaic application, the purpose of research was given as well as the description of one of alternative methods of nanoparticle deposition, addition of plasmonic metal nanospheres resulted in photocurrent and efficiency enhancement, using of relatively smaller spheres of 70nm diameter and mixtures of two metals is novel approach. This opens up new are of research of the best metal mixture. Farther studies have to be done to explain explicitly other features like optimal size and apart between nanoparticles.

2

Photocatalytic degradation of the organic compounds enhanced by chemical oxidants

100%

Dziedzic J. , Nowak P. , Warszyński P. , Haber J.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

115-117

EN

We demonstrated that more than 50% of humic acid may be removed from the solution simply by its adsorption on the titania surface if the concentration of TiO₂ in suspension is high enough. 100% removal of HA can be achieved even at relatively low dosage of TiO₂ (100 mg I−¹) if UV illumination of the suspension is applied for sufficiently long time (at least 3 hours). Addition of oxidant to the solution containing titania suspension and dissolved humic acid greatly enhances the activity of TiO₂ in the process of decomposition of organic substances. We showed that more than 90% conversion of HA can be obtained when sodium persulphate was applied as chemical oxidant already after one hour. Therefore, the synergistic effect was observed when TiO₂ and Na₂S₂O₈ were used simultaneously for the removal of humic substances. The photodecomposition efficiency of in the UV/TiO₂/Na₂S₂O₈ system was greater than of one with H₂ O₂ used as oxidant. Moreover, contrary to hydrogen peroxide, sodium persulphate is rather stable in room temperature. Therefore, use of Na₂S₂O₈ as oxidant supporting photocatalytic removal of humic substances from potable water should be preferred.

3

Floating Photovoltaics: Assessing the Potential, Advantages, and Challenges of Harnessing Solar Energy on Water Bodies

80%

Amer A. , Attar H. , As'ad S. , Alsaqoor S. , Colak I. , Alahmer A. , Alali M. , Borowski G. , Hmada M. , Solyman A.

Journal of Ecological Engineering

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2023

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tom Vol. 24, nr 10

324--339

EN

The worldwide transition to a future with net-zero emissions depends heavily on solar energy. However, when land prices rise, and population density rises, the need for large land expanses to develop solar farms poses difficulties. Floating Photovoltaics (FPV) has come to light as a viable remedy to this problem. FPV, which includes mounting solar panels on bodies of water, is gaining popularity as a practical choice in many nations worldwide. A significant capacity of 404 GWp for producing clean energy might be attained by using FPV to cover only 1% of the world’s reservoirs. This review shows that FPV has several benefits over conventional ground-mounted PV systems. On the other hand, there is a large study void regarding the effects of FPV on water quality and aquatic ecosystems. This review looks at the most recent FPV research, including its advantages, disadvantages, and potential. It looks into the compatibility of various bodies of water, worldwide potential, system effectiveness, and the possibility of integrating different technologies with FPV.

4

Storage systems for solar energy suitable for agriculture. Part two: electrical energy

80%

Kapica J.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

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2017

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tom Vol. 6, No 4

63--69

EN

The paper presents various ways to accumulate the energy converted from the solar radiation in the electrical form: electrochemical batteries, grid storage, elevated water tank, hydrogen production and supercapacitors which are suitable for use in agriculture or rural areas. Along with the basic presentation, the most recent developments in each area are presented.

5

Behavioral characteristics of photovoltaic cell with different irradiation in Matlab/Simuling/Simscape environment

80%

Usman H. , Lawal S. M. , Shehu R. S.

International Letters of Chemistry, Physics and Astronomy

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2014

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tom Vol. 17, iss. 3

316--326

EN

Photovoltaic technology is one of the fastest growing energy among the different type of renewable energies that are available for electricity generation. This is due to the availability of the natural sun rise, and the non polluted energy that is free from emission of carbon dioxide (CO2). This paper presents a typical modeling of photovoltaic cell under different irradiations level, in order to monitor the behavior of the (Voltage-Current) V-I and (Power-Voltage) P-V characteristics. The simulation of the proposed model was performed in MATLAB/SIMULINK and Simscape environment. Single diode model of the PV system was presented in the mathematical modeling of the proposed system. Simulation results of different I-V and P-V characteristics were also presented.

6

Overview of the Situation on Photovoltaic Market in Selected Eastern European States after World Crisis in 2011

80%

Pavlíček M.

Equilibrium. Quarterly Journal of Economics and Economic Policy

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2012

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tom 7

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nr 3

EN

This article researches the situation on the photovoltaic markets in Slovakia, Romania and Hungary. It is focused on market analysis and prediction together with specific conditions on each market. An upward trend on photovoltaic markets is expected due to the favourable conditions given by the national governments and the European Union. However, state legislation harms competitive environment. There are no big differences between customers’ preferences in product features.

7

Power Sharing Strategy for Photovoltaic based Distributed Generators Operating in Parallel

80%

Patel U. N. , Patel H. H.

Transactions on Environment and Electrical Engineering

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2016

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tom Vol. 1, No. 4

1--9

EN

In many countries, the grid-code or standards do not allow the Photovoltaic (PV) inverters to exchange reactive power with the grid. Recently, some countries have relaxed the standards. Hence, capacity of the inverters to control reactive power must be utilized. However, the reactive power that a PV inverter can supply is constrained by the maximum power that a PV array generates and changes with the environmental conditions. A reactive power sharing algorithm is proposed that not only ensures proper distribution of reactive power amongst the inverters, but also ensures that the maximum power generated by PV is supplied to the grid. In case of identical PV inverters, the algorithm operates all inverters at nearly equal apparent power leading to nearly equal percentage utilization of the inverters, thereby achieving uniform heating of the similar devices of the inverters. The algorithms are further investigated for power sharing amongst PV inverters of unequal ratings. It is highlighted that the proposed algorithm results into the least change in the utilization factor of a PV inverter, whose power changes due to the change in environmental conditions. The effectiveness of the algorithm over other algorithms in sharing power amongst inverters is displayed through MATLAB/Simulink simulations.

8

Silicon solar cells with Al2O3 antireflection coating

80%

Dobrzański L. , Szindler M. , Drygała A. , Szindler M.

Open Physics

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2014

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tom 12

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nr 9

666-670

EN

The paper presents the possibility of using Al2O3 antireflection coatings deposited by atomic layer deposition ALD. The ALD method is based on alternate pulsing of the precursor gases and vapors onto the substrate surface and then chemisorption or surface reaction of the precursors. The reactor is purged with an inert gas between the precursor pulses. The Al2O3 thin film in structure of the finished solar cells can play the role of both antireflection and passivation layer which will simplify the process. For this research 50×50 mm monocrystalline silicon solar cells with one bus bar have been used. The metallic contacts were prepared by screen printing method and Al2O3 antireflection coating by ALD method. Results and their analysis allow to conclude that the Al2O3 antireflection coating deposited by ALD has a significant impact on the optoelectronic properties of the silicon solar cell. For about 80 nm of Al2O3 the best results were obtained in the wavelength range of 400 to 800 nm reducing the reflection to less than 1%. The difference in the solar cells efficiency between with and without antireflection coating was 5.28%. The LBIC scan measurements may indicate a positive influence of the thin film Al2O3 on the bulk passivation of the silicon.

9

Analysis of selected factors reducing the efficiency of silicon solar cells

80%

Stańco A.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

80-82

EN

The work referred to research on the factors which may contribute to decrease the efficiency of solar cells. Progressive degradation process for multi- and mono -crystalline solar cells was observed. Optical measurements showed that effective reflectance is worse for mc-Si than Cz-Si cells although they were coated antireflectol layer. It is caused generally by their heterogeneous structure. The process of texturization in case of Cz-Si improves their optical parameters. On the other hand it contributes to faster oxidation their surfaces. The process of obsolescence was finally corroborated by electrical measurements. The simulation of impact of heating showed, that its high values cause decrease of solar cells efficiency.

10

GaAsN as a photovoltaic material : photoelectrical characterization

80%

Kamyczek P. , Płaczek-Popko E. , Biegański P. , Zielony E. , Ściana B. , Tłaczała M.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

109-110

EN

In summary, we present in this study the results of studies on the layers of GaAs1-xNx grown on n-type GaAs substrates by atmospheric pressure metal organic vapour phase epitaxy (APMOVPE), Using transmittance, reflectance, photocurrent measurements and empirical expression for Eg a new nitrogen content for the studies samples was obtained. Using dark and illuminated I-V characteristics the main parameters of the Schottky contacts (short-circuit current Isc, open circuit-voltage, Voc, and fill factor, FF) were determined. Obtained contacts are promising for solar cell application.

11

Technological issues and optimization processes of junctions in a multijunction pv cell based on ingap/ingaas/ge materials

80%

Knyps P.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

107-108

EN

Epitaxial structures made from 3 different materials act as photovoltaic solar cells in different spectrum ranges. Their electrical parameters are still improved by optimization of technological processes. We also plan to interconnect the separate junction with the stacked triple junction cell by tunnel junctions.

12

Photoelectrical properties of photovoltaic structures based on CdTe/ZnO

80%

Zielony E. , Kamyczek P. , Biegański P. , Płaczek-Popko E. , Pietruszka R. , Łuka G. , Godlewski M.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

100-101

EN

The n-type ZnO layers were grown by ALD method on p-type CdTe substrate. I-V characteristics verified rectifying properties of the test ZnO/CdTe solar cell diode and exhibited photovoltaic effect when the junction was exposed to light. The series resistance of the diode, determined from the I-V curves, equals to 36 Ω. Such a high value is responsible for low value of fill factor and efficiency of the solar cell. Photoresponse properties of the studied junction were measured at room temperature. Efficient photoresponse was observed within wavelength range of 400-1000 nm. These results indicate that n-ZnO/p-CdTe junction is suitable for the fabrication of efficient solar cells. It was shown that the thickness of the ZnO layers can be also determined with the help of interference fringes of photoresponse analysis. Further work will involve a better understanding of the properties of window layer and junction formation processes.

13

Evaluation of surface morphology of texturized Si wafers for solar cells applications

80%

Białas S.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

94-97

PL

W pracy zbadano wpływ regularności ułożenia standardowej, piramidalnej tekstury, powstającej w wyniku anizotropowego trawienia krzemu w roztworach alkalicznych, na współczynniki odbicia światła. Przebadano dwa parametry: stopień pokrycia powierzchni teksturą i rozrzut wielkości piramid.

14

Research achievements of the DSOD Lodz in the field of photovoltaics

80%

Znajdek K. , Sibiński M.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

134-136

EN

Photovoltaic team of the Department of Semiconductor and Optoelectronic devices is a dynamic, young research group focused on technology of thin-film solar cells. Apart from educational activity many research projects and investigation were undertaken within last decade. The overall effort may be summarized by two finished, two running and two proposed national projects, twelve defended master thesis and one doctoral thesis in the field of photovoltaics. Additionally, one PhD dissertation and one DSc dissertation are to be finished in the near future. The group is actively cooperating with many national and some international partners in the field of photovoltaic technology and measurements. It is also worth to mention that the team is as well engaged in many PV educational projects, namely multi-university education program of EFS founds "Photovoltaic application training". Moreover voluntary student team, connected with DSOD photovoltaic group, is maintaining laboratory web site and is realizing numerous interesting interdisciplinary projects.

15

Organic photovoltaics : chosen aspects

80%

Szostak J. , Signerski R. , Żelechowska K. , Godlewski J.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

118-120

EN

There are many types of organic and organic/inorganic (hybrid) photovoltaic devices that possess many beneficial properties over inorganic solar cells. That makes the former suitable for a broad range of applications and hence so much attention is paid to their development. In spite of intensive research carried on this field of science and technology there are still many crucial problems that need to be solved. Extensive knowledge on physical basis of operation of organic and hybrid systems, fast development of nanotechnology, great variety of organic materials and methods of their modification will pave the way for commercial applications of these devices.

16

The influence of inclination and azimuth angle of PV modules on the energetic gain

80%

Bugała A. , Frydrychowicz-Jastrzębska G.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

131-133

EN

The angle of incidence of solar radiation on the PV panel or plane is a function on many factors: the angle of solar declination, the angle of latitude, the hour angle, the azimuth angle and the angle of receiver inclination to the ground. The declination angle depends on the day of the year, the hour angle taking the value in accordance to the time of the day, the angle of the latitude depends on the location. The next parameter, that is the azimuth angle of the receiver is the deflection accounted from the local meridian to the south direction. Dependence of the energy possible from Sun on the above mentioned parameters may be reduced by optimal orientation of the PV panel. Many authors dealt with this problem.

17

Surface morphology and optical properties of polymer thin films

80%

Weszka J. , Szindler M. , Bruma M.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

120-122

EN

The spin coating method allows the deposition of the uniform thin films. The process is dependent primarily on the correct preparation of the solution. In view of consideration both the results of surface topography and the absorbance of the best results were obtained for the thin film deposited at 3000 rev/min. Studies on the polymers conjugated are interesting because of their possible application in the structure of polymer solar cells and dye sensitized solar cells.

18

Printed transparent electrodes with graphene nanoplatelets

80%

Jakubowska M. , Słoma M. , Janczak D. , Młożniak A. , Wróblewski G.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

97-99

EN

GNPs based layers prepared with screen printing technology proved to have good mechanical resistance and high transparency. GNPs agglomerates were observed in investigated samples and they are the cause of the layer's resistance raise. Further investigation needs to be done to observe how such situation can be avoided. First experiments on carbon nanotubes layers showed that using dispersants prevents agglomerating. Without agglomerates appearing in the samples, conductivity improves consistently.

19

Multifunctional coatings for solar cells application

80%

Sieradzka K. , Mazur M. , Kaczmarek D. , Domaradzki J. , Wojcieszak D.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

102-104

EN

This paper briefly presents the main scientific directions and measurement opportunities of the staff from Laboratory of Optoelectrical Diagnostics of Nanomaterials situated at Wroclaw Univeristy of Technology. All discussed thin oxide films based on TiO₂ were prepared by High Energy Reactive Magnetron Sputtering method. As it was showed, control of material composition allows to obtain nanocrystalline, transparent semiconductors with particular type of conductivity. Additionally, in such thin films other desirable properties can be achieved simultaneously, e.g. photoactivity and reduced reflection. It testifies about great application potential of nanocrystalline TOS thin films as coatings for architectural glasses, windscreens, solar cells application.

20

Photovoltaic bulk heterojunctions with interpenetrating network based on semiconducting polymers

80%

Modzelewski M. , Klugmann-Radziemska E.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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tom Vol. 53, nr 6

122-125

EN

Poly(indenefluorene) belongs to the exotic and rare group of synthetic, photoactive, macromolecular compounds which may replace crystalline silicon in electronics in the future. Although the attempt of performance improvement it is highly probable that PIF itself is characterized by low exciton diffusion length and therefore (apart from PCBM and TCNQ) application of other electronacceptor in blends with that polymer may be pointless. There is a particular need of application other conjugated polymers with optimized band gap around 1.5 eV. Polymers with lower values of band gap may not deliver satisfying voltages even though they have well absorption properties. The main obstacle in commercial applications of low-band gap polymer based devices is that they have low values of operating currents and external quantum efficiencies. Few available examples of photovoltaic devices based of that kind of polymers manufactured in [3, 4] have EQEs less than 0,01%. New bulks based on other macromolecular chromophores are needed as presented devices based on PIF may be used only as a photonic detector of radiation.