Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 11

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

Search:
in the keywords:  84.60.Jt
help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Using Photovoltaic Panels for Irrigation

100%
Senpinar A.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
625-628
EN
Renewable energy sources are getting more and more popular due to the increasing world population and decreasing conventional sources. In recent years, climate change and global warming have also increased the amount of water needed for irrigation. Renewable energy sources may therefore be used to develop photovoltaic pumping systems. Using photovoltaic arrays to drive water pumping units for irrigation in remote areas and desert regions is an economical solution. The sizing of photovoltaic pumping systems is important in order to optimize the power peak of photovoltaic array and for the choice of motor, pump and inverter (when needed). A photovoltaic pumping system consists of at least six basic components: a photovoltaic array, a dc pump motor, a battery-charge regulator, a water tank, humidity sensors and an electronic control unit. The usage of such system is in a natural relationship between the availability of solar radiation and water requirement. In this study, the designed system is an electronically controlled system, based on humidity sensors. The water requirement increases with increasing solar radiation. Hence, the dc motor is operated by means of an electronic control unit. When humidity in the soil reaches a certain value, the dc motor is stopped. The operation of the control unit relies on the data received from humidity sensors. The designed system was implemented and the obtained results were satisfactory.
2
Content available remote

Influence of Physical Characteristics οf Flat Aluminum Concentrators on Energy Efficiency of PV/Thermal Collector

63%
Kostic L., Pavlovic T., Pavlovic Z.
|
EN
In this paper the results of the influence of physical characteristics of flat plate solar radiation concentrators made of Al sheet and Al foil on energy efficiency of PV/thermal collector are presented. The measurements results obtained by means of scanning electron microscope, reflectance and chemical composition of solar radiation concentrators are given. Optimal position of solar radiation concentrators and appropriate thermal and electrical energy of PV/thermal collector were determined. Total generated thermal and electrical energy during the day by PV/thermal collector with concentrators in optimal position are higher than the total generated thermal and electrical energy obtained by PV/thermal collector without concentrators.
3
Content available remote

Limitations on Thickness of Absorber Layer in CdS/CdTe Solar Cells

51%
Mykytyuk T., Roshko V., Kosyachenko L., Grushko E.
Acta Physica Polonica A
|
2012
|
vol. 122
|
issue 6
1073-1076
EN
Calculations of the integrated absorptive capacity of CdTe layer taking into account the spectrum of the AM1.5 solar radiation and the absorption coefficient of CdTe are carried out. The recombination losses at the front and rear surfaces of the CdTe layer and in the space-charge region are also calculated based on the continuity equation. The restrictions on the thickness of CdTe in CdS/CdTe heterojunction have been ascertained taking into account all types of losses. It is shown that in CdTe, the almost complete absorption of photons (99.9%) in the hν > E_{g} range is observed at a layer thickness of more than 20-30 μm, and the absorptive capacity of photons in a CdTe layer of thickness 1 μm is about 93%. The obtained results indicate that when the CdTe absorber layer is very thin, it is impossible to avoid a noticeable decrease of the short circuit current density J_{sc} as compared with a typical thickness of the absorber layer. The loss in J_{sc} is 19-20% when the thickness is 0.5 μm compared to 5% for a thickness of 2-3 μm.
4
Content available remote

Spectral Distribution of Photoelectric Efficiency οf Thin-Film CdS/CdTe Heterostructure

51%
Kosyachenko L., Lashkarev G., Grushko E., Ievtushenko A., Sklyarchuk V., Mathew X., Paulson P.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue 5
862-864
EN
The spectral distribution of the quantum efficiency in thin-film CdS/CdTe solar cells is being investigated by taking into account the drift and diffusion components of photocurrent, recombination at the CdS-CdTe interface, the back surface of the CdTe absorber layer and in the space-charge region. The effect of uncompensated acceptor concentration, lifetime of minority carriers and surface recombination velocity on the charge collection efficiency are discussed. The losses caused by reflections and absorption in the CdS and indium tin oxide layers are also considered.
5
Publication available in full text mode
Content available

Ultrafast Bimolecular Recombination in Nanocrystalline Hydrogenated Silicon

51%
Nekrašas N., Sliaužys G., Juška G., Arlauskas K., Stuchlik J., Kočka J.
Acta Physica Polonica A
|
2005
|
vol. 107
|
issue 2
373-376
EN
In the multilayers of hydrogenated nanocrystalline and amorphous silicon bimolecular recombination coefficient can be reduced in half, while in low-temperature hydrogenated nanocrystalline silicon samples it can be reduced by one order of magnitude. The similarity of the activation energies of both the bimolecular recombination (B) and the Langevin-type recombination (B_L) coefficients point to decisive role of tunneling in processes of meeting of electrons and holes, although the ratio B/B_L<0.01.
6
Content available remote

Theoretical Analysis of Optical Losses in CdS/CdTe Solar Cells

51%
Roshko V., Kosyachenko L., Grushko E.
Acta Physica Polonica A
|
2011
|
vol. 120
|
issue 5
954-956
EN
Based on the known refractive index and extinction coefficient, calculations of optical losses in glass/transparent conducting oxide/CdS/CdTe solar cells have been carried out taking into account reflections at the interfaces and absorption in the transparent conducting oxide (indium tin oxide or SnO_2:F) and CdS layers. It has been shown that the losses caused by reflections at the interfaces result in lowering the short-circuit current by ≈ 9% whereas absorption in the transparent conducting oxide and CdS layers with the typical thicknesses lead to losses of 15-16% for glass/SnO_2/CdS/CdTe, and 22-24% for glass/indium tin oxide/CdS/CdTe solar cells.
7
Content available remote

Peculiarities of High Power Infrared Detection on Narrow-Gap Semiconductor p-n Junctions

51%
Gradauskas J., Širmulis E., Ašmontas S., Sužiedėlis A., Dashevsky Z., Kasiyan V.
Acta Physica Polonica A
|
2011
|
vol. 119
|
issue 2
237-240
EN
We report on experimental results of photosignal investigation in HgCdTe, InSb and PbTe semiconductor p-n junctions under the action of an intense pulsed CO_2 laser. The influence of laser power, external bias voltage as well as the diode temperature on the photosignal formation has been studied. We show that under certain conditions both classical photovoltaic and hot carrier phenomena may act simultaneously within a junction thus strongly impacting on responsivity and speed of operation of the device. The drawn conclusions may be of great importance for the development of high power optoelectronic devices.
8
Content available remote

A Review of MPPT Algorithms for Partial Shading Conditions

51%
Erdem Z.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
1128-1133
EN
Maximum power point tracker in a photovoltaic system allows to maximize the energy drawn from the connected photovoltaic modules. In the partial shade conditions there can be more than one maximum point in photovoltaic output power curve. The solution for this situation is a maximum power point tracker algorithm, which finds the global maximum. In literature, there is a large number of studies on maximum power point trackers. Therefore designers are drowning in a sea of knowledge. This study eliminates similar studies and classified them into groups, and at the end of the study a comparison table is given to guide the designers in the performance information of the selected studies. This study aims to guide the designers to make a sensible selection of a maximum power point tracker algorithm for partial shade conditions.
9
Content available remote

Dye Aggregation Influence on Dye Sensitized Solar Cell Performance in Nanocoral ZnO-Based Thin Film Cells Sensitized with N-719 and Rose Bengal Dyes

51%
Borysiewicz M., Chusnutdinow S., Wzorek M., Wojciechowski T.
Acta Physica Polonica A
|
2016
|
vol. 130
|
issue 5
1187-1189
EN
Dye sensitized solar cells were fabricated using ZnO nanostructured photoelectrodes sensitized with N-719 or Rose Bengal dyes. We assessed the device performance as a function of the sensitization time and found a dependence on time for the N-719 and no significant changes for the Rose Bengal. Furthermore, we observe that the structure of the N-719 molecule beneficial for sensitization of TiO₂ may lead to the degradation of the ZnO crystals and a growth of an amorphous shell limiting dye performance in the cells.
10
Content available remote

Ultrathin Glass for the Photovoltaic Applications

45%
Dziedzic J., Inglot M.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 1
176-178
EN
Chemically strengthened ultrathin glass with a thickness of less than 1 mm has many advantages, such as flexibility, smooth surface, good transmittance, excellent gas and water barrier, much higher toughened in relations to thermally tempered glass, higher impact resistance, increased corrosion resistance and much higher abrasion rate. Chemical strengthening process is a process where an ion exchange occurs by diffusion between the glass panes and the brine solution bath. The deeper penetration of the glass surface by ions contained in the brine bath contributes to the hardness of the glass sheets, which reduces the occurrence of surface defects that cause reflections. From the point of view of photovoltaic applications ultrathin glass significantly reduces the weight of the whole photovoltaic panel structure with respect to known solutions. Furthermore, the reduction of the glass thickness increases the transmission of solar energy in the visible range directly through the glass. In addition, chemical tempered glass has a lower reflectance of light from the surface than the thermally tempered glass. What is more, ultrathin glass is perfect substrate for deposition of nanomaterials, i.e. conductive films or quantum dots. In this work we demonstrate that chemically strengthened ultrathin glass is a perfect material for the photovoltaic applications, i.e. as a substrate for deposition of thin layers and for the design of photovoltaic modules of reduced weight.
11
Content available remote

Effect of Spectral Irradiance Distribution on the Performance of Solar Cells

45%
Guechi A., Chegaar M., Merabet A.
Acta Physica Polonica A
|
2011
|
vol. 120
|
issue 6A
A-43-A-46
EN
In this paper, the global and diffuse solar radiation incident on solar cells is simulated using a spectral model SMARTS2, for varying atmospheric conditions on the site of Setif. The effect of changes in total intensity and spectral distribution on the short circuit current and efficiency of different kinds of thin film solar cells (CdTe, nc-Si:H and copper indium gallium selenide, CIGS) is examined. The results show a reduction in the short circuit current due to increasing turbidity. It is 18.82%, 27.06% and 26.80% under global radiation and for CdTe, nanocrystalline silicon (nc-Si:H), and CIGS solar cells, respectively. However it increases under diffuse radiation. Increasing water vapor in the atmosphere leads to a reduction in the short circuit current of 3.15%, 2.38%, and 2.45%, respectively, for CdTe, nc-Si:H, and CIGS cells under global radiation and it is not influenced under diffuse radiation. The performance of the solar cells is notably reduced, both in terms of efficiency and open circuit voltage, with increasing air mass.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.