Wyniki wyszukiwania - Biblioteka Nauki

1

Nanocrystalline TiO2 Powder Prepared by Sol-Gel Method for Dye-Sensitized Solar Cells

100%

Dobrzański L. A. , Szindler M. M. , Szindler M. , Lukaszkowicz K. , Drygała A. , Prokopiuk vel Prokopowicz M.

Archives of Metallurgy and Materials

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2016

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tom Vol. 61, iss. 2A

833--836

EN

In this study titanium dioxide nanopowder has been manufactured and examined. Nanocrystalline TiO2 powder has been obtained by hydrolysis and peptization of a solution of titanium isopropoxide and isopropanol. Subsequently, produced powder has been subjected to structural analysis by using a transmission electron microscope, X-ray diffractometer, and Raman spectrometer. For comparison purposes, a commercially available titanium dioxide powder (i.e. titanium white) was also used. Thin layers have been made from this powder and further have been examined by using a UV/VIS spectrometer. Completed research shows the nanocrystalline structure of obtained layers and their good properties such as absorbance at the range of wavelength equal 200 - 1000 nm.

2

Carbon Nanomaterials Application as a Counter Electrode for Dye-Sensitized Solar Cells

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Dobrzański A. , Prokopiuk vel Prokopowicz M. , Drygała A. , Wierzbicka A. , Lukaszkowicz K. , Szindler M.

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tom Vol. 62, iss. 1

27--32

EN

The paper presents the results of the structure investigation of a counter electrode in dye-sensitized solar cells using the carbon nanomaterials. Solar cells were fabricated on the glass with transparent conductive oxide TCO (10Ω/sq). Nanocrystalline titania based photoanode was prepared by spreading TiO2 paste onto TCO glass and subsequently annealed at 450°C for at least 30 min to convert anatase phase and make an interparticle network. After then the nanostructured titania films was immersed into an ethanolic solution of the ruthenium-based dye. As a counter electrodes of dye-sensitized solar cells composite films of carbon nanomaterials and polystyrene sulfonate doped poly (3,4-ethylenedioxythiophene) PEDOT-PSS (Sigma-Aldrich) were deposited onto TCO substrates. Because carbon nanoelements and titanium oxide consist of nano-metric structural units to determine the properties of the cells and their parameters several surface sensitive techniques and methods, i.e. Raman spectroscopy, Scanning Electron Microscopy (SEM), High-Resolution Transmission Electron Microscopy (HRTEM), and electric properties of conductive layers were used.

3

Partially nanowire-structured TiO2 electrode for dye-sensitized solar cells

100%

Suzuki Y. , Ngamsinlapasathian S. , Yoshida R. , Yoshikawa S.

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tom 4

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nr 3

476-488

EN

Partially nanowire-structured TiO2 was prepared by a hydrothermal processing followed by calcination in air. The hydrogen titanate powder as-synthesized was calcined at 300 °C for 4 h to obtain the partially nanowire-structured TiO2. A dye-sensitized solar cell (DSC) with a film thickness of 5.6 μm, fabricated using the partially nanowire-structured TiO2 showed better performance than using a fully nanowire-structured TiO2 or a conventional equi-axed TiO2 nanopowder. The short-circuit current density (JSC), the open-circuit voltage (VOC), the fill factor (FF) and the overall efficiency (η) are 11.9 mA/cm2, 0.754 V, 0.673 and 6.01 %, respectively. The effects of one-dimensional nanostructure and electron expressway concept are discussed.

4

A new direction in design and manufacture of co-sensitized dye solar cells : toward concurrent optimization of power conversion efficiency and durability

88%

Hosseinnezhad M. , Shadman A. , Saeb M. R. , Mohammadi Y.

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2017

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tom Vol. 25, No. 3

229--237

EN

A novel methodology was implemented in the present study to concurrently control power conversion efficiency (η) and durability (D) of co-sensitized dye solar cells. Applying response surface methodology (RSM) and Desirability Function (DF), the main influential assembling (dye volume ratio and anti-aggregation agent concentration) and operational (performance temperature) parameters were systematically changed to probe their main and interactive effects on the η and D responses. Individual optimization based on RSM elucidated that D can be solely controlled by changing the ratio of vat-based organic photosensitizers, whereas η takes both effects of dye volume ratio and anti-aggregation concentration into account. Among the studied factors, the performance temperature played the most vital role in η and D regulation. In particular, however, multi-objective optimization by DF explored the degree to which one should be careful about manipulation of assembling and operational parameters in the way maximization of performance of a co-sensitized dye solar cell.

5

The influence of reduced graphene oxide on the structure of the electrodes and the properties of dye-sensitized solar cells

63%

Dobrzański L. A. , Prokopiuk v. P. M.

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tom Vol. 77, nr 1

12--30

EN

Purpose of the paper: The aim of the research is to investigate the influence of the structure and chemical composition of the surface layers containing reduced oxide graphene on the properties of dye-sensitized solar cells, and to determine the correlation between the morphology and physicochemical properties of reduced graphene oxide and the electrical and optical properties of dye-sensitized solar cells, which will result in the desired effects reducing production costs and increasing the efficiency of dye cells. Design/methodology/approach: Complete manufacturing technology of dye-sensitized solar cells included the selection of the conditions of the thermal reduction of graphene oxide, the development of manufacturing technology of photoanode with and without reduced graphene oxide, the development of manufacturing technologies of counter electrodes with the reduced graphene oxide and the production of dye-sensitized solar cells by combining photoanode and counter electrode and filling the space between them by the electrolyte. Findings: A reduced graphene oxide layers applied to a glass substrate with transparent conductive oxide, used as a counter electrode and photoanode effect on reducing the degree of recombination and increasing electrochemical properties, which makes them important factors in increasing the efficiency of photovoltaic cells and reduce their manufacturing costs. Research limitations/implications: Dye-sensitized solar cells research develop in the direction to increase their efficiency and reduce manufacturing costs, among others, by modifying the chemical composition and structure of the main components: photoanode and counter electrode. Using one of the most expensive materials in the world - a platinum as a catalytic layer causes a significant increase in production costs. For this reason, it is important to search for new materials that can replace the expensive platinum. Practical implications: Developed in this work producing technology of photoanode and the counter electrode containing reduced graphene oxide is an attractive alternative to dye-sensitized solar cell by reducing the manufacturing cost by eliminating costly layer of platinum while maintaining a relatively high efficiency, high transmittance and low resistance of charge transfer at the interlayer counter electrode/electrolyte. Originality/value: In the paper, the reduced graphene oxide was applied as both photoanode and the counter electrode in dye-sensitized solar cells.

6

Effect of low temperature annealing on anatase TiO2 layer as photoanode for dye-sensitized solar cell

63%

Noorasid N. S. , Arith F. , Mustafa A. N. , Azam M. A. , Suhaimy S. H. M. , Al-Ani, O. A.

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tom R. 97, nr 10

12--16

EN

Dye-Sensitized Solar Cells (DSSCs) have been successfully fabricated with a low annealing temperature (100 °C to 500 °C) approach to the anatase TiO2 photoanode deposited by a screen-printing method. In this paper, the surface morphology and structure of the TiO2 thin films were studied using Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD) and Raman Spectroscope while I-V characteristic was used for the electrical properties. Sample with an annealing temperature of 300 °C displays a good feature in terms of porosity and enhanced agglomerated surface.

PL

Ogniwa słoneczne uczulone barwnikiem (DSSC) zostały z powodzeniem wyprodukowane przy niskiej temperaturze wyżarzania (100 °C do 500 °C) z fotokomórką anatazu TiO2 osadzaną metodą sitodruku. W artykule zbadano morfologię powierzchni i strukturę cienkich warstw TiO2 przy użyciu skaningowego mikroskopu elektronowego (SEM), dyfrakcji promieniowania rentgenowskiego (XRD) i spektroskopu Ramana, natomiast dla właściwości elektrycznych wykorzystano charakterystykę I-V. Próbka o temperaturze wyżarzania 300 °C wykazuje dobrą cechę pod względem porowatości i zwiększonej powierzchni zaglomerowanej.

7

Improved Light Conversion Efficiency Of Dye-Sensitized Solar Cell By Dispersing Submicron-Sized Granules Into The Nano-Sized TiO2 Layer

63%

Song S. A. , Lim M. J. , Jung K. Y. , So W.-W. , Moon S.-J.

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tom Vol. 60, iss. 2B

1467--1471

EN

In this work, TiO2 nanoparticles and submicron-sized granules were synthesized by a hydrothermal method and spray pyrolysis, respectively. Submicron-sized granules were dispersed into the nano-sized TiO2 layer to improve the light conversion efficiency. Granules showed better light scattering, but lower in terms of the dye-loading quantity and recombination resistance compared with nanoparticles. Consequently, the nano-sized TiO2 layer had higher cell efficiency than the granulized TiO2 layer. When dispersed granules into the nanoparticle layer, the light scattering was enhanced without the loss of dye-loading quantities. The dispersion of granulized TiO2 led to increase the cell efficiency up to 6.51%, which was about 5.2 % higher than that of the electrode consisting of only TiO2 nanoparticles. Finally, the optimal hydrothermal temperature and dispersing quantity of granules were found to be 200°C and 20 wt%, respectively.

8

Instalacja fotowoltaiczna z wykorzystaniem najnowszej technologii PV

51%

Fal J. , Stępień W. , Cholewa M.

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tom R. 59, nr 10

1093--1096

PL

Praca przedstawia projekt instalacji fotowoltaicznej, w skład której wchodzą technologie barwnikowych ogniw organicznych DSSC oraz krzemowe, wysokowydajne ogniwa typu back-contact. Oba rozwiązania opisano i scharakteryzowano ich zalety oraz wady. Projekt swym zasięgiem obejmuje południowo-wschodnią część budynku „K” Politechniki Rzeszowskiej W pracy przedstawiono również krótką charakterystykę warunków solarnych Rzeszowa na podstawie danych meteorologicznych ze stacji Rzeszów-Jasionka. Korzystając z oprogramowania PVSOL przeprowadzono symulację systemu pod kątem potencjalnych zysków energii, które porównano z aktualnymi potrzebami energetycznymi budynku.

EN

The paper presents the design of photovoltaic installation, which covers the south-eastern part of the building "K" of Rzeszów University of Technology. In this building there are rooms of the Department of Physics, being the initiator of the project. This work describes the Polish solar conditions, in particular Subcarpathian (Fig. 1) [3, 4, 11]. In the following characterizes key assumptions the design. There is described the principle of operation of photovoltaic technologies used with the advantages and disadvantages of each of them [15]. The basic parameters of the cells used in the project, together with the Energy Management System are characterized [13]. The paper presents design solutions fixing installations and drawings showing the appearance of the facade covered by installing a PV system (Figs. 4-9). Using the software PVSOL Valentin, the authors performed a simulation of the designed system for potential energy yields and estimated the theoretical efficiency of the installation for the parameters assumed in the project. The results are presented in the form of graphs and compared with the current energy needs of the building (Figs.10-11). Based on the obtained results, it was found that the designed system would only cover about 10% of the building electricity.