Wyniki wyszukiwania - Biblioteka Nauki

1

Struktura i własności warstw Al₂O₃ osadzonych metodą ALD na krzemowych ogniwach fotowoltaicznych

100%

Szindler M. , Szindler M.

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2018

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tom Vol. 59, nr 9

9--11

PL

W pracy zbadano możliwości zminimalizowania współczynnika odbicia światła, a w konsekwencji zwiększenia sprawności wytwarzanych krzemowych ogniw fotowoltaicznych, poprzez wytworzenie cienkiej warstwy antyrefleksyjnej Al₂O₃ metodą atomowego osadzania warstw. Badania morfologii powierzchni warstw wykonano przy użyciu skaningowego mikroskopu elektronowego, z kolei strukturę zbadano przy użyciu dyfraktometru rentgenowskiego. W celu okreslenia własności optycznych cienkich warstw Al₂O₃ wykonano badania współczynnika odbicia światła przy użyciu spektrofotometru. Ogniwo fotowoltaiczne z osadzoną w temperaturze 300°C metodą ALD warstwą antyrefleksyjną przy zadanej liczbie cykli 830 osiągnęło sprawność 12,51%, podczas gdy sprawność ogniwa referencyjnego bez warstwy antyrefleksyjnej wyniosła 7,22%.

EN

The main goal of the study was to examine the possibility of minimizing the reflectance of light, and consequently increasing the efficiency of the produced silicon solar cells, by creating an Al₂O₃ antireflection coating by atomic layer deposition method (ALD). Surface layer morphology studies were performed by using scanning electron microscopy, while the structure was examined by using an X-ray diffractometer. In order to determine the optical properties of the Al₂O₃ thin films, light reflectance measurements were performed using a spectrophotometer. The solar cell with deposited antireflection coating by the ALD method with a 830 number of cycles at 300°C reached the efficiency of 12.51%, while the efficiency of the reference cell is 7.22%.

2

Barwnikowe ogniwa fotowoltaiczne z polielektrolitem

100%

Szindler M. , Szindler M.

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2018

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tom R. 94, nr 8

32--34

PL

W ramach pracy dokonano optymalizacji warunków osadzania cienkich warstw polimerowych oraz składu chemicznego nanoszonych roztworów. Zbadano możliwość zastąpienia ciekłego elektrolitu w barwnikowym ogniwie fotowoltaicznym cienką warstwą materiału polimerowego przewodzącego prąd elektryczny. Wytworzono i zbadano serię barwnikowych ogniw fotowoltaicznych o następującej budowie: ITO/TiO2/barwnik/warstwa aktywna/Al oraz standardowe ogniwa barwnikowe DSSC z ciekłym elektrolitem. Wykazano, że w barwnikowym ogniwie fotowoltaicznym ciekły elektrolit można zastąpić cienką warstwą materiału polimerowego z dodatkiem jodku potasu.

EN

The deposition conditions of polymer thin film and the solutions chemical composition were optimized. The possibility of replacing a liquid electrolyte in a photovoltaic cell with a thin film of an electrically conductive polymeric material was investigated. A series of solar photovoltaic cells with the following structure: ITO/TiO2/dye/active layer/Al and standard DSSC with liquid electrolyte was prepared and tested. It has been shown that in a DSSC the liquid electrolyte can be replaced by a thin film of a polymeric material dopped potassium iodide.

3

Badania własności elektrycznych ogniw fotowoltaicznych

80%

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

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tom R. 23, nr 2

22--26

4

Synthesis and properties of TiO2, NiO and ZnO nanoparticles and their possible biomedical application

71%

Szmajnta K. , Szindler M.

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tom Vol. 98, nr 2

81--84

EN

Purpose: The main purpose of this publication is to bring closer method of synthesis and examining basic properties of TiO2, ZnO and NiO nanoparticles (NPs), and investigate their possible biomedical application. Design/methodology/approach: Nanopowders were made with sol-gel method. Surface morphology studies of the obtained materials were made using Zeiss's Supra 35 scanning electron microscope and the structure using S/TEM TITAN 80-300 transmission electron microscope. In order to confirm the chemical composition of observed nanopowders, qualitative tests were performed by means of spectroscopy of scattered X-ray energy using the Energy Dispersive Spectrometer (EDS). The DLS (Dynamic Light Scattering) method was used to analyse the particle size distribution using the AntonPaar Litesizer 500 nanoparticle size analyser. Changes in particle size distribution at elevated temperatures were also observed. The TiO2, ZnO and NiO NPs with spherical shape were successfully produced by sol-gel method. Findings: The diameter of the as prepared nanoparticles does not exceed 25 nm which is confirmed by the TEM analysis. The highest proportion among the agglomerates of the nanoparticles has been shown to show those with a diameter of 80 to 125 nm. The qualitative analysis of EDS confirmed the chemical composition of the material. Practical implications: Nanoparticles (NPs) has been receiving an incrementally increasing interest within biomedical fields researchers. Nanoparticles properties (physical, chemical, mechanical, optical, electrical, magnetic, etc.) are different from the properties of their counterparts with a larger particle size. Originality/value: The nanoparticles were prepared using sol-gel method which allows the particle size to be controlled in a simple way.

5

Sol gel TiO2 antireflection coatings for Silicon solar cells

71%

Dobrzański L. A. , Szindler M.

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tom Vol. 52, nr 1

7--14

EN

Purpose: The aim of this paper was to investigate changes in surface morphology and optical reflection of thin films of titanium dioxide. Thin films were prepared using sol gel spin coating method. Design/methodology/approach: The microanalysis have been investigated by the Energy-dispersive X-ray spectroscopy EDS. The changes in surface topography was observed by the atomic force microscope AFM and scanning electron microscope SEM. The results of roughness have been prepared in the software XEI Park Systems and optical reflection by the spectrometer UV/VIS. Findings: Results and their analysis allow to conclude that the titanium isopropoxide concentration in solution and spin speed, which is an important factor in spin coating technology has a significant influence on surface morphology and optical reflection of thin films titanium dioxide. Practical implications: Known sol gel titanium dioxide optical parameters and the possibility of obtaining a uniform thin films show that it can be good material for photovoltaic application. Originality/value: The paper presents some researches of titanium dioxide thin films deposited by sol gel spin coating method on monocrystalline silicon.

6

Characteristics of ZnO thin films deposited by atomic layer deposition

57%

Boryło P. , Lukaszkowicz K. , Szindler M. , Basiaga M.

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tom Vol. 73, nr 2

86--91

EN

Purpose:The aim of this article was to examine the adhesion of ZnO thin films and the influence of temperature deposition process on their morphology. ZnO thin films have been deposited by atomic layer deposition. Design/methodology/approach: Adhesion of ZnO thin films was investigated using the scratch test method. Changes in the surface morphology were observed by scanning electron microscope (SEM). In order to confirm the chemical composition and phase investigated of thin films was carried out Energy-dispersive X-ray spectroscopy EDS and X-ray analysis. Findings: Results and their analysis have shown that the ZnO thin films deposited by ALD are uniform and homogenous. Significant impact on their morphology has the temperature of the deposition process. In the case of the adhesion temperature is negligible. Practical implications: Knowledge about the ALD ZnO thin films are possibility to obtaining a uniform thin films show that material has a big potential in optoelectronics and photovoltaic application. Originality/value: The article presents the original research results of the structure and properties of ZnO thin films deposited by ALD method, that can replace a commonly used transparent conductive layer.

7

ZnO nanocrystalline powder prepared by sol-gel method for photoanode of dye sensitized solar cells application

57%

Szindler M. , Szindler M. M. , Boryło P.

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2018

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tom Vol. 88, nr 1

12--17

EN

Purpose: The article presents the results of research on ZnO nanopowder prepared using sol-gel method that is the easy process enabling us to control shape and size of particles The purpose of this article is to synthesized ZnO nanostructures by sol-gel method and characterized them for use in dye sensitized solar cells. Design/methodology/approach: Zinc oxide nanopowder was synthesized by using zinc acetate dehydrate as a precursor. The prepared nanopowder has been subjected to structural analysis using a transmission electron microscope (TEM). Scanning Electron Microscopic (SEM) images were taken with a Zeiss Supra 35. Qualitative studies of chemical composition were also performed using the Energy Dispersive Spectrometer (EDS). The structure of zinc oxide was investigated by X-ray crystallography The absorbance of zinc oxide layers with and without dye were measured by Thermo Scientific Evolution 220 spectrophotometer equipped with a xenon lamp in the wavelength range from 190 nm to 1100 nm. Findings: Sol-gel method allows the formation of uniform nanoparticles of zinc oxide. The nanoparticles have been successfully used in photoelectrode of dye sensitized solar cell. The light harvesting efficiency of the electrode it remains in a wide spectral range above 85%, which gives better results than in the case of titanium dioxide. Research limitations/implications: The next step in the research will be to investigate the ZnO/NiO composite on the properties of the photoelectrode of dye sensitized solar cell. Practical implications: he unique properties of produced ZnO nanostructural materials have caused their interest in such fields as medicine, transparent electronics and photovoltaics. Originality/value: The ZnO nanoparticles were prepared using sol-gel method and then effectively used in the photoanode of dye sensitized solar cell.

8

Influence of solvent on the surface morphology and optoelectronic properties of a spin coated polymer thin films

57%

Weszka J. , Szindler M. M. , Szczęsna M. , Szindler M.

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2013

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tom Vol. 61, nr 2

302—307

EN

Purpose: The aim of this paper was to investigate changes in surface morphology and optoelectronic properties of MEH-PPV thin films. Thin films were prepared using spin coating method. Design/methodology/approach: The changes in surface topography was observed by the atomic force microscope AFM. The results of thin films roughness have been prepared in the software XEI. The UV/VIS spectrometer was used to investigate absorbance of the obtained thin films. Findings: Results and their analysis allow to conclude that the solvent, which is an important factor in spin coating technology has an influence on surface morphology and optoelectronic properties of MEH-PPV thin films. Practical implications: Known MEH-PPV optoeletronic properties and the possibility of obtaining a uniform thin film show that it can be a good material for optoelectronic and photovoltaic application. Originality/value: The paper presents some researches of MEH-PPV thin films deposited by spin coating method deposition on glass BK7. A MEH-PPV solution was prepared using three different solvents: chlorobenzene, chloroform and pyridine.

9

Surface morphology and optical properties of polymer thin films

57%

Weszka J. , Szindler M. , Bruma M.

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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.

10

CLSM and UV-VIS researches on polyoxadiazoles thin films

50%

Weszka J. , Szindler M. , Chwastek-Ogierman M. , Bruma M. , Jarka P.

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2012

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tom Vol. 55, nr 2

53-61

EN

Purpose: The purpose of this paper was to analyse the surface morphology and optical properties of polyoxadiazoles thin films. Design/methodology/approach: A few different conducting polymers were dissolved in N-methyl-2-pyrrolid(in)one. Then the solutions were deposited on a glass substrate by spin coating method with a different spin rate. Changes in surface topography and optical properties were observed. A confocal laser scanning microscope CLSM Zeiss LSM 5 Exciter has been used. Photos have been taken from area of 120 x 120 microns. Findings: The analysis of images and spectra has confirmed that the quality of thin films depends upon the used polymers. It was also observed that the parameters of the spin coating method have significant effect on the morphology and the optical properties. The spin rate has got a strong impact on them. Research limitations/implications: The morphology and optical properties of polyoxadiazoles thin films has been described. This paper include description how the spin rate influence on the polymer thin films. In order to use a polymer thin film in photovoltaics or optoelectronics it must have a high internal transmission density. Further research of polymer thin films are recommended. Practical implications: The spin coating method allows to deposit a uniform thin films. It is important to know how the spin rate influence on the thin films properties. It is also important to find a new use for this group of material engineering in photovoltaic or optoelectronics devices. Originality/value: The good properties of thin films make them suitable for various applications. The value of this paper is defining the optimal parameters of spin-coating technology for polyoxadiazoles thin films. The results allow the choosing optimal parameters of the deposition process. Spin coating is a very good method to obtain thin films which are obligated to have the same thickness over the whole surface.

11

Reconstruction of thin films polyazomethine based on microscopic images

50%

Weszka J. , Szindler M. , Śliwa A. , Hajduk B. , Jurusik J.

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2011

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tom Vol. 48, nr 1

40-48

EN

The aim of this paper was to investigate changes in surface morphology of thin films of polyazomethine PPI. Thin films were prepared using low-temperature chemical vapor deposition (CVD) method.

12

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

43%

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.

13

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

43%

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.

14

Visualisation of ankle injury using a thermal imaging camera

43%

Kozarski Ł. , Kuźma T. , Pisz A. , Łabuz-Roszak M. , Kozarska M. , Szindler M. , Roszak M.

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tom Vol. 80, nr 2

59--63

EN

Purpose: This paper is dedicated to the study of the impact of multiple ankle injuries on blood flow in the lower limb. Design/methodology/approach: The study was performed using a thermal imaging camera which by differentiating temperature between the uninjured and injured leg enabled checking and comparing blood flow between both limbs. Findings: The patient subjected to the examination had suffered multiple ankle injuries. The images were taken before and after rehabilitation procedures so as to compare the temperature. Research limitations/implications: By using thermal imaging, the temperature differences within structures can be observed, which in turn attests to limited blood flow. Improper trophic might have had an influence on a slow recovery process. Practical implications: Analysis of image taken using a thermal imaging camera facilitates localizing damaged structures and planning the treatment process that aims at normalizing temperature differences between limbs. Moreover, the analysis of further images, taken during the treatment process enables us to evaluate the effectiveness of the selected method of treatment and to change the method if needed. The evaluation is entirely objective and it enables eliminating reliance on patient’s feedback, which is often subjective and unreliable. Originality/value: The study shows possibility of usage thermal imaging camera in traumatology.

15

Carbon Nanotubes Counter Electrode for Dye-Sensitized Solar Cells Application

43%

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

Archives of Metallurgy and Materials

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2016

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tom Vol. 61, iss. 2A

803--806

EN

The influence of the carbon nanotubes counter electrode deposited on the FTO glass substrates on the structure and optoelectrical properties of dye-sensitized solar cells counter electrode (CE) was analysed. Carbon materials have been applied in DSSC s in order to produce low-cost solar cells with reasonable efficiency. Platinum is a preferred material for the counter electrode because of its high conductivity and catalytic activity. However, the costs of manufacturing of the platinum counter electrode limit its use to large-scale applications in solar cells. This paper presents the results of examining the structure and properties of the studied layers, defining optical properties of conductive layers and electrical properties of dye-sensitized solar cells manufactured with the use of carbon nanotubes. Such counter electrodes are promising for the future fabrication of stable, low-cost and effective dye-sensitized solar cells.

16

Carbon Nanotubes Counter Electrode for Dye-Sensitized Solar Cells Application

43%

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

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17

Metallic skeletons as reinforcement of new composite materials applied in orthopaedics and dentistry

36%

Dobrzański L. A. , Dobrzańska-Danikiewicz A. D. , Czuba Z. P. , Dobrzański L. B. , Achtelik-Franczak A. , Malara P. , Szindler M. , Kroll L.

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tom Vol. 92, nr 2

53--85

EN

Purpose: The article concerns the development of completely new groups of composite materials that can be used to produce functional replacements for damaged bones or teeth. Design/methodology/approach: A selective laser sintering was used to produce the reinforcement of those materials from titanium and its Ti6Al4V alloy in the form of skeletons with pores with adjustable geometric features. The matrix of those materials is either air or crystallised from the liquid AlSi12 or AlSi7Mg0.3 alloys condition after prior vacuum infiltration or human osteoblast cells from the hFOB 1.19 (Human ATCC - CRL - 11372) culture line. Findings: The porous material may be used for the non-biodegradable scaffold. After implantation into the body in the form of an implant-scaffold one, it allows the natural cells of the patient to grow into the pores of the implant, and it fuses with the bone or the appropriate tissue over time. The essential part of the implant-scaffold is the porous part inseparably connected with the core of solid materials. Into pores can grow living cells. Research limitations/implications: Biological-engineering composite materials in which natural cells were cultured in the pores in the laboratory next are combined as an artificial material with the natural cells of the patient in his/her body. Practical implications: The hybrid technologies of the all group of those materials were obtained and optimised. Numerous structure research was carried out using the most modern research methods of contemporary materials engineering, and mechanical tests and biological research involving the cultivation of natural cells were realised. Originality/value: The results of the research indicate the accuracy of the idea of implementing a new group of biological-engineering materials and the wide possibilities of their application in regenerative medicine.