|
|
Analysis of a-SiOC:H films by selected spectroscopic techniques
Ondreáš, František ; Zmeškal, Oldřich (referee) ; Čech, Vladimír (advisor)
This bachelor thesis deals with preparation of thin plasma polymer films on the basis of tetravinylsilane by plasma-enhanced chemical vapour deposition and film characterization by selected spectroscopic techniques. The theoretical part is a background research about plasma chemistry and spectroscopic methods of characterisation of thin plasma polymer films. The practical part consisted of preparation of two series of samples and their characterization. Prepared thin plasma polymer films were characterized by selected spectroscopic techniques. Thickness and optical constants were determined by spectroscopic elipsometry. Chemical structure was characterized by infrared spectroscopy. The results indicate the possibility of managing physico-chemical properties of thin plasma polymer films on the basis of tetravinylsilane by deposition conditions and thus possibility of preparation materials tailored to a variety of applications.
|
|
| |
|
|
Study of influence degradation to fotovoltaic cells properties
Tulková, Tereza ; Sládek, Petr (referee) ; Zmeškal, Oldřich (advisor)
The thesis examines degradation of photovoltaic cells and modules. Degradation assessment was based on the data gathered from the photovoltaic system installed at the Pedagogical Faculty of Masaryk University in Brno, Poříčí 31. The research focuses on influence of external factors on the amount of power supplied to the grid by the system. Theoretical part of the thesis summarizes state-of-the-art knowledge about photovoltaic conversion and devices taking the advantage of the principle. The first part of the thesis describes production and application of photovoltaic cells and their impact on the environment. Second part of the thesis deals with the principle of photovoltaic conversion. Next part lists materials used for the production of photovoltaic cells and the process of encapsulation. The fourth part summarizes knowledge about degradation of photovoltaic panels. Experimental part of the thesis statistically analysis the data gathered from the above mentioned power plant. Influence of degradation factors (surface temperature of PV panel, air temperature, wind velocity and radiation intensity) on effectiveness of energy conversion was examined in particular. The published results can be applied on analysis of new projects and/or used for modification of production technological processes.
|
|
|
Study of thin transparent films properties
Schmiedová, Veronika ; Veselý, Michal (referee) ; Zmeškal, Oldřich (advisor)
The main aim of this bachelor´s thesis is a study of thin transparent layers of organic materials (PPV, P3HT, TiO2, DPP). The theoretical part describe the methods of quality examinations of their surface, mostly the use of optical and interference microscopy. For elaboration of data was used the image analysis via HarFA program. Thickness of layer and the index of refraction was provided by interference microscope. From the interference images was identified the amplitude of groove for various values of treshold, but mainly the interface inhomogenity of groove, which proofs the surface inhomogenity of samples. For the images taken by the optical microscope were allocated the average errors (but also errors of superior sorts) defining the surface inhomogenities of samples. The conlusion of this study compare the results of both methods.
|
|
| |
|
|
Study of thin films refractive index by interference microscopy
Procházka, Petr ; Veselý, Michal (referee) ; Zmeškal, Oldřich (advisor)
This bachelor thesis is focused to measure of spectral dependences of refractive index in thin layers. The object of this thesis was measurement of dispersion dependences of refractive index. The theoretical part deals with present methods of refractive index measurements and quantities associated with. These methods were ordered from the easiest to the most complex methods. Intention of own work was reached results by the very easy method of interference mi-croscopy. Thin layers of various organic matters were investigated by optical microscope and main-ly by interference microscope to determine their optical attributes – refractive index and his dis-persion dependences. There were images, which were made by interference microscope and digital camera. These images were subjected to image analysis by computer program HarFA. Dispersion dependences of refractive index were proved by elaboration by this computer pro-gram.
|
|
|
Study of electrical properties of thin polymer films
Pospíšil, Jan ; Vala, Martin (referee) ; Zmeškal, Oldřich (advisor)
The thesis is focused on the study of electric and dielectric properties of thin-film organic materials that can be used as an active layer of photovoltaic cells. Primarily were studied the properties of the layers on the PET or glass substrate, which consist of a thin active layer of polymethylphenylsilane (PMPSi) or derivatives of diketopyrrolpyrrole (DPP). On a selected sample were first measured current-voltage characteristics and current dependences on time at constant voltage (relaxation characteristics). Finally were measured frequency dependences (impedance spectra) and their relaxation characteristics too. The measured data were evaluated using the methods of fractal analysis in HarFA. The results will be used to optimize the properties of photovoltaic cells.
|
|
|
Wind power plant in area North Moravia
Pasírbková, Adéla ; Zmeškal, Oldřich (referee) ; Kotlík, Josef (advisor)
This thesis deals with analysis of wind parks from aspect of EIA, the annual capacity factor and the economy of operation. It shows the utilization of wind power in wind plants, wind potential of the Czech Republic and criteria for selection locations for construction wind plant. It describes the Act No. 100/2001 Coll., on environmental impact assessment, in which is the EIA process regulated. It analyses potential and real possibilities of wind power utilization in the North Moravian Region in connection with the Territorial Energy Policy.
|
|
|
Photovoltaic power station in area South Moravia, appreciation their influence on environment
Krystýnová, Hana ; Zmeškal, Oldřich (referee) ; Kotlík, Josef (advisor)
This thesis is focused on possible utilization of the sun energy for electricity production. It points out the basic components, attributes and functions of the photovoltaic system, also the suitability of the South-Moravian region for photovoltaic power station construction. Further there are mentioned current photovoltaic power stations built in South-Moravian from the point of view of location, performance etc. It analyses potential and real possibilities of solar power utilization in the South Moravian Region in connection with the Territorial Energy Policy.
|
|
|
Study of thermal properties of materials for solar cells lamination
Dohnalová, Lenka ; Matiašovský, Peter (referee) ; Zmeškal, Oldřich (advisor)
The topic of presented bachelor´s thesis was study of thermal properties of materials for solar cells lamination. The main goal of this thesis was measuring and characterisation of the basic thermal properties of volume materials and plastic films, which are used to solar cells lamination. At first a thermal response to a concrete thermal pulse was measured by the thermoelectric thermometer. Then there was studied the distribution of temperature on the surface of a sample during heating and cooling by the non-point heat source. At the beggining of this thesis it was needed to define heat and ways it´s spread, then the basic thermal properties and also methods of their determination. The ways of measuring temperature were described and then used in praxis. My thesis deals with study of thermal properties volume materials. It was needed to characterize measured volume material and define it´s thermal parameters, because the values of thermal parameters of measured samples of lamination films were compared to these values. This thesis is concerned in solar cells too. So there were also described their structure, properties, utilization and way of their production. After the definition of all needed therms the experimental part of this thesis was begun. At first the thermal response of each of the eight different samples was measured by the pulse transient method. Then there was studied the thermal field on the surface of the sample by thermocamera through using the pulse transient method. Findings of both methods were finally compared.
|
guest ::
