|
|
Renewable Energy Source
Fojtíková, Marcela ; Škvařil, Jan (referee) ; Fiedler, Jan (advisor)
This bachelor thesis is concerned with the usage of renewable power sources. It sheds light on the matter of solar energy, function of photovoltaic cells and photovoltaic panels. It presents us with a closer look on the photovoltaic power plant in Syrovice and essential technological equipment of such facility.
|
|
|
Study of electrical and dielectric properties of thin polymer films
Miklíková, Zdeňka ; Novák, Vítězslav (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 glass substrate, which consist of a thin active layer of mixture ZnPc/PCBM with Al or Au contact. On the selected samples were first measured current-voltage characteristics in the dark and during the exposure then on the selected samples were measured frequency dependences (impedance spectra) in the dark and finally on the selected samples were measured relaxation characteristics (transient response analysis – current dependences on time at constant voltage) in the dark. The measured data for transient measurement were evaluated using the methods of fractal analysis in HarFA. The results will be used to optimize the properties of photovoltaic cells.
|
|
|
Pi-conjugated molecules exhibiting singlet fission
Sahuľ, Martin ; Kratochvíl, Matouš (referee) ; Vala, Martin (advisor)
This bachelor thesis focuses on characterisation of novel materials designed for use in future generation of photovoltaic cells. Examined materials were derivates of diketopyrollopyroles, in which the process of singlet fission was confirmed. Using fluorescence reference standards, the correctness of research methodology was confirmed. Measurements of basic optical and fluorescence characteristics such as absorption, excitation and emission spectra, wavelengths of their respective maximum values and quantum yields were made. Since the studied materials only differed in the number of bromine atoms, the effect of bromation on the properties of molecules was discussed from the acquired values. It was found, that substituted bromine atoms increase the excitation and emission wavelengths of diketopyrollopyroles, therefore decreasing the energy needed to excite the molecule. Next, a new method using fluorescence measurements in a magnetic field that can be used for a quick analysis of singlet fission was developed. Measurements made using this method confirmed the occurrence of singlet fission in rubrene as well as in studied materials. Performed measurements gathered new useful information for the design of new molecules and further improvement of the developed method.
|
|
|
Pi-conjugated molecules exhibiting singlet fission
Sahuľ, Martin ; Kratochvíl, Matouš (referee) ; Vala, Martin (advisor)
This bachelor thesis focuses on characterisation of novel materials designed for use in future generation of photovoltaic cells. Examined materials were derivates of diketopyrollopyroles, in which the process of singlet fission was confirmed. Using fluorescence reference standards, the correctness of research methodology was confirmed. Measurements of basic optical and fluorescence characteristics such as absorption, excitation and emission spectra, wavelengths of their respective maximum values and quantum yields were made. Since the studied materials only differed in the number of bromine atoms, the effect of bromation on the properties of molecules was discussed from the acquired values. It was found, that substituted bromine atoms increase the excitation and emission wavelengths of diketopyrollopyroles, therefore decreasing the energy needed to excite the molecule. Next, a new method using fluorescence measurements in a magnetic field that can be used for a quick analysis of singlet fission was developed. Measurements made using this method confirmed the occurrence of singlet fission in rubrene as well as in studied materials. Performed measurements gathered new useful information for the design of new molecules and further improvement of the developed method.
|
|
|
House energy solutions using renewable energy sources
Sabo, Martin ; Musilová, Petra (referee) ; Poláčik, Ján (advisor)
This bachelor thesis discusses the role of renewable sources of energy in energetics of a family house and technologies providing this possibility. Special care is given to power production, heating and air conditioning. The issue of low-energy and passive houses is described in the beginning of the thesis, leading to acknowledgement with different types of energy sources. Analytic part of the thesis contains general information about ways of heating and power production using renewable sources of energy. Different ways of ventilation are introduced and suitability of specific technologies assessed. The practical part describes design of ventilation and heating unit in an experimental house.
|
|
|
The Effect Of Pid On Photovoltaic Cells
Strachala, Dávid ; Hylský, Josef
This work deals with the Potential-Induced Degradation (PID) of the silicon photovoltaic modules and cells (PID shortly). The cause of PID degradation is in a migration of positive sodium ions from the protective glass, which was confirmed by the electroluminiscence measurements. The sodium drifts was locally supported by the increasing of the PV module temperature up to 80 °C. Based on the observation, a modification of the photovoltaic structure was added. The new solar cells shows good resisitive properties against PID.
|
|
|
Study of Optical Properties and Interference Phenomena on Thin Films of Organic Mcaterials
Schmiedová, Veronika ; Čeppan, Michal (referee) ; Mistrík, Jan (referee) ; Zmeškal, Oldřich (advisor)
Ph.D. thesis is focused on the study and determination of layer thickness and optical properties, such as the dispersion dependence of the refractive index of various materials prepared in the form of thin layer. In the first part of this work the theoretical findings in the field of spectroscopic ellipsometry are summarised. These findings are followed by the description and characterization of the light polarization, evaluation of experimental data and determination of the physical properties of studied materials. Experimental and result section of this work is devoted to the preparation and characterization of thin films of the studied materials: titanum dioxide (TiO2), new organic materials (MDMO-PPV, PCDTBT, PCBTDPP, PC60BM, PC70BM) and reduced graphene oxide (rGO). These were all selected with respect to their potential use in the organic photovoltaics.
|
|
| |
|
|
Possibility of using alternative decentralized energy sources
Pitron, Jiří ; Pěcha, Jiří (referee) ; Mastný, Petr (advisor)
The thesis concerns of the possibility by using alternative decentralized sources of energy. The first chapter describes current energy situation in the Czech Republic and consideration of future electrical energy consumption and the coverage by the renewable sources. Another part of this chapter describes each types of renewable energy with their advantages and disadvantages related to the Czech Republic. In the second chapter are introduced inputs which are appropriate for the plan of energetic system. The following theoretical chapter deals with each types of alternative energy sources using renewable source including the possibility of the installation and plan for the building. These alternative sources are sorted out by the way of using renewable sources of energy. The theoretical-practical fourth chapter concerns of the heating by the heat pump. For the detailed description was chosen the heat pump which is currently denote as appropriate alternative source of heat in household. With appropriate plan, which the thesis deals with, is this alternative source considered as proper investment. In the last chapter was assembled programme for creating models of energetic flux and calculation for the plan of heating by the heating pump air/water. This model is taken for concrete buildings related to exact outdoor temperature from previous years in concrete locality. In the end was realized validation of the software with the real measurement in concrete building.
|
|
|
Modeling of solar power station parameters in GIS
Kučera, Josef ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
The work deals with the modeling of the parameters of solar power plants and the issue of solar energy with its use in the photovoltaic power plants. It uses the geographic information system named ArcGIS. In the beginning of the work, there is the theory. This theory is necessary to understanding the function of the photovoltaic cells, from the beginning to the photovoltaic panels construction. There were analyzed the conditions of the location of the photovoltaic panels in the Czech Republic. Furthermore, the work approaches the ArcGIS and its 3D modeling possibilities. The part of the work deals with the proposal for the selection process of the most suitable location to the photovoltaic panels installing. The main part of the work is the visualization of the 3D models of the locations of interest.
|
guest ::
