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Study of microdefects in Czochralski silicon
Španělová, Klára ; Cába, Vladislav (referee) ; Másilko, Jiří (advisor)
The bachelor's thesis deals with the study of microdefects in Czochralski silicon in cooperation with the company onsemi Rožnov pod Radhoštěm. The main objectiv is to find knowledge about microdefects in Czochralski silicon and their influence on the properties of semiconductor components. The experimental part deals with the characterization of microdefects in Czochralski silicon ingots doped by B, P and Sb and grown in the company onsemi. Specifically, the measurement of radial resistivity is performance using a four-point probe with subsequent conversion to dopant concentration (according to ASTM F 723-99). The radial and axial distribution of microdefects in Czochralski silicon ingots is evaluated using the precipitation test and the OISF test. The position of the vacant-interstitial interface was also detected as part of microdefect study.
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Characterization of perovskite solar cell materials by transient techniques
Nakládal, Martin ; Zmeškal, Oldřich (referee) ; Novák, Vítězslav (advisor)
This thesis deals with the study of the lifetime of charge carriers in perovskite single crystals. The principle of perovskite solar cells is formulated, their main structures are characterized and the history of the development of perovskite solar cells is summarized, especially in terms of efficiency. The properties of perovskite single crystals with perovskite solar cells are compared. For measurement purposes, transient methods, impedance spectroscopy, load characteristics and the dependence of sensitivity and photocurrent on the wavelength of incident radiation are described. The practical part deals with the method of measuring and evaluating the lifetime of charge carriers in the investigated perovskite single crystals.
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Office building
Výborný, Vojtěch ; Stránská, Zuzana (referee) ; Struhala, Karel (advisor)
This master´s project deals with design of an office building nearly zero energy standard. My master´s project consists of three parts. In the first one I work on technical design of the office building. It is a three-storey building with partial basement. Vertical load-bearing system is partially made from monolithic concrete walls and partially from clay blocks walls. The horizontal load-bearing structures are made of monolithic concrete slab. All roofs are designed as flat roofs. In second part I design all technical equipment in this building. In the last part I compare three types of roof, photovoltaic power plants and evaluate their environmental impact. First type of PV power plant is made by monocrystalline solar cell, second one by polycrystalline solar cell and last one by monocrystalline solar cell with battery system. Environmental impact of these systems is evaluated in Open LCA software. All structures comply with the valid standards and regulations.
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Design of a photovoltaic power plant with battery storage for a family house in area Ústrašice
Wiesner, Lukáš ; Jandová, Kristýna (referee) ; Vaněk, Jiří (advisor)
The master thesis covers the design of a photovoltaic solar power plant for a selected family house in Ústašice in Tábor’s region The theoretical part summarizes the photovoltaic phenomenon, production, and differences of various technologies of photovoltaic panels and different types of battery storages. The project also includes the legislative and subsidy conditions in the Czech Republic related to the PV topic. The practical part of the thesis starts with information about the layout of the family house with an analysis of household consumption data for the last five years. The analysis is followed by the selection of a suitable type of system for photovoltaic water heating. Using multi-criteria analysis, the most suitable solar controller and PV panels are then selected. The proposed system is updated with other necessary components. Finally, a simulation of the system is created in PV*SOL to determine the lighting conditions and to evaluate the economics side of the entire project.
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Study of microdefects in Czochralski silicon
Španělová, Klára ; Cába, Vladislav (referee) ; Másilko, Jiří (advisor)
The bachelor's thesis deals with the study of microdefects in Czochralski silicon in cooperation with the company onsemi Rožnov pod Radhoštěm. The main objectiv is to find knowledge about microdefects in Czochralski silicon and their influence on the properties of semiconductor components. The experimental part deals with the characterization of microdefects in Czochralski silicon ingots doped by B, P and Sb and grown in the company onsemi. Specifically, the measurement of radial resistivity is performance using a four-point probe with subsequent conversion to dopant concentration (according to ASTM F 723-99). The radial and axial distribution of microdefects in Czochralski silicon ingots is evaluated using the precipitation test and the OISF test. The position of the vacant-interstitial interface was also detected as part of microdefect study.
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Growth of single crystals and their basic characterization.
Hanzlíková, Kateřina ; Pospíšil, Jiří (advisor) ; Matěj, Zdeněk (referee)
Basic methods of single crystals growth have been studied in this bachelor thesis. The preparation of anatase and ruby single crystals has been realized by floating zone method in different compositions of the surrounding atmosphere. Crystallinity of prepared materials has been verified by Laue method. The same method has been used for orientation of the prepared single crystals along the principal crystallographic axes. The tetragonal structure of TiO2 has been proved by powder X-ray diffraction. The floating zone method has been found as a very suitable and effective method to grow anatase single crystals.
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Office building
Výborný, Vojtěch ; Stránská, Zuzana (referee) ; Struhala, Karel (advisor)
This master´s project deals with design of an office building nearly zero energy standard. My master´s project consists of three parts. In the first one I work on technical design of the office building. It is a three-storey building with partial basement. Vertical load-bearing system is partially made from monolithic concrete walls and partially from clay blocks walls. The horizontal load-bearing structures are made of monolithic concrete slab. All roofs are designed as flat roofs. In second part I design all technical equipment in this building. In the last part I compare three types of roof, photovoltaic power plants and evaluate their environmental impact. First type of PV power plant is made by monocrystalline solar cell, second one by polycrystalline solar cell and last one by monocrystalline solar cell with battery system. Environmental impact of these systems is evaluated in Open LCA software. All structures comply with the valid standards and regulations.
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Growth of single crystals in material research
Bendová, Anežka ; Pospíšil, Jiří (advisor) ; Vališka, Michal (referee)
Title: Growth of single crystals in material research Author: Anežka Bendová Department: Department of Condensed Matter Physics Supervisor of the bachelor thesis: RNDr. Jiří Pospíšil, Ph.D., Department of Condensed Matter Physics Abstract: The subject of this bachelor thesis was a comparative study of single crystal growth methods. The growth of single crystal materials of various classes was tested by multiple methods, especially by growth from supersaturated solution, Bridgman method, Czochralski method and Floating Zone method. Properties and parameters of various techniques were tested and optimized for achieving the highest possible quality of single crystals which parameters were tested by electron microscopy and X-ray diffraction techniques. Suitability and limitations of each method are discussed from the point of size, crystallinity, chemical composition of obtained single crystals and from workload and complexity of the instrumentation. Keywords: Single crystal, Flux, Bridgman method, Czochralski method, Floating Zone method
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Characterization of perovskite solar cell materials by transient techniques
Nakládal, Martin ; Zmeškal, Oldřich (referee) ; Novák, Vítězslav (advisor)
This thesis deals with the study of the lifetime of charge carriers in perovskite single crystals. The principle of perovskite solar cells is formulated, their main structures are characterized and the history of the development of perovskite solar cells is summarized, especially in terms of efficiency. The properties of perovskite single crystals with perovskite solar cells are compared. For measurement purposes, transient methods, impedance spectroscopy, load characteristics and the dependence of sensitivity and photocurrent on the wavelength of incident radiation are described. The practical part deals with the method of measuring and evaluating the lifetime of charge carriers in the investigated perovskite single crystals.
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Growth of single crystals and their basic characterization.
Hanzlíková, Kateřina ; Pospíšil, Jiří (advisor) ; Matěj, Zdeněk (referee)
Basic methods of single crystals growth have been studied in this bachelor thesis. The preparation of anatase and ruby single crystals has been realized by floating zone method in different compositions of the surrounding atmosphere. Crystallinity of prepared materials has been verified by Laue method. The same method has been used for orientation of the prepared single crystals along the principal crystallographic axes. The tetragonal structure of TiO2 has been proved by powder X-ray diffraction. The floating zone method has been found as a very suitable and effective method to grow anatase single crystals.
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