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Inovation of measurement equipment used for analyzing of photovoltaick cells
Otépka, Jakub ; Bača, Petr (referee) ; Vaněk, Jiří (advisor)
This bachelor thesis deals with the design of a tachometer which is used to measure and display of mechanical aperture speed of a measuring equipment for the defect analysis of solar cells using the photoluminescence method. This work is divided into three parts. The first section describes the principle of solar cells, the principle of luminescence radiation and its types. Next the defects of solar cells are analyzed. The second part discusses the theory of tachometers, the principles and methods of loading pulses. The third part is then analyzed the design and construction of the selected type tachometer.
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Effects of ultrasound on biological materials
Peprníčková, Anna ; PhD, Vladan Bernard, (referee) ; Vlk,, Daniel (advisor)
In this bachelor thesis I deal with effects of ultrasound on biological materials. In theoretical part is write up a literature search about effects of ultrasound on bimacromolecules namely deoxyribonucleic acid (DNA), proteins (BSA) and bacterial cells. Effects of ultrasound was investigated practically on genetically modified bacterias of Escherichia coli. These bacterias were sounded by ultrasound by various frequences for the same time and then their viability was measured on luminometer. The results for ever frequency were compared.
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The photoluminescence properties measurement of ultrathin films
Metelka, Ondřej ; Mach, Jindřich (referee) ; Šamořil, Tomáš (advisor)
The thesis briefly describes the principles and types of luminescence. In the first following research of study is also discussed the equipment which is applicable to photoluminescence experiments, including the arrangement. The second research focuses on the influence of the properties of gallium nitride (GaN) (ultra) thin films and other structures prepared by various ways on shape of photoluminescence spectra. The paperwork also describes the further optimization of photoluminescent apparatus used for the measurement of photoluminescence spectrum in the UV light radiation which is located at the Institute of Physical Engineering at the Technical University. The extension of measurements at low temperatures (design and construction of its own cryostat) is added. The conclusion concernes the test measurements to determine the effect of various settings of the apparatus on the resulting measured photoluminescence spectrum.
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Thin Films of Sb2S3 Doped by Sm3+ Ions
Frumarová, Božena ; Bílková, M. ; Frumar, M. ; Repka, M. ; Jedelský, J.
Pure and Sm3+ doped amorphous thin films of Sb2S3 were prepared by thermal co-evaporation of Sb2S3 and Sm metal. From transmittance measurement, the absorption edge, index of refraction, thickness , Eg opt relative permittivity, single oscillator energy and dispersion energy were determined.
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