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Vacuum technologies for creating thin-film systems
Kuchařík, Jan ; Šafl, Pavel (referee) ; Zatloukal, Miroslav (advisor)
The theoretical part of this theses deals with the formation of thin films by vacuum methods. It is a chemical and physical deposition from the gas phase in vacuum environment. Chemical deposition takes place at elevated temperatures, which accelerate reactions. Physical deposition is most often only condensation of vapors of evaporated material. Physical methods are vacuum evaporation, as well as cathodic, ionic, reactive and magnetron sputtering. The formation of thin layers takes place according to 3 known mechanisms. Substrates must be surface treated before the deposition process. The quality of thin films is examined from several perspectives. The practical part is devoted to the production of a thin-film system of copper and tin on a glass substrate. These layers are separated by three different barrier metals. Subsequently, the prepared samples were exposed to thermal stress and were monitored by electron microscope. Diffusion processes at the thin film interface were compared.
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Preparation of low-dimensional inorganic perovskites
Nedvěd, Matěj ; Dvořák, Petr (referee) ; Musálek, Tomáš (advisor)
This bachelor thesis deals with the perovskite CsPbBr3. The thesis presents properties and different ways of preparing nanostructures of this inorganic perovskite. The emphasis is placed on physical vapor deposition using effusion cells. The experiments carried out to prepare nanocrystals and nanowires and the subsequent analysis of their morphology, composition and optical properties are described. The effect of the electron beam and long-term exposure to air on the optical properties is studied. Also, the concept of an experiment that should result in the replacement of lead in the perovskite structure by tin is presented.
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Thin-film systems
Kuchařík, Jan ; Máca, Josef (referee) ; Zatloukal, Miroslav (advisor)
This bachelor thesis concerns to create of thin films on various types of substrates. In the theoretical parts is an overview of the formation of thin films using several techniques. The thesis contains an overview of substrate cleaning processes before the deposition of layer plates and tools for evaluating their properties. Finally, the masking method is discussed. In the experimental part, the acquaintance with the NP - 12 sputtering device and the production of samples took place. The adhesion of the produced samples was evaluated. Electrolysis of samples with titanium coated followed. Finally, the silicon substrate was masked.
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Fabrication of well defined nanoporous structures with application in membrane sensing
Fabianová, Kateřina ; Édes, Zoltán (referee) ; Sadílek, Jakub (advisor)
Theme of this bachelor thesis is focused on preparation of the metal nanomenhir structures situated in highly oriented matrix of silicon nitride nanopores based plasmonic biosensor. Porous structures were prepared by reactive ion etching of silicon nitride film using electron beam lithography prepared temporary mask as a template. Deposition of metals was handled by evaporation and magnetron sputtering and results was compared. Finally, this work assumes reached results including successful approach of sensor preparation without contamination of surrounding surface by heavy metal ions.
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Preparing of perovskite solar cell
Lunga, Jiří ; Strachala, Dávid (referee) ; Kadlec, Michal (advisor)
The work deals with the theory of preparing perovskite solar cells. How about basic structures and the specific types of training opportunities and reproducibility of results. In the third part describes the complete preparation of the article, which reached the highest efficiency and the procedure for subsequent repetition of the experiment
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