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Optical characterization of advanced nanomaterials with a high lateral resolution
Liška, Petr ; Münz, Filip (referee) ; Dvořák, Petr (advisor)
Advanced nanomaterials show a significant improvement in certain physical or functional properties compared to conventional materials. Such advanced materials are, for example, lead halide perovskites (LHP). It is a group of hybrid organic-inorganic materials with a direct bandgap exhibiting unique optical properties. The high quantum efficiency of photoluminescence makes nanocrystals or thin films of LHP suitable candidates for the production of light-emitting diodes, solar cells and LCD displays. Their inexpensive and simple fabrication together with their unique optical properties makes LHP one of the most developed materials of the last decade. This diploma thesis aims to study the optical properties of CsPbBr3 perovskite nanocrystals using high lateral resolution methods. CsPbBr3 perovskite nanocrystals show intense anti-Stokes photoluminescence. These nanocrystals can emit light with a lower wavelength than that of the light that causes their photoluminescence. The nanocrystals are prepared in two different ways: by evaporation or by crystallization of the precursor in a solution of dimethylformamide. The morphology, photoluminescence properties and chemical composition of individual nanocrystals are studied. Each nanocrystal is studied individually and its size, shape, photoluminescence properties and chemical compounds are determined, which leads to a deeper understanding of the anti-Stokes photoluminescence of perovskite nanocrystals.
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Optical characterization of perovskite via time-resolved spectroscopy
Schlor, Michal ; Kejík, Lukáš (referee) ; Dvořák, Petr (advisor)
This bachelor’s thesis deals with experimental optical characterization of modern organic-anorganic perovskites, which are promised to improve the technology of photovoltaic cells for solar panels soon. Photovoltaic cells based upon these materials bring not only higher efficiency of solar panels, but also relatively simple and cheap manufacture. The first part of this thesis consists of basic structural qualities of perovskites as well as an overview of spectroscopic methods used to examine the properties of perovskites, especially their strong narrow–band photoluminiscence. The second part consists of characterizations of MAPbBr3, FAPbBr3 and MAPbI3 samples based on their photoluminiscence properties.
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Optical characterization of perovskite via time-resolved spectroscopy
Schlor, Michal ; Kejík, Lukáš (referee) ; Dvořák, Petr (advisor)
This bachelor’s thesis deals with experimental optical characterization of modern organic-anorganic perovskites, which are promised to improve the technology of photovoltaic cells for solar panels soon. Photovoltaic cells based upon these materials bring not only higher efficiency of solar panels, but also relatively simple and cheap manufacture. The first part of this thesis consists of basic structural qualities of perovskites as well as an overview of spectroscopic methods used to examine the properties of perovskites, especially their strong narrow–band photoluminiscence. The second part consists of characterizations of MAPbBr3, FAPbBr3 and MAPbI3 samples based on their photoluminiscence properties.
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Optical characterization of advanced nanomaterials with a high lateral resolution
Liška, Petr ; Münz, Filip (referee) ; Dvořák, Petr (advisor)
Advanced nanomaterials show a significant improvement in certain physical or functional properties compared to conventional materials. Such advanced materials are, for example, lead halide perovskites (LHP). It is a group of hybrid organic-inorganic materials with a direct bandgap exhibiting unique optical properties. The high quantum efficiency of photoluminescence makes nanocrystals or thin films of LHP suitable candidates for the production of light-emitting diodes, solar cells and LCD displays. Their inexpensive and simple fabrication together with their unique optical properties makes LHP one of the most developed materials of the last decade. This diploma thesis aims to study the optical properties of CsPbBr3 perovskite nanocrystals using high lateral resolution methods. CsPbBr3 perovskite nanocrystals show intense anti-Stokes photoluminescence. These nanocrystals can emit light with a lower wavelength than that of the light that causes their photoluminescence. The nanocrystals are prepared in two different ways: by evaporation or by crystallization of the precursor in a solution of dimethylformamide. The morphology, photoluminescence properties and chemical composition of individual nanocrystals are studied. Each nanocrystal is studied individually and its size, shape, photoluminescence properties and chemical compounds are determined, which leads to a deeper understanding of the anti-Stokes photoluminescence of perovskite nanocrystals.
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