|
| |
|
|
Optoelektronický senzor polarizačního stavu prošlého světla
Bajgar, Aleš ; Rampl, Ivan (oponent) ; Tománek, Pavel (vedoucí práce)
Biologické tkáně mají rozměr buněk větší než je vlnová délka viditelného světla. Při průchodu světla tkání dochází k Mieovu rozptylu světla a vznikají různé polarizační stavy, které mohou mít vypovídací schopnost o stárnutí vzorků. Změny polarizačního stavu v důsledku mnohonásobného rozptylu světla na biologických buněčných tkáních umožní měřit stárnutí biologické tkáně. Prošlé polarizační světlo vykazuje mnohonásobný rozptyl na tenké vrstvě vzorku.
|
|
|
Non-Destructive Local Diagnostics of Optoelectronic Devices
Sobola, Dinara ; Pína,, Ladislav (oponent) ; Pinčík,, Emil (oponent) ; Tománek, Pavel (vedoucí práce)
To obtain novel materials for emerging optoelectronic devices, deeper insight into their structure is required. To achieve this, the development and application of new diagnostic methods is necessary. To contribute to these goals, this dissertation thesis is concerned with local diagnostics, including non-destructive mechanical, electrical and optical techniques for examining the surface of optoelectronic devices and materials. These techniques allows us to understand and improve the overall efficiency and reliability of optoelectronic device structures, which are generally degraded by defects, absorption, internal reflection and other losses. The main effort of the dissertation work is focused on the study of degradation phenomena, which are most often caused by both global and local heating, resulting in increased diffusion of ions and vacancies in the materials of interest. From a variety of optoelectronic devices, we have chosen two representative devices: a) solar cells - a large p-n junction device, and b) thin films - substrates for micro optoelectronic devices. In both cases we provide their detailed surface characterization. For the solar cells, scanning probe microscopy was chosen as the principal tool for non-destructive characterization of surface properties. This method is described, and both positive and negative aspects of the methods used are explained on the basis of literature review and our own experiments. An opinion on the use of probe microscopy applications to study solar cells is given. For the thin films, two interesting, from the stability point of view, materials were chosen as candidates for heterostructure preparation: sapphire and silicon carbide. The obtained data and image analysis showed a correlation between surface parameters and growth conditions for the heterostructures studied for optoelectronic applications. The thesis substantiates using these prospective materials to improve optoelectronic device performance, stability and reliability.
|
|
|
Perovskite-based optical sensor
Frkáň, Lukáš ; Jandová, Kristýna (oponent) ; Novák, Vítězslav (vedoucí práce)
The aim of this Master´s thesis is to frame the concept of perovskite-based materials, provide basic information about perovskite-based materials and scrutinize their potential in terms of optical sensors manufacturing. The thesis also deals with monitoring of the sample in terms of long-term stability. The analysis of measured characteristics and their properties is included in this semester thesis as well, along with the methodology of testing and evaluating of the results.
|
|
|
Implementation of polycyclic saturated systems in synthesis of advanced organic and hybrid materials for application in organic electronics
Jančík, Ján ; Částková, Klára (oponent) ; Todorov, Petar (oponent) ; Krajčovič, Jozef (vedoucí práce)
Advanced materials in all areas of industry have experienced an extreme boom in recent years due to the constant miniaturization of components and electronics, the creation of smart and functional materials, the development of new therapeutic and diagnostic methods, and finally, the improvement and streamlining of production processes. An important position in this system is in the sector of organic electronics, in which many technological companies and investors see a great future. To prove the flexibility, versatility, and scalability of the advanced materials, completely new adamantyl-substituted polythiophenes were prepared and investigated. As a strong competitors to commercially used materials, the novel polymers show that the field of organic electronics has not reached its borders until now. The wide characterisation and study of the new polymers was provided. To extend the research area, a series of completely new photoswitching molecules based on para-bis(2-thienyl)phenylene were designed, prepared, and investigated as another type of advanced organic materials. Following the actual trends, even perovskite materials were investigated. A completely new, environmentally friendly, low cost, and ease-of-use scalable method was invented and optimized for four mostly used hybrid lead-halide perovskites macro crystals preparation. This method could be the answer for the industrial production of high-quality, defect-free, and symmetrical perovskite macrocrystals. On the other hand, different kinds of perovskite nanoparticles were investigated to improve stability and properties. The basic ligand stabilisation was examined, focusing on adamantyl-based ligands and for improving properties, the stabilisation by polymeric matrix was designed. Adamantyl substituted polythiophenes were used as conductive matrix for perovskite nanoparticles in the form of thin layer stabilisation.
|
|
|
Perovskite-based optical sensor
Frkáň, Lukáš ; Jandová, Kristýna (oponent) ; Novák, Vítězslav (vedoucí práce)
The aim of this Master´s thesis is to frame the concept of perovskite-based materials, provide basic information about perovskite-based materials and scrutinize their potential in terms of optical sensors manufacturing. The thesis also deals with monitoring of the sample in terms of long-term stability. The analysis of measured characteristics and their properties is included in this semester thesis as well, along with the methodology of testing and evaluating of the results.
|
|
| |
|
|
Solární stavebnice a optoelektronické součástky ve výuce fyziky
Burkovec, Václav ; Drozd, Zdeněk (vedoucí práce) ; Kolářová, Růžena (oponent)
V diplomové práci byl vytvořen přehled solárních stavebnic, hraček a dalších prvků dostupných na trhu. S vybranými stavebnicemi byly navrženy experimenty a ty provedeny s žáky ZŠ ve výuce. K práci je přiložen i krátký filmový materiál z průběhu těchto pokusů. Součástí práce je navržení vlastní solární sestavy a kompletní popis její výroby a jejího využití ve výuce fyziky. Dále práce obsahuje popis doprovodné webové stránky. Na stránce jsou k stažení pracovní listy. Ty byly otestovány ve výuce a v práci vyhodnoceny.
|
|
|
Non-Destructive Local Diagnostics of Optoelectronic Devices
Sobola, Dinara ; Pína,, Ladislav (oponent) ; Pinčík,, Emil (oponent) ; Tománek, Pavel (vedoucí práce)
To obtain novel materials for emerging optoelectronic devices, deeper insight into their structure is required. To achieve this, the development and application of new diagnostic methods is necessary. To contribute to these goals, this dissertation thesis is concerned with local diagnostics, including non-destructive mechanical, electrical and optical techniques for examining the surface of optoelectronic devices and materials. These techniques allows us to understand and improve the overall efficiency and reliability of optoelectronic device structures, which are generally degraded by defects, absorption, internal reflection and other losses. The main effort of the dissertation work is focused on the study of degradation phenomena, which are most often caused by both global and local heating, resulting in increased diffusion of ions and vacancies in the materials of interest. From a variety of optoelectronic devices, we have chosen two representative devices: a) solar cells - a large p-n junction device, and b) thin films - substrates for micro optoelectronic devices. In both cases we provide their detailed surface characterization. For the solar cells, scanning probe microscopy was chosen as the principal tool for non-destructive characterization of surface properties. This method is described, and both positive and negative aspects of the methods used are explained on the basis of literature review and our own experiments. An opinion on the use of probe microscopy applications to study solar cells is given. For the thin films, two interesting, from the stability point of view, materials were chosen as candidates for heterostructure preparation: sapphire and silicon carbide. The obtained data and image analysis showed a correlation between surface parameters and growth conditions for the heterostructures studied for optoelectronic applications. The thesis substantiates using these prospective materials to improve optoelectronic device performance, stability and reliability.
|
|
|
Optoelektronický senzor polarizačního stavu prošlého světla
Bajgar, Aleš ; Rampl, Ivan (oponent) ; Tománek, Pavel (vedoucí práce)
Biologické tkáně mají rozměr buněk větší než je vlnová délka viditelného světla. Při průchodu světla tkání dochází k Mieovu rozptylu světla a vznikají různé polarizační stavy, které mohou mít vypovídací schopnost o stárnutí vzorků. Změny polarizačního stavu v důsledku mnohonásobného rozptylu světla na biologických buněčných tkáních umožní měřit stárnutí biologické tkáně. Prošlé polarizační světlo vykazuje mnohonásobný rozptyl na tenké vrstvě vzorku.
|
host ::
RSS.