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Original title in Czech: Fyzikální elektronika a nanotechnologieFEKTAbbreviation: PP-FENAcad. year: 2012/2013
Programme: Electrical Engineering and Communication
Length of Study:
Profile
The objective of the study is to provide PhD education to MSc graduates in all partial fields and to create a cross-disciplinary overview of the present development, to develop theoretical foundations in the selected research area, to master the methods of scientific, to develop their creative abilities and to use them for the solution of research problems. This all should lead to a dissertation thesis, which will provide an original a significant contribution to the research status in the field of interest.
Key learning outcomes
Graduates of this program will acquire cross-disciplinary knowledge of and experience in technical and physical subjects on a high-quality theoretical level. Graduates are for their later independent research and development work equipped with the knowledge and experience from, in particular, physics of semiconductors, quantum electronics and mathematical modeling and will be able to independently solve problems associated with nanotechnologies. Potential job careers: research worker in basic or applied research and in the introduction, implementation and application of new prospective and economically beneficial procedures and processes in the field of electronics, electrical engineering, non-destructive testing and reliability and material analysis.
Occupational profiles of graduates with examples
Graduates of this program will acquire cross-disciplinary knowledge of and experience in technical and physical subjects on a high-quality theoretical level. Graduates are for their later independent research and development work equipped with the knowledge and experience from, in particular, physics of semiconductors, quantum electronics and mathematical modeling and will be able to independently solve problems associated with nanotechnologies. Potential job careers: research worker in basic or applied research and in the introduction, implementation and application of new prospective and economically beneficial procedures and processes in the field of electronics, electrical engineering, non-destructive testing and reliability and material analysis
Guarantor
prof. RNDr. Pavel Tománek, CSc.
Issued topics of Doctoral Study Program
An important role in many plasma processing devices plays the radiative heat transport. The experimental investigation is very difficult, therefore, mathematical modeling is of great imporatnce. The knowledge of absorption properties of the plasma is necessary for succesfulI theoretical modeling. The aim of this disertation work is to collect atomic and molecular data which will serve as input data for calculation of absroption coefficients of selected plasmas. It concerns searching of data in available web databases, their computer processing, and creation of own databases in the form of input files for further calculations.
Supervisor: Bartlová Milada, doc. RNDr., Ph.D.
A large number of inhomogeneities and defects appear in solar cells during their manufacturing due to their large surface area. They reduce quality of cells and cause decrease of their efficiency during operation in solar panels. The aim of the work will be measurement and analysis of these solar cell loss-making mechanisms both at edges and in the volume of samples by monitoring of their activities during electrical or optical excitation. The study will be mainly focused on the characteristics of radiation emitted in the forward and reverse direction during electrical excitation (spectroscopy in the visible region by a CCD camera, infrared spectroscopy, a thermo camera), current fluctuations during voltage loading, local study of surface properties (LBIC, electron microscopy) and other characteristics. The description of different types of loss-making mechanisms in silicon solar cells and their effect on the efficiency of solar cells and panels will be proposed on the basis of this study. The Ph.D. student will cooperate on the research projects SIX (Sensor, Information and Communication Systems) and CEITEC (Central European Institute of Technology).
Supervisor: Koktavý Pavel, prof. Ing., CSc. Ph.D.
Study of energy spectra of nanostructures and nanodevices such as QD and QW and to gain new pieces of knowledge by solving the Schroedinger equation with suitable boundary conditions. The aim is to summarize existing computer procedures and submitt their refined versions. Application of Matlab PDE toolbox and FEM method with help of Comsol Multiphysics is assumed.
Supervisor: Hruška Pavel, doc. RNDr., CSc.
Materials exhibiting high permittivity (dielectric constant, k) are needed for new applications, particularly in integrated circuits (ICs) using the 32 nm technology and in capacitors. In capacitors, high-k dielectrics are used in order to attain higher energy densities in capacitors and thus to reduce the size of capacitors themselves.
Supervisor: Holcman Vladimír, doc. Ing., Ph.D.
The objectives of the work consist in a formulation of physical principle model of electro-ultrasonic spectroscopy and in an analysis of correlation between results of electro-ultrasonic spectroscopy and electromagnetic emission. Special attention will be paid to experimental study of rock samples and ion crystals.
Supervisor: Sedlák Petr, doc. Ing., Ph.D.
Study of structural and optical models of tissues with single and multiple scattering with ordered and randomly distributed scatterers. Study of polarization states of forward and backward scattered light. Data processing by macroscopic and microscopic methods - as Monte Carlo.
Supervisor: Tománek Pavel, prof. RNDr., CSc.
The main problem in the process of the solar cell conversion efficiency and service life improving is to find their basic parameters. A lot of methods exist for this purpose but they often give different results. The goal of the work will be research of advanced modern methods for important parameters finding for example quantum efficiency, minority charge carrier lifetime, impact ionization coefficients or impurities concentration profiles in PN junctions and others. Obtained results will be used for these parameters measuring for some types of solar cells, primarily monocrystalline, polycrystalline and amorphous Si solar cells and CIGS cells. The Ph.D. student will cooperate on the research projects SIX (Sensor, Information and Communication Systems) and CEITEC (Central European Institute of Technology).
Exploatation of electronic noise for the estimation of passive components quality and reliability. The assesment of the correlation between electronic noise level and the results of accelerating ageing tests.
Supervisor: Sedláková Vlasta, doc. Ing., Ph.D.
The thesis focuses on resistive gas sensor and fluctuation processes, which occur as a result of molecule adsorption of detected matter. The aim is to analyze dependencies of these fluctuations on concentrations of detected substances. This analysis can improve selectivity and sensitivity of resistive gas sensors and can optimize a design of gas sensors in order to get a maximal sensitivity.
Radiation energy transfer influences significantly physical processes occuring in the plasma, it plays important role in many devices in plasma processing devices. Electric arc plasmas are utilized in number of industrial applications, e.g. in plasma metallurgy, waste treatment, plasma cutting, welding or spraying. The goal of the work is to solve the equation of radiation transfer by means of the approximate method of discrete ordinates (SN-approximation), to compare the obtained results of radiation energy and radiation flux for selected kinds of plasmas with known results obtained by other approximate methods (method of partial characteristics, diffusion approximation), to discuss availability of different approximate methods.
The aim of this project is to determine parameters of traps in insulation layer of submicron MOSFETs by analysis of its noise characteristics, mainly RTS (random telegraph signal) noise. Experimental work is based on measurement of temperature dependence of noise using helium cryostat and study of amplitude and mean time of capture and emission as a function of electric field intensity and charge carrier concentration in channel. These results will be used to improve generation-recombination model of noise origin and localization of traps.
Supervisor: Pavelka Jan, doc. Mgr., CSc. Ph.D.
Decreasing the dimensions in integrated circuits (currently 32 nm) brings about an increase of interconnect capacitance and thus the reduction of the signal propagation speed. The limiting factor for a further improvement of electronic device performance thus become not the properties of semiconductor devices themselves but rather interconnect delays and, hence, too high magnitudes of parasitic capacitances. One of the options for the reduction of interconnect capacitances is the reduction of the permittivity (dielectric constant, k) of thin-layer insulating layers (capacitance is directly proportional to permitivity). Two major routes are available: replacement of polar Si-O bonds with less polar Si-F or Si-C bonds or raising the porosity (intentional introduction of air voids). The newly developed low-k materials must, however, not limit the currently used silicon technologies and must be able to pass all manufacturing steps (temperatures up to about 1100°C). The work on this topic will require experimental work in sample preparation and design, studies of the theory of low-k dielectrics and the measurement of electrical properties of developed material systems. What is available: measurement equipment for the frequency range 10-3 – 109 Hz and the helium cryostat for the temperature range 10 – 500 K.
Supervisor: Liedermann Karel, doc. Ing., CSc.
The objective of PhD thesis is a study of semicondutor detectors of highenergy radiation constructed on the cadmium-telluride structure. More precive task is an experimental study of charge transport, and simulation of heterostructure junstion semiconductor-metal. Important part of the work long term study od detector behavior, connected with estimation af detector lifetime and reliability. The work also deals with estimation of influence of operating conditions on changes of detector electrical parameters, and ration signal-noise.
Supervisor: Grmela Lubomír, prof. Ing., CSc.
The topic of the dissertation is the investigation of electrical properties of CCTO ceramics (i.e., based on CaCu3Ti4O12), doped with transition metals and lanthanides. Attention will be focused toward the identification of mechanisms leading to high dielectric constant (permittivity) of the order 10^4 – 10@5 and, subsequently, on the modification of CCTO ceramics formulation in order to reduce dielectric loss and to extend the frequency interval, in which the dielectric constant retains its high value, up to the GHz range Materials exhibiting high permittivity are needed for new applications, particularly in integrated circuits and in capacitors. In capacitors, high-k dielectrics are used in order to attain higher energy densities and thus to reduce the size of capacitors themselves. The work on this topic will require experimental work in sample preparation and design, studies of the theory of high -k dielectrics and the measurement of electrical properties of developed material systems. What is available: measurement equipment for the frequency range 10^2 – 10^9 Hz and Janis helium cryostat CCS-400/204 for the temperature range 10 – 500 K. Purchased, yet not operated are Novocontrol ALPHA-AT high-resolution high-frequency analyzer with frequency range 3 microHz – 40 MHz and Nicolet 8700 FTIR-spectrometer with wave number range 20 000 – 350 cm-1.
Micro-cracks creation in mechanical loaded solids is accompanied by origin of electromagnetic (EME) and acoustic (AE) signals. These signals may be used for study of micro-cracks formation evolution, their characteristics finding and their localization. EME and AE methods are usable in electrical engineering, mechanical engineering, civil engineering or in geophysics. The goal will be determination of micro-cracks primary parameters and their localization in concrete, granite and in modern composite materials for structural applications. Analysis of EME and AE signals origin and propagation will be performed in these materials and models will be suggested. The methodology for determination of selected primary parameters and micro-cracks localization will be suggested and verified. The solution of hydraulic press control via PC and realization of automated set-up will be an important part of the work. The Ph.D. student will cooperate on the research project GAČR P104/11/0734 (Utilization of electromagnetic and acoustic emission in research of advanced composite materials for structural applications) and the projects SIX (Sensor, Information and Communication Systems) and CEITEC (Central European Institute of Technology).
Research will be based on literature retrieval of nanostructure (like QD, QW) and surroundings interfaces analyzed. The type of transport across the interface will be specified (to be resonant tunnelling or hopping mechanism or Landauer-type mechanism, etc) and a computer simulation developed. The target will be the I=I(U) curve determination, with the use of material and nanostructure parameters.