Number of found documents: 78
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Energy and Economic Efficiency
Bemš, Július
2017 - English
Available in digital repository of ČVUT.
Energy and Economic Efficiency

Bemš, Július
České vysoké učení technické v Praze, 2017

Spectroscopy of the optical absorption edge of solar cell materials
Holovský, Jakub
2017 - English
The focus of this thesis is relatively narrowly defined as spectroscopy of the optical absorption edge of the actual or potential photovoltaic materials. This includes the spectroscopy methods and interpretation of results, the photovoltaic materials and their technological parameters and also the potential of certain photovoltaic technologies as a renewable source of energy. The materials presented here are either absorbers: amorphous silicon (a-Si:H), microcrystalline silicon, organo-metalhalide perovskites (CH3NH3PbI3) or materials for transparent electrodes: graphene, amorphous InZnO and amorphous ZnSnO. The physical effects studied are related to material preparation methods, ageing, exposure to light, and annealing. The methods employed here for the absorption spectroscopy are photothermal deflection spectroscopy and photocurrent spectroscopy. The two methods are briefly explained and compared. Two main issues related to correct interpretation of these measurements are discussed: effect of surface states and the effects of light scattering. The absorption spectrum in sub-bandgap region is measured to obtain mainly the slope of the absorption edge parametrized by Urbach energy. It is shown here, how theoretically and practically this parameter correlates with the maximum attainable efficiency of solar cell – if the material is used as absorber. If the material is used as transparent electrode, correlation with conductivity is found. The effect of cost evolution in the photovoltaic industry is discussed with the consequence on the efficiency as a most critical parameter dictating the cost of energy. The competitiveness of the solar energy is reviewed for different levels of autonomy. Keywords: solar cells; photovoltaics; photocurrent spectroscopy; photothermal spectroscopy; Urbach energy; sub-bandgap absorption Available in digital repository of ČVUT.
Spectroscopy of the optical absorption edge of solar cell materials

The focus of this thesis is relatively narrowly defined as spectroscopy of the optical absorption edge of the actual or potential photovoltaic materials. This includes the spectroscopy methods and ...

Holovský, Jakub
České vysoké učení technické v Praze, 2017

Analysis of Heterogeneous Biomedical Data
Novák, Daniel
2016 - English
Available in digital repository of ČVUT.
Analysis of Heterogeneous Biomedical Data

Novák, Daniel
České vysoké učení technické v Praze, 2016

Development of alkali activated concrete for practical application
Bílek, Vlastimil
2016 - English
Available to registered users in the VŠB-TUO
Development of alkali activated concrete for practical application

Bílek, Vlastimil
Vysoká škola báňská - Technická univerzita Ostrava, 2016

Selected problems of wave of strong discontinuity in Murnaghan material
Major, Maciej
2015 - English
Available to registered users in the VŠB-TUO
Selected problems of wave of strong discontinuity in Murnaghan material

Major, Maciej
Vysoká škola báňská - Technická univerzita Ostrava, 2015

Paleobiography of the miocene bryozoa
Zágoršek, Kamil
2015 - English
Available to registered users in the VŠB-TUO
Paleobiography of the miocene bryozoa

Zágoršek, Kamil
Vysoká škola báňská - Technická univerzita Ostrava, 2015

Benefits of using silicates as components of nanocomposite materials
Tokarský, Jonáš
2015 - English
Available to registered users in the VŠB-TUO
Benefits of using silicates as components of nanocomposite materials

Tokarský, Jonáš
Vysoká škola báňská - Technická univerzita Ostrava, 2015

Flashover performance investigation of polluted and ice covered insulators exposed to the transient overvoltages
Prochazka, Radek
2015 - English
Available in digital repository of ČVUT.
Flashover performance investigation of polluted and ice covered insulators exposed to the transient overvoltages

Prochazka, Radek
České vysoké učení technické v Praze, 2015

Habilitační práce
Zimmermann, Karel
2015 - English
Available in digital repository of ČVUT.
Habilitační práce

Zimmermann, Karel
České vysoké učení technické v Praze, 2015

Approximate Inference in Graphical Models
Werner, Tomáš
2014 - English
Available in digital repository of ČVUT.
Approximate Inference in Graphical Models

Werner, Tomáš
České vysoké učení technické v Praze, 2014

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