Now showing items 1-10 of 10

• #### Correlation between Thermal Transport Mechanisms and Microstructure of Epitaxially Grown (Sb1-xBix)2Te3 Thin Films ﻿

(2019-05-23)
This thesis experimentally studies the mechanisms associated with the very low lattice thermal conductivities of the ternary van der Waals layered compound (Sb1-xBix)2Te3. This compound presently constitutes one of the ...
• #### Defektabhängige Transporteigenschaften von Praseodym-Kalzium-Manganat ﻿

(2009-11-24)
Highly correlated electron-systems are characterised by a tight connection between the structure and the transport properties. This work investigates praseodymium calcium magnates (PCMO), ...
• #### Elektrischer Transport und remanentes Widerstandsschalten in $$Pt-Pr_{0.7}Ca_{0.3}MnO_3-Pt$$ Sandwichstrukturen ﻿

(2015-12-07)
This work investigates voltage pulse induced changes in the electrical resistance of praseodymium- calcium- manganite (PCMO). Either chemical or pure structural changes in the PCMO are suggested as possible mechanisms for ...
• #### Hybrid systems of molecular ruthenium catalyst anchored on oxide films for water oxidation: Functionality of the interface ﻿

(2017-11-03)
The scope of the presented thesis is the realization and detailed analysis of a hybrid system for photoelectrochemical watersplitting with La$_{0.6}$Sr$_{0.4}$MnO$_3$ (LSMO) as photoabsorber and immobilized molecular ...
• #### In Situ X-ray Spectroscopy and Environmental TEM Study on Manganite Water Oxidation Catalysts ﻿

(2017-11-29)
This thesis presents in situ studies on the active states of manganite water oxidation catalysts in water vapor. The study in chapter 2 probes the surface electronics of the strongly correlated Pr1-xCaxMnO3 (0
• #### In-situ Environmental Transmission Electron Microscopy Investigation of Perovskite Oxide Thin Films During Electrochemical Oxygen Evolution Reaction. ﻿

(2022-07-21)
Despite many theoretical and experimental efforts to find active catalysts in oxygen evolution reaction (OER), the mechanism for high activity and long-term OER stability remains elusive. Catalyst-electrolyte interface ...
• #### Investigation of the Influence of Correlations on Photovoltaic Energy Conversion in Hot Polaron Solar Cells ﻿

(2022-08-08)
In semiconductor single junction solar cells fundamental limitations are given by the two major intrinsic loss mechanisms: a) inability to absorb photons with energies below the band and b) thermalization of photon energies ...
• #### Künstliche und selbstorganisierte Nanokomposite basierend auf oxidischen Verbindungen ﻿

(2011-10-25)
Due to the large amount of phase and grain boundaries as well as the small length scales, highly efficient transport phenomena and coupling effects may occur in nano composite materials ...
• #### Pr$_{1-x}$Ca$_x$MnO$_x$ for Catalytic Water Splitting - Optical Properties and In Situ ETEM Investigations ﻿

(2015-09-17)
In this thesis, Ca-doped PrMnO$_3$ (PCMO) is evaluated as a catalyst for (photo)electrochemical water oxidation. The investigations are focused on elementary steps of the overall process. First, the optical absorption in ...
• #### Structure and photovoltaic properties of strongly correlated manganite/titanite heterojunctions ﻿

(2018-08-21)
In the present thesis the photovoltaic (PV) effect in strongly correlated manganite/titanite heterostructures is investigated. As a model system thin films of Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ (PCMO) were deposited on single ...