Description
Individual ESR Posters
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Optical Parametric Chirped-Pulse Amplifiers (OPCPAs) are tunable femtosecond sources widely employed for spectroscopy and high-field physics, for instance to generate attosecond pulses. A key property of such sources is the ability to produce, to some extent, pulses with a stable shot-to-shot Carrier Envelope Phase (CEP). This property is mandatory for most of the experiments involving highly...
Perovskites have become a popular material system for fabricating photovoltaics and various optoelectronic devices. Different variations of solution-processing by spin-coating have been investigated over the years. However, perovskites can also be deposited by thermal evaporation. This technique offers the unique possibility to accurately control the deposition of smooth and uniform...
Photoelectrochemical (PEC) water splitting is an auspicious approach to convert solar energy directly into fuel. Hitherto, TiO$_2$, WO$_3$, and α-Fe$_2$O$_3$ have been the most studied metal oxides as photoelectrodes. However, their large bandgap and extremely short charge carrier diffusion lengths are hurdles to attain higher solar-to-hydrogen conversion efficiencies. Recently, copper...
Pull-push chromophores have the donor acceptor structure where it promotes electrons transfer from electron-rich donor group to electron-deficient acceptor group. It can be linked together by chains of different structures and length such as π-conjugated polyene, which are prototypical systems for intramolecular electron transfer processes. Understanding the dynamics of ultrafast charge...
Promotion of carriers to different points in k-space provides the basis for a new family of devices, where the excitation between specific valley states can be used as a switch to perform logic operations, exceeding the limits of conventional electronics for novel technologies.
With advances in stability and control of ultrashort laser pulses, several all-optical approaches to induce valley...
The process of High-Harmonic Generation (HHG) emits a sequence of short bursts of radiation, which are coherently driven by the generation laser, where emission events occur during each laser half cycle. Each of these short bursts is in the attosecond regime and their interference leads to the observation of odd harmonics. These attosecond pulse trains (APTs), unlike isolated pulses, are...
Electronic correlations in inner-shell ionized molecules can be probed via Auger spectroscopy. After a high-energy photon ionizes the atomic core shell close to ionization threshold, a slow photoelectron leaves the atom, not without interacting with the ionic field. Decay may take place via emission of an Auger electron, with which the photoelectron may interact. This Coulombic interaction...
Pump-Probe experiments have become routinely employed tools in the field of spectroscopy, because they give the possibility to reach the time-resolution necessary to unravel dynamics of chemical reactions and physical processes. The goal of my PhD project will be that of investigating such kind of phenomena taking advantage of the radiation provided by FERMI, the free electron laser located in...
Two-dimensional (2D) Hexagonal Boron Nitride (h-BN) is an insulator that has a polar covalent B-N bond. Both monolayer and bilayer (h-BN) emerge as an optoelectronic material, which can be used as photodetectors and for photocatalysis. Here in, we performed calculation for Transient absorption spectroscopy (TAS) for monolayer (h-BN) using a low intensity laser pulse, modelling the dynamics...
The theoretical characterization of the time-resolved X-ray spectra in solution requires simulation of the correlated electronic and nuclear motion with the help of advanced electronic structure methods. The goal behind this work is to use different quantum mechanical techniques to provide a realistic depiction of the coupled electronic and nuclear dynamics. For an instance, ab initio...
The development of technology in materials science, for instance, semiconductors technology, nowadays requires a deep understanding of the characteristics of materials with unprecedented temporal and spatial resolution. A possible experimental approach for gaining this knowledge is near-edge X-ray absorption fine structure (NEXAFS).
My Ph.D. project aims to further the research on the...
The main aim of this project concerns the epitaxial growth of 2D layered transition-metal dichalcogenides (TMCs) and their structural and electronic characterization by means of in-situ scanning tunneling microscopy (STM), reflection high-energy electron diffraction (RHEED), X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission spectroscopy (ARPES). Among other 2D TMCs, three...
Hydrogen production through solar water splitting is a clean solution to the actual energy demand. It can be carried out in a photoelectrochemical cell where a photoelectrode absorbs sunlight producing electron-hole pairs, then the charge carriers are collected separately to oxidize oxygen and reduce hydrogen from water. Several materials have been proposed and tested as photoelectrodes, being...
With rapid technological developments in the last twenty years, semiconductors’ functionality in various applications has led the scientific community to intensive study of perovskites. In particular, the focus is on halide perovskites, since they display an attractive set of properties for radiation detection devices, solar cells and photovoltaic systems.
As such, my PhD project will focus...
The theoretical characterization of the time-resolved X-ray spectra in solution requires simulation of the correlated electronic and nuclear motion with the help of advanced electronic structure methods. The goal behind this work is to use different quantum mechanical techniques to provide a realistic depiction of the coupled electronic and nuclear dynamics. For an instance, ab initio...
