β-FeSi2 is a promising material for thermoelectric application, especially if it can be nanostructured to decrease the lattice contribution to the thermal conductivity. It can be even more interesting if the entire chain of processes implemented to obtain it is not too time and energy consuming. In this paper we report a simple route to synthesize ...
Optical pump-probe spectroscopy is a powerful tool for the study of non-equilibrium electronic dynamics and finds wide applications across a range of fields, from physics and chemistry to material science and biology. However, a shortcoming of conventional pump-probe spectroscopy is that photoinduced changes in transmission, reflection and scatteri...
Photocatalytic processes are regarded as a sustainable and environmental-friendly way to attenuate mankind’s strong dependence on fossil fuels, which is the main responsable for high pollution levels in our planet. Metal microporous chalcogenides, due to band structure, bandgap value and highly reduced charge carrier’s residence time within the cry...
Published in International Journal of Materials Research
Some metals share an elusive property with silicon (and other semiconductors): they may exhibit strong self-induced current oscillations during anodic dissolution in electrochemical experiments. While this feature, as well as related features concerning self-organization at reactive solid-liquid interfaces, is still not well understood, the so-call...
In this thesis, I present the study of artificially generated defects by ion irradiation onthe surface of Transition Metal Dichalcogenides (TMDC), more specifically of tungstendisulphide (WS2) and tungsten diselenide (WSe2) crystals. I also present the structuralanalysis of WS2 films grown by Reactive Magnetron Sputtering (RMS) and compare theobser...
Published in Applied Physics A
AbstractThis paper presents the fabrication of large-area four-terminal (4 T) perovskite-Si solar cells. Large-area semi-transparent perovskite solar cells were fabricated by utilizing a thin copper layer as the low-cost transparent electrode. Carrier selective contact (CSC)-based Si solar cell was also fabricated with molybdenum oxide (MoOx) hole ...
Published in Scientific Reports
To improve the manufacturing of vertical GaN devices for power electronics applications, the effects of defects in GaN substrates need to be better understood. Many non-destructive techniques including photoluminescence, Raman spectroscopy and optical profilometry, can be used to detect defects in the substrate and epitaxial layers. Raman spectrosc...
Published in Applied Physics A
In this work, undoped and cobalt-doped cadmium sulfide (CdS) films with different cobalt concentrations were grown on microscopic glass substrates using ultrasonic spray pyrolysis technique at 300 ± 5 °C substrate temperature. The influences of cobalt doping on electrical, optical, structural, and morphological properties of CdS films were studied....
Herein, liquid exfoliation method was employed to prepare metal-free photocatalyst of few-layer phosphorene using black phosphorus as the precursor and its physicochemical properties were systematically characterized. The photocatalytic degradation experiments show that phosphorene exhibits more excellent photocatalytic activity toward tetracycline...
This PhD thesis is devoted to the demonstration of a new area selective deposition process based on the plasma enhanced chemical vapor deposition (PECVD) technique and to understanding the physical origin behind it.The first section of the thesis exploits Ar/SiF4/H2 plasma chemistry to selectively and locally deposit microcrystalline silicon (µc-Si...
