Nanostructured Semiconductors

Konstantinos Termentzidis is a CNRS researcher and he works at the LEMTA laboratory, at the University of Lorraine, France since 2012. He started his studies at the Aristotle University of Thessaloniki (Physics Departement and Master Material’s Physics and Technology), and he obtained his PhD at the University of Vienna, at the Computational Material Science group. He worked as a postdoc fellow at INSA of Lyon and at the Ecole Centrale Paris. His main scientific interest is the theoretical and computational nanoscale heat transport. During, the last 8 years he is studying the phonon transport at nanowires, nanotubes and superlattices with molecular dynamics, with an important publication production in the domain. The nanoscale heat transfer is a crucial issue for a large scope of contexts and applications as biology, medicine, aerospace, communications, electronics and energy. The behavior, reliability, life and cost of these devices depend on the way the system releases heat. As experimental studies are not always available or suitable at this scale, dedicated models and simulations tools are necessary. Termentzidis with his work elucidated the interaction of phonons with interfaces, defects and surfaces at the nanoscale, a key point to design materials with tailored properties and systems with controlled behavior.

THEORY-SIMULATIONS. Structural properties crystalline vs. amorphous phase. Thermal conductivity of disordered systems. Nanostructures and heat transport. Applications. Monte Carlo resolution of the Boltzmann Transport Equation. Equilibrium molecular dynamics. Non-equilibrium molecular dynamics. Approach to equilibrium molecular dynamics. Atomistic simulations of vibrational modes of crystalline nanoinclusions in an amorphous matrix. Structural properties and defects in III-Nitrides at the nanoscale. FABRICATION AND MEASUREMENT TECHNIQUES. Amorphisation of porous silicon nanostructures by heavy ion irradiation. Crystalline/amorphous porous Ge nanostructures by electrochemical etching. Thermal transport in amorphous/nanocrystalline composites. Ball Milling induced nano-crystallization and amorphisation. Physical vapor deposition and tin-induced or laser crystallization. Nanoparticle formation via magnetron sputtering with inert gas aggregation. Scanning thermal microscopy. Thermal wave methods. X-rays and neutrons spectroscopy for the investigation of individual phonons properties in crystalline and amorphous solids.