ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarAnton PershinWigner RCP SZFIStructural defects in materials as 
the sources of advanced technologies: a theoretical viewpointTuesday, 3 May 
2022, 10:00, Bldg 1, auditorium,  
https://wigner-hu.zoom.us/j/87511367074?pwd=dE96WUliSHdGTm9obk1uTGJKbUQxQT09  
 Meeting ID: 875 1136 7074  Passcode: 790857Control over the formation of 
defects is vital for many emerging areas of physics, chemistry, and materials 
science, from electronics to catalysis. Although defects generally tend to 
deteriorate the properties of the host material, with a rational design, 
these impurities can play a key role in engineering desirable properties, 
such as a high conductivity via doping or in boosting catalytic activity, 
e.g. for water splitting. Some defects, also known as color centers, result 
in the formation of new states inside the band gap, constituting a platform 
for the practical implementation of quantum bits. This talk will focus on a 
theoretical description of spin defects in advanced materials to design 
devices with improved functionality. More specifically, it will be shown how 
to extend the coherence time of near-surface nitrogen-vacancy centers in 
diamond by varying the type of surface termination. Next, the role of vacancy 
defects in CoNiSe2 for the electrocatalytic water splitting will be discussed 
[1]. Furthermore, it will be demonstrated how Ni-doping improves the electric 
and optical properties of zinc oxide [2]. Finally, surprising effects from a 
coupling of organic molecules to spins localized in nanoparticles will be 
presented [3].1. A. El Jaouhari et al., The Role of Selenium Vacancies in the 
Enhancement of Electrocatalytic Activity of CoNiSe2 for the Oxygen Evolution 
Reaction, Journal of Power Sources 514, 230596 (2021).2. A. El Haimeur et 
al., Reducing P-Type Schottky Contact Barrier in Metal/ZnO Heterostructure 
through Ni-Doping, Applied Surface Science 545, 149023 (2021).3. S. Han et 
al., Lanthanide-Doped Inorganic Nanoparticles Turn Molecular Triplet Excitons 
Bright, Nature 587, 7835 (2020). Minden érdeklődőt szívesen látunk! - 
Everyone is welcome to attend.Róbert Juhászsem-admin AT szfki.hu