Point Defects in Ceramics and Semiconductors and Their Roles in Supercapacitor Devices

Giorno 6 settembre 2022, con inizio alle ore 10:30, presso l'Aula I del DFA, su invito del Prof. S. Mirabella, il Prof. Emre Erdem (Sabancı University, Turkey) terrà un seminario dal titolo Point Defects in Ceramics and Semiconductors and Their Roles in Supercapacitor Devices.

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Abstract. Electron paramagnetic resonance (EPR) is a very powerful method due to its enhanced sensitivity to unpaired electrons. In order to understand the defect structure in functional nano-materials we use multi-frequency EPR spectroscopy. In this presentation i) quantum confinement effects in ferroelectric nano-materials and ii) EPR and Photoluminescence (PL) investigations of intrinsic defect centers in semiconductor zinc oxide (ZnO) nanoparticles will be given. Starting with the introductory information about EPR spectroscopy; poling, aging, doping and nano-size effects will be discussed for the ferroelectric materials such as, PbTiO3, BaTiO3, PbZrTiO3 (PZT) etc. In the last part of the talk, surface and core defects and their reactivity under temperature and light will be presented for ZnO semiconductor nano-materials. Defect models will be discussed. Finally application of such materials as electrode materials and their electrochemical performance test results in the real supercapacitor devices will be presented.

 

Defect evolution of non-stoichiometric ZnOThe supercapacitor device based on ZnO and 3D graphene foam electrodes

Figure: (left) Defect evolution of non-stoichiometric ZnO. (right) The supercapacitor device based on ZnO and 3D graphene foam electrodes.

Bio. Emre Erdem is now associate professor at Sabanci University, Materials Science and Nano Engineering program (Istanbul / Turkey). He obtained his BSc degree from Ankara University Physics Department in 1998. In 2001 and 2006, he received his MSc and Ph.D. Degrees from the University of Leipzig Physics Department, respectively. He did postdoctoral research at the Technical University of Darmstadt between the years 2006-2009. In 2010, he became a research group leader in University of Freiburg on the spectroscopic studies of functional nanomaterials and in 2017 he received his habilitation degree in Physical Chemistry. He was awarded LE STUDIUM / Marie Skłodowska-CurieResearch Fellowship (2017), Eugen Grätz Prize (2011) and DAAD scholarship (1999). He (co-)authored more than 100 publications in international journals and more than 50 invited talks in conferences. He is Editor-in-Chief of the journal Experimental Results and Associate Editor in Scientific Reports.

Data: 
Martedì, 6 Settembre, 2022