About the topic
The 2-D material Graphene is one of the most interesting and promising materials in fundamental and applied science. Its outstanding properties (high charge carrier mobility, exceptional mechanical strength, chemical resistance, etc.) makes it attractive for various applications in areas like high frequency electronic devices, MEMS, optoelectronics, plasmonics, sensors, and photovoltaics, etc.
In applications graphene has in general to be in contact with other materials, be it in the form of electrical contacts, a substrate, or an encapsulation for the purpose of protection and conservation of the device. Thus, the influence of the surrounding materials on the properties of graphene needs to be studied and understood. In this talk I will discuss two different cases, in which the properties of graphene are strongly modified by other materials. First I will discuss the doping of graphene by different materials. I will show you how the electronic structure and morphology of graphene are changing for different types of doping. Secondly, I will also discuss the properties of graphene that are grown on silicon carbide substrates of different orientations. I will show you that both properties and morphology are very different for graphene grown on C-terminated compared to Si-terminated SiC substrates.
The figures show nano-ARPES spectra of different thickness of graphene grown on C-face silicon carbide. The dispersion of the p-bands the stacking of the graphene layers can be determined to be Bernal stacking
About the speaker
Dr. Chariya Jacobi has received her PhD in the field of Semiconductor materials at Linköping University, Sweden in 2004. She specialized in surface and interface properties of clean and oxidized silicon carbide surfaces under the supervision of Prof. Leif Johansson. Afterwards, she worked in the group of Prof. Dr. Ulrich Starke at the Max-Planck-Institute, Stuttgart as a post-doc for 2.5 years and expanded her horizon on surface science techniques. In 2008, she returned to Linköping University and led a group working on graphene on silicon carbide using different surface science tools. In 2009 she became a docent and subsequently she trained 1 post doc and graduated 1 PhD and 2 diploma students. She also lectured one undergraduate course in Condensed Matter Physics (Part I) and one PhD course in Surface Physics.