Doping of Semiconducting Graphene Nanomesh

Datum

04.09.2017

Zeit

13:30 - 14:30

Sprecher

Mohamed Eldeeb

Zugehörigkeit

Department of Physics, Cairo University,

Sprache

en

Hauptthema

Materialien

Andere Themen

Materialien, Physik

Host

Grit Rötzer

Beschreibung

Porous graphene structures, also termed graphene nanomeshes (GNMs), are garnering increasing interest due to their potential application to important technologies such as photovoltaics, chemical sensing, ion-filtration, and nanoelectronics. Semi-conducting GNMs designed to have fractional eV band gaps are good candidates for graphene-based electronics, provided that a mechanism for their stable and controlled doping is developed. Recent work has shown that controlled passivation of the edges of subnanometer pores and subsequent doping by atoms or molecules gives rise to p- and n-doped GNM structures. However, these structures are difficult to fabricate at the nanoscale. Here, we use first principle calculations to study the effect of the pore size on the doping physics of GNM structures with larger pores that can potentially host more than a single dopant. We show that such doping mechanism is effective even for pores with relatively large radii. We also study the effect of the number of dopants per pore on doping stability. We find that stable rigid band n- and p-doping emerges in such structures even if the dopants form a nano-cluster in the pore - rigid band doping is achieved in all n- and p-doping studied. Such doped large-pore GNM structures have potential applications as transparent conducting electrodes, and also as field effect transistors. .

Links

• Seminars at the IFW

Letztmalig verändert: 04.09.2017, 09:49:20