Ge-intercalated graphene: The origin of the p-type to n-type transition

Thaneshwor P. Kaloni, M. Upadhyay Kahaly, Yingchun Cheng, Udo Schwingenschlögl

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Recently huge interest has been focussed on Ge-intercalated graphene. In order to address the effect of Ge on the electronic structure, we study Ge-intercalated free-standing C 6 and C 8 bilayer graphene, bulk C 6Ge and C 8Ge, as well as Ge-intercalated graphene on a SiC(0001) substrate, by density functional theory. In the presence of SiC(0001), there are three ways to obtain n-type graphene: i) intercalation between C layers; ii) intercalation at the interface to the substrate in combination with Ge deposition on the surface; and iii) cluster intercalation. All other configurations under study result in p-type states irrespective of the Ge coverage. We explain the origin of the different doping states and establish the conditions under which a transition occurs. © Copyright EPLA, 2012.
Original languageEnglish (US)
Pages (from-to)57002
JournalEPL (Europhysics Letters)
Volume99
Issue number5
DOIs
StatePublished - Sep 11 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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