TY - JOUR
T1 - Ge-intercalated graphene: The origin of the p-type to n-type transition
AU - Kaloni, Thaneshwor P.
AU - Kahaly, M. Upadhyay
AU - Cheng, Yingchun
AU - Schwingenschlögl, Udo
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2012/9/11
Y1 - 2012/9/11
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/562314
UR - https://iopscience.iop.org/article/10.1209/0295-5075/99/57002
UR - http://www.scopus.com/inward/record.url?scp=84866254111&partnerID=8YFLogxK
U2 - 10.1209/0295-5075/99/57002
DO - 10.1209/0295-5075/99/57002
M3 - Article
SN - 0295-5075
VL - 99
SP - 57002
JO - EPL (Europhysics Letters)
JF - EPL (Europhysics Letters)
IS - 5
ER -