Title :
The effects of vacancies on the transport properties of zigzag graphene nanoribbons
Author :
Zhang, Yu ; Liu, Lianqing ; Jiao, Niandong ; Xi, Ning ; Wang, Yuechao ; Dong, Zaili
Author_Institution :
State Key Lab. of Robot., Chinese Acad. of Sci., Shenyang, China
Abstract :
The transport properties of zigzag graphene nanoribbons (ZGNRs) with different patterns of vacancies are investigated by using density functional theory and nonequilibrium Green´s function (NEGF) formalism. It is found that the transport properties are different with a different lattice type vacancy (A-type or B-type vacancy). The conductance of ZGNRs is more sensitive to an interior vacancy than an edge vacancy. More importantly, the pattern of interior vacancies has enormous influence on the electron transport around the Femi energy. As hexagon carbons are removed, the ZGNRs transform from metallic to semiconducting. Thus one can tune the electron properties of ZGNRs by patterning vacancies.
Keywords :
Fermi level; Green´s function methods; density functional theory; electrical conductivity; graphene; nanostructured materials; vacancies (crystal); C; Femi energy; density functional theory; electron conductance; electron transport properties; nonequilibrium Green´s function formalism; vacancies; zigzag graphene nanoribbons; Carbon; Green´s function methods; Image edge detection; Lattices; Materials; Scattering; Temperature;
Conference_Titel :
Nanotechnology Materials and Devices Conference (NMDC), 2010 IEEE
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4244-8896-4
DOI :
10.1109/NMDC.2010.5649618
