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

fYear

2010

fDate

12-15 Oct. 2010

Firstpage

6

Lastpage

9

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology Materials and Devices Conference (NMDC), 2010 IEEE

Conference_Location

Monterey, CA

Print_ISBN

978-1-4244-8896-4

Type

conf

DOI

10.1109/NMDC.2010.5649618

Filename

5649618