Numerical Study of Graphene Superlattice-Based Photodetectors

Author

Moradinasab, Mahdi ; Pourfath, Mahdi ; Fathipour, Morteza ; Kosina, Hans

Author_Institution

Sch. of Electr. & Comput. Eng., Univ. of Tehran, Tehran, Iran

Volume

62

Issue

2

fYear

2015

fDate

Feb. 2015

Firstpage

593

Lastpage

600

Abstract

The optical properties of 1-D superlattices formed by armchair graphene nanoribbons embedded in hexagonal boron nitride superlattices (BNSLs) are studied. A set of tight-binding (TB) parameters is proposed, which gives results in excellent agreement with first-principle calculations. Based on the tight-binding model, it is demonstrated that in BNSLs, a larger bandgap opening is achieved than in hydrogen-passivated superlattices (HSL). The optical properties of BNSL and HSL are studied by employing the nonequilibrium Green function method and are verified with first-principle calculations. The role of line-edge roughness on the optical properties of such devices is carefully investigated.

Keywords

Green´s function methods; ab initio calculations; boron compounds; graphene; graphene devices; nanoribbons; nanosensors; numerical analysis; optical sensors; passivation; photodetectors; superlattices; 1D superlattice; BNSL; C-BN; HSL; TB parameter; armchair graphene nanoribbon; first-principle calculation; graphene superlattice-based photodetector; hexagonal boron nitride superlattice; hydrogen-passivated superlattice; line-edge roughness; nonequilibrium Green function method; numerical study; optical property; tight-binding parameter model; Boron; Graphene; Green´s function methods; Optical superlattices; Photodetectors; Photonics; Graphene superlattice; line-edge roughness; nonequilibrium Green's function (NEGF); nonequilibrium Green???s function (NEGF); optical properties; photodetector; photodetector.;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2014.2383354

Filename

7005426