Abstract
Based on the first principles calculation, we investigate the electronic band structures of graphene-MoS2 and Ti-MoS2 heterojunctions under gate-voltages. By simultaneous control of external electric fields and carrier charging concentrations, we show that the graphene’s Dirac point position inside the MoS2 bandgap is easily modulated with respect to the co-varying Fermi level, while keeping the graphene’s linear band structure around the Dirac point. The easy modulation of graphene bands is not confined to the special cases where the conduction-band-minimum point of MoS2 and the Dirac point of graphene are matched up in reciprocal space, but is generalized to their dislocated cases. This flexibility caused by the strong decoupling between graphene and MoS2 bands enhances the gate-controlled switching performance in MoS2-graphene hybrid stacking-device.
Highlights
Based on the first principles calculation, we investigate the electronic band structures of grapheneMoS2 and Ti-MoS2 heterojunctions under gate-voltages
Extensive efforts have been carried out to take advantages from each material and combine them into a single device. Prominent accomplishments in such efforts are the synthesis of stacked graphene-MoS2 junctions[20,21,22,23] and their application to field effect transistors (FETs)[24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39] in which MoS2 and graphene are used as a channel and source(S)-drain(D) electrodes, respectively
This choice follows from a prior estimation based on the Schottky-Mott rule[51,52,53], which states that the potential barrier height at the interface is given by the energy difference between the semiconductor electron affinity and the metal work function
Summary
Based on the first principles calculation, we investigate the electronic band structures of grapheneMoS2 and Ti-MoS2 heterojunctions under gate-voltages. EC, ED, and EF represent the CBM energy of MoS2, the Dirac point energy of graphene, and the Fermi level of the whole system, respectively.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
