Graphene with adsorbed molecules: transport properties in radio frequency transistors and sensors

• Grant number: 12/12242-6
• Support Opportunities: Scholarships in Brazil - Master
• Start date: September 01, 2012
• End date: February 28, 2014
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Adalberto Fazzio
• Grantee: Alexsandro Kirch
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

This project is based on recently studies on the use of graphene in semiconductor devices. Some important steps have been taken in the direction for the use of graphene in transistors construction and the great interest is due to electronic mobility, which presents much greater in graphene than in the silicon, used in current transistors. Due to this feature, the graphene transistors shown ideal for use in radio frequency telecommunications, allowing much faster information exchange. However, researches are needed to effective the use of graphene in electronics devices, and this project seeks to an important step in this direction. The electronic and transport properties of graphene transistors have been extensively studied through computational simulation, and the Density Functional Theory is being used for this, being implemented in SIESTA computer code, together with the Theory of Non-Equilibrium Green Function Method implemented in the TRANSAMPA code . We intend to go in this direction, but now , we do not use the pristine graphene, it wants to do with defects and adsorbed molecules for the purpose of understanding how the electronic and transport properties change compared with pristine graphene transistors. If an change in these properties exists, one can propose graphene as a sensor and a extensive study will be done accordingly, with different types of molecules, looking so, to associat with each type of molecule adsorbed on graphene, a given current, determinated with Theory of Electronic Transport. This study appears to be important for both transistor and sensor construction.

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

KIRCH, Alexsandro. Eletronic properties in nanosystems based on carbono nanotubes and graphene. 2014. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Física (IF/SBI) São Paulo.