Thesis (Open Access)
Bachelor of Science in Physics
Michael Crosser (Thesis Advisor) Jennifer Heath & Joelle Murray (Committee Members)
Biological and Chemical Physics | Condensed Matter Physics | Physics
This research reports measurements of electron mobility in Graphene Field Effect Transistors (GFET), gated with liquid. Mobility is a quantity describing how easily charge carriers move through a material. GFET biosensors have the greatest sensitivity when the mobility is high; therefore, increasing mobility should improve sensitivity of these and similar devices. An optimal method was established for preparing samples and taking measurements of a liquid-gate device. Sheet conductivity was measured using van der Pauw geometry and carrier density was determined from measurements of the liquid-gate capacitance. It is shown that mobility improves after the graphene surface is cleaned by an annealing process.
Harmon, Christina A., "Measuring Charge Carrier Mobility in Graphene" (2015). Senior Theses. 13.