Faculty Sponsor(s)
Michael Crosser
Location
Jereld R. Nicholson Library
Subject Area
Physics
Description
This research reports measurements of electron mobility in liquid-gated graphene. Graphene field-effect transistor (GFET) biosensors are more sensitive to changes in external fields when the mobility is high; therefore increasing mobility will improve sensitivity. Mobility can be calculated from the ratio of sheet conductivity to carrier density. 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.
Recommended Citation
Harmon, Christina A., "Measuring Charge Carrier Mobility of Graphene" (2015). Linfield University Student Symposium: A Celebration of Scholarship and Creative Achievement. Event. Submission 28.
https://digitalcommons.linfield.edu/symposium/2015/all/28
Measuring Charge Carrier Mobility of Graphene
Jereld R. Nicholson Library
This research reports measurements of electron mobility in liquid-gated graphene. Graphene field-effect transistor (GFET) biosensors are more sensitive to changes in external fields when the mobility is high; therefore increasing mobility will improve sensitivity. Mobility can be calculated from the ratio of sheet conductivity to carrier density. 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.
