title: Origins of charge noise in carbon nanotube field-effect transistor biosensors.
abstract: Determining the major noise sources in nanoscale field-effect transistor (nanoFET) biosensors is critical for improving bioelectronic interfaces. We use the carbon nanotube (CNT) FET biosensor platform to examine the noise generated by substrate interactions and surface adsorbates, both of which are present in current nanoFET biosensors. The charge noise model is used as a quantitative framework to show that insulating substrates and surface adsorbates are both significant contributors to the noise floor of CNT FET biosensors. Removing substrate interactions and surface adsorbates reduces the power spectral density of background voltage fluctuations by 19-fold.
authors.affiliation: Department of Physics, Oregon State University, Corvallis, Oregon 97331-6507, United States.
authors.forename: Tal
authors.initials: T
authors.lastname: Sharf
authors.forename: Joshua W
authors.initials: JW
authors.lastname: Kevek
authors.forename: Tristan
authors.initials: T
authors.lastname: Deborde
authors.forename: Jenna L
authors.initials: JL
authors.lastname: Wardini
authors.forename: Ethan D
authors.initials: ED
authors.lastname: Minot
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D004867:Equipment Design; D008958:Models, Molecular; D037742:Nanotubes, Carbon / Q000737:chemistry*; D059629:Signal-To-Noise Ratio; D014173:Transistors, Electronic
chemical_list: D037742:Nanotubes, Carbon