title: Photothermoelectric effect in suspended semiconducting carbon nanotubes.
abstract: We have performed scanning photocurrent microscopy measurements of field-effect transistors (FETs) made from individual ultraclean suspended carbon nanotubes (CNTs). We investigate the spatial-dependence, polarization-dependence, and gate-dependence of photocurrent and photovoltage in this system. While previous studies of surface-bound CNT FET devices have identified the photovoltaic effect as the primary mechanism of photocurrent generation, our measurements show that photothermoelectric phenomena play a critical role in the optoelectronic properties of suspended CNT FETs. We have quantified the photothermoelectric mechanisms and identified regimes where they overwhelm the photovoltaic mechanism.
authors.affiliation: Department of Physics, Oregon State University , Corvallis, Oregon 97331, United States.
authors.forename: Tristan
authors.initials: T
authors.lastname: Deborde
authors.forename: Lee
authors.initials: L
authors.lastname: Aspitarte
authors.forename: Tal
authors.initials: T
authors.lastname: Sharf
authors.forename: Joshua W
authors.initials: JW
authors.lastname: Kevek
authors.forename: Ethan D
authors.initials: ED
authors.lastname: Minot