title: Competing Photocurrent Mechanisms in Quasi-Metallic Carbon Nanotube pn Devices.
abstract: Photodetectors based on quasi-metallic carbon nanotubes exhibit unique optoelectronic properties. Due to their small bandgap, photocurrent generation is possible at room temperature. The origin of this photocurrent is investigated to determine the underlying mechanism, which can be photothermoelectric effect or photovoltaic effect, depending on the bandgap magnitude of the quasi-metallic nanotube.
authors.affiliation: Center of Excellence for Green Nanotechnologies, University of California Los Angeles, CA 90095, USA and King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia.
authors.forename: Moh R
authors.initials: MR
authors.lastname: Amer
authors.affiliation: Department of Physics and Astronomy, University of Southern California, Los Angeles, CA, 90089, USA.
authors.forename: Shun-Wen
authors.initials: SW
authors.lastname: Chang
authors.affiliation: Department of Physics and Astronomy, University of Southern California, Los Angeles, CA, 90089, USA.|Department of Electrical Engineering, University of Southern California, Los Angeles, CA, 90089, USA.|Department of Material Science, University of Southern California, Los Angeles, CA, 90089, USA.
authors.forename: Stephen B
authors.initials: SB
authors.lastname: Cronin
keywords: bandgaps; carbon nanotubes; carrier generation rates; photocurrents, photothermoelectric effect; thermoelectric power