title: Ultrafast photocurrent measurement of the escape time of electrons and holes from carbon nanotube p-i-n photodiodes.
abstract: Ultrafast photocurrent measurements are performed on individual carbon nanotube p-i-n photodiodes. The photocurrent response to subpicosecond pulses separated by a variable time delay Δt shows strong photocurrent suppression when two pulses overlap (Δt=0). The picosecond-scale decay time of photocurrent suppression scales inversely with the applied bias V(SD), and is twice as long for photon energy above the second subband E22 as compared to lower energy. The observed photocurrent behavior is well described by an escape time model that accounts for carrier effective mass.
authors.affiliation: Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Nathaniel M
authors.initials: NM
authors.lastname: Gabor
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Zhong
authors.forename: Ken
authors.initials: K
authors.lastname: Bosnick
authors.forename: Paul L
authors.initials: PL
authors.lastname: McEuen