Ultrafast Photocurrent Measurement of the Escape Time of Electrons and Holes from Carbon Nanotube p-i-n Photodiodes
Author(s)Gabor, Nathaniel M.; Zhong, Zhaohui; Bosnick, Ken; McEuen, Paul L.
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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 VSD, and is twice as long for photon energy above the second subband E[subscript 22] as compared to lower energy. The observed photocurrent behavior is well described by an escape time model that accounts for carrier effective mass.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review Letters
American Physical Society
Nathaniel M. Gabor et al. "Ultrafast Photocurrent Measurement of the Escape Time of Electrons and Holes from Carbon Nanotube p-i-n Photodiodes" Physical Review Letters 108, 087404 (2012). © 2012 American Physical Society
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