title: Time-resolved photoinduced thermoelectric and transport currents in GaAs nanowires.
abstract: In order to clarify the temporal interplay of the different photocurrent mechanisms occurring in single GaAs nanowire based circuits, we introduce an on-chip photocurrent pump-probe spectroscopy with a picosecond time resolution. We identify photoinduced thermoelectric, displacement, and carrier lifetime limited currents as well as the transport of photogenerated holes to the electrodes. Moreover, we show that the time-resolved photocurrent spectroscopy can be used to investigate the drift velocity of photogenerated carriers in semiconducting nanowires. Hereby, our results are relevant for nanowire-based optoelectronic and photovoltaic applications.
authors.affiliation: Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4a, 85748 Garching, Germany.
authors.forename: Leonhard
authors.initials: L
authors.lastname: Prechtel
authors.forename: Milan
authors.initials: M
authors.lastname: Padilla
authors.forename: Nadine
authors.initials: N
authors.lastname: Erhard
authors.forename: Helmut
authors.initials: H
authors.lastname: Karl
authors.forename: Gerhard
authors.initials: G
authors.lastname: Abstreiter
authors.forename: Anna
authors.initials: A
authors.lastname: Fontcuberta I Morral
authors.forename: Alexander W
authors.initials: AW
authors.lastname: Holleitner