title: Carrier Recombination Dynamics in Sulfur-Doped InP Nanowires.
abstract: Measuring lifetime of photogenerated charges in semiconductor nanowires (NW) is important for understanding light-induced processes in these materials and is relevant for their photovoltaic and photodetector applications. In this paper, we investigate the dynamics of photogenerated charge carriers in a series of as-grown InP NW with different levels of sulfur (S) doping. We observe that photoluminescence (PL) decay time as well as integrated PL intensity decreases with increasing S doping. We attribute these observations to hole trapping with the trap density increased due to S-doping level followed by nonradiative recombination of trapped charges. This assignment is proven by observation of the trap saturation in three independent experiments: via excitation power and repetition rate PL lifetime dependencies and by PL pump-probe experiment.
authors.affiliation: Division of Chemical Physics, Lund University , Box 124, 221 00 Lund, Sweden.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Department of Solid State Physics, Lund University , Box 118, 221 00 Lund, Sweden.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Lehmann
authors.affiliation: Department of Solid State Physics, Lund University , Box 118, 221 00 Lund, Sweden.
authors.forename: Kilian
authors.initials: K
authors.lastname: Mergenthaler
authors.affiliation: Institute for X-ray Physics, University of Göttingen , Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
authors.forename: Jesper
authors.initials: J
authors.lastname: Wallentin
authors.affiliation: Department of Solid State Physics, Lund University , Box 118, 221 00 Lund, Sweden.
authors.forename: Magnus T
authors.initials: MT
authors.lastname: Borgström
authors.affiliation: Department of Solid State Physics, Lund University , Box 118, 221 00 Lund, Sweden.
authors.forename: Mats-Erik
authors.initials: ME
authors.lastname: Pistol
authors.affiliation: Division of Chemical Physics, Lund University , Box 124, 221 00 Lund, Sweden.
authors.forename: Arkady
authors.initials: A
authors.lastname: Yartsev
keywords: Nanowire; carrier recombination; doping; hole trapping; photoluminescence