Carrier Recombination Dynamics in Sulfur-Doped InP Nanowires.

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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.

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Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Nanoteknik
Originalspråkengelska
Sidor (från-till)7238-7244
TidskriftNano Letters
Volym15
Utgivningsnummer11
StatusPublished - 2015
PublikationskategoriForskning
Peer review utfördJa