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Carrier Recombination Dynamics in Sulfur-Doped InP Nanowires

, : Carrier Recombination Dynamics in Sulfur-Doped InP Nanowires. Nano Letters 15(11): 7238-7244

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.


PMID: 26421505

DOI: 10.1021/acs.nanolett.5b02022

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