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Doping substantially influences the electronic and photophysical propertiesof semiconducting single-wall carbon nanotubes (s-SWNTs). Although priorstudies have noted that surplus charge carriers modify optical spectra andaccelerate non-radiative exciton decay in doped s-SWNTs, a direct mechanisticcorrelation of trion formation, exciton dynamics and energetics remainselusive. This work examines the influence of doping-induced non-radiative decayand exciton confinement on s-SWNT photophysics. Using photoluminescence,continuous-wave absorption, and pump-probe spectroscopy, we show thatlocalization of and barrier formation by trapped charges can be jointlyquantified using diffusive exciton transport- and particle-in-the-box models,yielding a one-to-one correlation between charge carrier concentrations derivedfrom these models. The study highlights the multifaceted role of exohedralcounterions, which trap charges to create quenching sites, form barriers toexciton movement, and host trion states. This contributes significantly tounderstanding and optimizing the photophysical properties of doped SWNTs.

Trions, Exciton Dynamics and Spectral Modifications in Doped Carbon Nanotubes: A Singular Defect-Driven Mechanism