Abstract
We present the formation and decay dynamics of a trion (charged exciton) and exciton system in chemically $p$-doped single-walled carbon nanotubes (SWNTs) investigated by time-resolved photoluminescence measurements at 300 K. In (6,5) SWNTs with hole densities in the range of 0.27--1.05 nm${}^{\ensuremath{-}1}$, a trion is formed from the coalescence of an exciton and a free hole, with a rate of $1.7\ifmmode\times\else\texttimes\fi{}{10}^{13}$ nm s${}^{\ensuremath{-}1}$. The linear dependence of the trion decay rate on the hole density allows us to find that the trion decay is governed by both a trion-hole Auger recombination process and an internal Auger recombination process. The observed high efficiencies of Auger processes dominate over the radiative recombination rate of trions, which demonstrates dynamic properties of excitonic complexes in the presence of enhanced Coulomb interactions in one-dimensional systems.
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