# Diffusive and Unimolecular Nonradiative Decay of Excited States in Doped Carbon Nanotubes

Source: [Diffusive and Unimolecular Nonradiative Decay of Excited States in Doped Carbon Nanotubes](<https://www.sota2.com/research/paper/68fa44c61e209131ce91380c>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-25T04:56:52.982Z

Authors: Klaus H. Eckstein, Pascal Kunkel, Markus Voelckel, Friedrich Sch\\"oppler, Abasi Abudulimu, Larry L\\"uer, Tobias Hertel

Published: 2021-03-29T10:28:08.000Z

## Abstract

Doping can profoundly affect the electronic- and optical-structure of semiconductors. Here we address the effect of surplus charges on non-radiative (NR) exciton and trion decay in doped semiconducting single-wall carbon nanotubes. The dependence of exciton photoluminescence quantum yields and exciton decay on the doping level, with its characteristically stretched-exponential kinetics, is attributed to diffusion-limited NR decay at charged impurity sites. By contrast, trion decay is unimolecular with a rate constant of $2.0\\,\\rm ps^{-1}$. Our experiments thus show that charged impurities not only trap trions and scavenge mobile excitons but that they also facilitate efficient NR energy dissipation for both.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2103.15477>)

[PDF](<https://arxiv.org/pdf/2103.15477.pdf>)