Probing exciton localization in single-walled carbon nanotubes using high-resolution near-field microscopy.
basic_science · Level V
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- Record sourced from PubMed, PMID 20857945.
- Also identified by DOI 10.1021/nn101443d.
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Abstract
We observe localization of excitons in semiconducting single-walled carbon nanotubes at room temperature using high-resolution near-field photoluminescence (PL) microscopy. Localization is the result of spatially confined exciton energy minima with depths of more than 15 meV connected to lateral energy gradients exceeding 2 meV/nm as evidenced by energy-resolved PL imaging. Simulations of exciton diffusion in the presence of energy variations support this interpretation predicting strongly enhanced PL at local energy minima.
Medical subject headings
- Microscopy
- Nanotechnology
- Nanotubes, Carbon