Journal
ACS NANO
Volume 4, Issue 10, Pages 5914-5920Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn101443d
Keywords
single-walled carbon nanotubes; photoluminescence; excitons; localization; near-field microscopy
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Funding
- Deutsche Forschungsgemeinschaft [DFG-HA4405/3-1, DFG-HA4405/4-1]
- Nanosystems Initiative Munich (NIM)
- National Science Foundation [DMR-0520513, EEC-0647560, DMR-0706067]
- Nanoelectronics Research Initiative
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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.
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