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High energetic excitons in carbon nanotubes directly probe charge-carriers
Please always quote using this URN: urn:nbn:de:bvb:20-opus-143061
- Theory predicts peculiar features for excited-state dynamics in one dimension (1D) that are difficult to be observed experimentally. Single-walled carbon nanotubes (SWNTs) are an excellent approximation to 1D quantum confinement, due to their very high aspect ratio and low density of defects. Here we use ultrafast optical spectroscopy to probe photogenerated charge-carriers in (6,5) semiconducting SWNTs. We identify the transient energy shift of the highly polarizable S\(_{33}\) transition as a sensitive fingerprint of charge-carriers in SWNTs.Theory predicts peculiar features for excited-state dynamics in one dimension (1D) that are difficult to be observed experimentally. Single-walled carbon nanotubes (SWNTs) are an excellent approximation to 1D quantum confinement, due to their very high aspect ratio and low density of defects. Here we use ultrafast optical spectroscopy to probe photogenerated charge-carriers in (6,5) semiconducting SWNTs. We identify the transient energy shift of the highly polarizable S\(_{33}\) transition as a sensitive fingerprint of charge-carriers in SWNTs. By measuring the coherent phonon amplitude profile we obtain a precise estimate of the Stark-shift and discuss the binding energy of the S\(_{33}\) excitonic transition. From this, we infer that charge-carriers are formed instantaneously (<50 fs) even upon pumping the first exciton, S\(_{11}\). The decay of the photogenerated charge-carrier population is well described by a model for geminate recombination in 1D.…
Author: | Giancarlo Soavi, Francesco Scotognella, Daniele Viola, Timo Hefner, Tobias Hertel, Giulio Cerullo, Guglielmo Lanzani |
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URN: | urn:nbn:de:bvb:20-opus-143061 |
Document Type: | Journal article |
Faculties: | Fakultät für Chemie und Pharmazie / Institut für Physikalische und Theoretische Chemie |
Language: | English |
Parent Title (English): | Scientific Reports |
Year of Completion: | 2015 |
Volume: | 5 |
Issue: | 9681 |
Source: | Scientific Reports 5, 9681 (2015). DOI: 10.1038/srep09681 |
DOI: | https://doi.org/10.1038/srep09681 |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 541 Physikalische Chemie |
Tag: | carbon nanotubes and fullerenes; high energy; optical spectroscopy |
Release Date: | 2017/11/02 |
EU-Project number / Contract (GA) number: | 604391 |
EU-Project number / Contract (GA) number: | 316633 |
OpenAIRE: | OpenAIRE |
Licence (German): | CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |