High Energetic Excitons in Carbon Nanotubes Directly Probe Charge-carriers

Overview

Journal Sci Rep

Specialty Science

Date 2015 May 12

PMID 25959462

Citations 10

Authors

Giancarlo Soavi

Francesco Scotognella

Daniele Viola

Timo Hefner

Tobias Hertel

Giulio Cerullo

Guglielmo Lanzani

Affiliations

Soon will be listed here.

Abstract

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 S33 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 S33 excitonic transition. From this, we infer that charge-carriers are formed instantaneously (<50 fs) even upon pumping the first exciton, S11. The decay of the photogenerated charge-carrier population is well described by a model for geminate recombination in 1D.

Citing Articles

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