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Adv Mater. 2017 May;29(18). doi: 10.1002/adma.201605745. Epub 2017 Mar 17.

Light Control of Charge Transfer and Excitonic Transitions in a Carbon Nanotube/Porphyrin Hybrid.

Author information

1
Institut Néel, CNRS, BP 166, Grenoble Cedex 9, 38042, Grenoble, France.
2
Institut Néel, Univ. Grenoble Alpes, F-38000, Grenoble, France.
3
Univ. Grenoble Alpes, CNRS, Département Chimie Moléculaire (UMR 5250), F-38000, Grenoble, France.
4
CIRIMAT, UMR CNRS-UPS-INP No5085, Université Toulouse 3 Paul Sabatier, Bât. CIRIMAT, 118, route de Narbonne, 31062, Toulouse Cedex 9, France.

Abstract

Carbon nanotube-chromophore hybrids are promising building blocks in order to obtain a controlled electro-optical transduction effect at the single nano-object level. In this work, a strong spectral selectivity of the electronic and the phononic response of a chromophore-coated single nanotube transistor is observed for which standard photogating cannot account. This paper investigates how light irradiation strongly modifies the coupling between molecules and nanotube within the hybrid by means of combined Raman diffusion and electron transport measurements. Moreover, a nonconventional Raman enhancement effect is observed when light irradiation is on the absorption range of the grafted molecule. Finally, this paper shows how the dynamics of single electron tunneling in the device at low temperature is strongly modified by molecular photoexcitation. Both effects will be discussed in terms of photoinduced excitons coupled to electronic levels.

KEYWORDS:

Raman enhancement; nanotubes; optoelectronics; porphyrins; single electron tunneling

PMID:
28306176
DOI:
10.1002/adma.201605745

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