title: Light Control of Charge Transfer and Excitonic Transitions in a Carbon Nanotube/Porphyrin Hybrid.
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.
authors.affiliation: Institut Néel, CNRS, BP 166, Grenoble Cedex 9, 38042, Grenoble, France.|Institut Néel, Univ. Grenoble Alpes, F-38000, Grenoble, France.
authors.forename: Yani
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Univ. Grenoble Alpes, CNRS, Département Chimie Moléculaire (UMR 5250), F-38000, Grenoble, France.
authors.forename: Guy
authors.initials: G
authors.lastname: Royal
authors.affiliation: CIRIMAT, UMR CNRS-UPS-INP No5085, Université Toulouse 3 Paul Sabatier, Bât. CIRIMAT, 118, route de Narbonne, 31062, Toulouse Cedex 9, France.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Flahaut
authors.affiliation: Univ. Grenoble Alpes, CNRS, Département Chimie Moléculaire (UMR 5250), F-38000, Grenoble, France.
authors.forename: Saioa
authors.initials: S
authors.lastname: Cobo
authors.affiliation: Institut Néel, CNRS, BP 166, Grenoble Cedex 9, 38042, Grenoble, France.|Institut Néel, Univ. Grenoble Alpes, F-38000, Grenoble, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Bouchiat
authors.affiliation: Institut Néel, CNRS, BP 166, Grenoble Cedex 9, 38042, Grenoble, France.|Institut Néel, Univ. Grenoble Alpes, F-38000, Grenoble, France.
authors.forename: Laëtitia
authors.initials: L
authors.lastname: Marty
authors.affiliation: Institut Néel, CNRS, BP 166, Grenoble Cedex 9, 38042, Grenoble, France.|Institut Néel, Univ. Grenoble Alpes, F-38000, Grenoble, France.
authors.forename: Nedjma
authors.initials: N
authors.lastname: Bendiab
keywords: Raman enhancement; nanotubes; optoelectronics; porphyrins; single electron tunneling