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Elaboration d'auto-assemblages supramoléculaires de Donneurs et Accepteurs d'électrons sur Au(111) et leur étude par microscopie à Effet Tunnel couplée à une excitation laser.

Abstract : We present the 2D self-assembly of molecular electron Donors (D) and Acceptors (A) on Au(111) and their study by Light-Assisted Scanning Tunneling Microscopy (LA-STM). Firstly, hydrogen bonded supramolecular assemblies are elaborated from solutions. On one hand, a the self-assembly of a porphyrin derivative (D) show the relationship between the established hydrogen bonds and the obtained geometry. On the other hand, a PTCDI-melamine porous host network was used to template the growth of guest molecules within the pores. Host-guest systems are then elaborated using a thiolated porphyrin derivative and a polyoxometalate (POM) molecule. A surface infrared analysis (PM-IRRAS) shows that the network has different effects on the growth process and orientation angles of the two molecules.Secondly, we developed a LA-STM setup and we analysed a polymer/fullerene (PTB7/PC71BM) D/A molecular system. After the study of the photo-physical phenomena giving rise to the photo-current, we measured the current at opposite bias voltages DI=I(V+)-I(V-). We attribute this current to the photo-absorption of the molecules and to the electron transfer at the molecular D/A junctions which allows us to identify the active junctions on the surface with the nanometre resolution.
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Submitted on : Tuesday, November 27, 2018 - 6:57:07 PM
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  • HAL Id : tel-01937003, version 1

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Andrés Felipe Lombana. Elaboration d'auto-assemblages supramoléculaires de Donneurs et Accepteurs d'électrons sur Au(111) et leur étude par microscopie à Effet Tunnel couplée à une excitation laser.. Autre. Université Sorbonne Paris Cité, 2017. Français. ⟨NNT : 2017USPCC069⟩. ⟨tel-01937003⟩

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