Ultrafast Charge Transfer Pathways Through A Prototype Amino-Carboxylic Molecular Junction

Nano Letters
Gregor KladnikAlbano Cossaro

Abstract

Charge transport properties of a vertically stacked organic heterojunction based on the amino-carboxylic (A-C) hydrogen bond coupling scheme are investigated by means of X-ray resonant photoemission and the core-hole clock method. We demonstrate that hydrogen bonding in molecular bilayers of benzoic acid/cysteamine (BA/CA) with an A-C coupling scheme opens a site selective pathway for ultrafast charge transport through the junction. Whereas charge transport from single BA layer directly coupled to the Au(111) is very fast and it is mediated by the phenyl group, the interposition of an anchoring layer of CA selectively hinders the delocalization of electrons from the BA phenyl group but opens a fast charge delocalization route through the BA orbitals close to the A-C bond. This evidences that hydrogen bonding established upon A-C recognition can be exploited to spatially/orbitally manipulate the charge transport properties of heteromolecular junctions.

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Citations

Apr 19, 2018·Nanoscale·Abhilash RavikumarGuido Fratesi
Jul 23, 2016·Physical Chemistry Chemical Physics : PCCP·Dean CvetkoAlberto Morgante
Nov 2, 2017·Physical Chemistry Chemical Physics : PCCP·Yunier Garcia-BasabeDunieskys G Larrude
Jul 3, 2019·Physical Chemistry Chemical Physics : PCCP·Tao MaJin He
Sep 4, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Ziyu ZhangChristian A Nijhuis

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