Photoresponse of supramolecular self-assembled networks on graphene-diamond interfaces

Nature Communications
Sarah WiegholdCarlos-Andres Palma

Abstract

Nature employs self-assembly to fabricate the most complex molecularly precise machinery known to man. Heteromolecular, two-dimensional self-assembled networks provide a route to spatially organize different building blocks relative to each other, enabling synthetic molecularly precise fabrication. Here we demonstrate optoelectronic function in a near-to-monolayer molecular architecture approaching atomically defined spatial disposition of all components. The active layer consists of a self-assembled terrylene-based dye, forming a bicomponent supramolecular network with melamine. The assembly at the graphene-diamond interface shows an absorption maximum at 740 nm whereby the photoresponse can be measured with a gallium counter electrode. We find photocurrents of 0.5 nA and open-circuit voltages of 270 mV employing 19 mW cm(-2) irradiation intensities at 710 nm. With an ex situ calculated contact area of 9.9 × 10(2) μm(2), an incident photon to current efficiency of 0.6% at 710 nm is estimated, opening up intriguing possibilities in bottom-up optoelectronic device fabrication with molecular resolution.

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Citations

Aug 7, 2018·Chemical Communications : Chem Comm·Daling CuiFederico Rosei
Sep 23, 2018·Chemistry : a European Journal·Nuo-Hua XieMing-Qiang Zhu
Apr 17, 2019·Chemical Communications : Chem Comm·Chenyang YuanYongfeng Wang
Oct 5, 2017·Chemical Communications : Chem Comm·Constance R PfeifferNeil R Champness
Jun 11, 2019·ACS Applied Materials & Interfaces·Nuo-Hua XieMing-Qiang Zhu
Sep 20, 2019·The Journal of Physical Chemistry Letters·José D Cojal GonzálezJürgen P Rabe
Jan 19, 2022·Nano Letters·Carlos R Lien-MedranoThomas Frauenheim

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Methods Mentioned

BETA
scanning tunnelling microscopy
fluorescence spectroscopy

Software Mentioned

WSxM
Gwyddion

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