Collective molecular switching in hybrid superlattices for light-modulated two-dimensional electronics

Marco Gobbi (), Sara Bonacchi, Jian X. Lian, Alexandre Vercouter, Simone Bertolazzi, Björn Zyska, Melanie Timpel, Roberta Tatti, Yoann Olivier, Stefan Hecht, Marco V. Nardi, David Beljonne, Emanuele Orgiu and Paolo Samorì ()
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Marco Gobbi: University of Strasbourg, CNRS, ISIS UMR 7006
Sara Bonacchi: University of Strasbourg, CNRS, ISIS UMR 7006
Jian X. Lian: University of Mons
Alexandre Vercouter: University of Mons
Simone Bertolazzi: University of Strasbourg, CNRS, ISIS UMR 7006
Björn Zyska: Humboldt-Universität zu Berlin
Melanie Timpel: University of Trento
Roberta Tatti: IMEM-CNR, Institute of Materials for Electronics and Magnetism, Trento unit
Yoann Olivier: University of Mons
Stefan Hecht: Humboldt-Universität zu Berlin
Marco V. Nardi: University of Trento
David Beljonne: University of Mons
Emanuele Orgiu: University of Strasbourg, CNRS, ISIS UMR 7006
Paolo Samorì: University of Strasbourg, CNRS, ISIS UMR 7006

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Molecular switches enable the fabrication of multifunctional devices in which an electrical output can be modulated by external stimuli. The working mechanism of these devices is often hard to prove, since the molecular switching events are only indirectly confirmed through electrical characterization, without real-space visualization. Here, we show how photochromic molecules self-assembled on graphene and MoS2 generate atomically precise superlattices in which a light-induced structural reorganization enables precise control over local charge carrier density in high-performance devices. By combining different experimental and theoretical approaches, we achieve exquisite control over events taking place from the molecular level to the device scale. Unique device functionalities are demonstrated, including the use of spatially confined light irradiation to define reversible lateral heterojunctions between areas possessing different doping levels. Molecular assembly and light-induced doping are analogous for graphene and MoS2, demonstrating the generality of our approach to optically manipulate the electrical output of multi-responsive hybrid devices.

Date: 2018
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DOI: 10.1038/s41467-018-04932-z

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