1. Effective Metal Top Contact on the Organic Layer via Buffer-Layer-Assisted Growth: A Multiscale Characterization of Au/Hexadecanethiol/n-GaAs(100) Junctions
- Author
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Arnaud Le Pottier, Francine Solal, Sylvain Tricot, Soraya Ababou-Girard, Pascal Turban, Alexandra Junay, Sophie Guézo, Philippe Schieffer, José Avila, Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), FEDER, Federación Española de Enfermedades Raras, and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Multiscale characterizations ,Materials science ,Ballistic electron emission microscopy ,Transport measurements ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Electron transport properties ,Organic monolayers ,Metal ,Electron emission ,Hot-electron transport ,Monolayer ,Buffer layers ,Physical and Theoretical Chemistry ,Nanoscopic scale ,Spatial uniformity ,Buffer-layer-assisted growth ,Monolayers ,[PHYS]Physics [physics] ,business.industry ,Monolayer coverage ,Molecular electronics ,Heterojunction ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Characterization (materials science) ,General Energy ,Metals ,visual_art ,visual_art.visual_art_medium ,Optoelectronics ,Gold ,0210 nano-technology ,business ,Layer (electronics) - Abstract
International audience; In the field of organic and molecular electronics at monolayer coverage, the need for abrupt and well-controlled top metal contacts is a key point. A general method which provides reliable molecular junctions with most metals remains to be found. In this paper we show that reliable molecular junctions Au/hexadecanethiol/n-GaAs(100) are obtained using buffer-layer-assisted growth (BLAG). They show in hot electron transport measurements at the nanoscale a tunnel regime through the organic monolayer with a full spatial uniformity. Using ballistic electron emission microscopy (BEEM) in the spectroscopic mode as well as photoemission and C(V)-transport measurements, we draw a coherent band alignment scheme of the whole heterostructure at the nanoscale and at the macroscopic scale. Through this study, the BLAG method appears as a general method that should work for contacting organic monolayers with most metals. © 2016 American Chemical Society.
- Published
- 2016
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