Improving the Performance of Organic Thin-Film Transistors by Ion Doping of Ethylene-Glycol-Based Self-Assembled Monolayer Hybrid Dielectrics

Hanno Dietrich, Simon Scheiner, Lui Portilla, Dirk Zahn, Marcus Halik Abstract Tuning the electrostatics of ethylene-glycol-based self-assembled monolayers (SAMs) by doping with ions is shown. Molecular dynamics simulations unravel binding mechanisms and predict dipole strengths of the doped layers. Additionally, by applying such layers as dielectrics in organic thin-film transistors, the incorporated ions are proven […]

Interface engineering of molecular charge storage dielectric layers fo organic thin-film memory transistors

Artoem Khassanov, Thomas Schmaltz, Hans-Georg Steinrück, Andreas Magerl, Andreas Hirsch, and Marcus Halik. Abstract Mixed self-assembled monolayers of C60-functionalized and different long-chained insulating phosphonic acids provide molecular scale non-volatile memory dielectrics for low-voltage organic thin-film transistors. The memory retention depends on the insulation of the C60 moiety and can be improved by embedding into the […]

The mutual influence of surface energy and substrate temperature on the saturation mobility in organic semiconductors

Marco Sarcletti, Thomas Schmaltz, Marcus Halik Abstract We report on a mutual correlation between the substrate temperature during semiconductor deposition and the surface energy of the gate dielectric on the charge carrier mobility in bottom gate top contact organic field effect transistors (OFETs) with N,N′-diphenyl-3,4,9,10-perylene tetracarboxylic diimide (DP-PDI) as organic semiconductor. The gate dielectric consists […]

Driving forces for the self-assembly of graphene oxide on organic monolayers

Johannes Kirschner, Zhenxing Wang, Siegfried Eigler, Han-Peter Steinrück, Christof M. Jäger, Timothy Clark, Andreas Hirsch and Marcus Halik Abstract Graphene oxide (GO) flakes were self-assembled from solution on surfaces of self-assembled monolayers (SAMs), varying in the chemical structure of their head groups. The coverage density of GO relates to strength of attractive interaction, which is […]

Smoothly Tunable Surface Properties of Aluminum Oxide Core−Shell Nanoparticles By A Mixed-Ligand Approach

Luis Portilla and Marcus Halik Abstract We present a facile solution-based procedure for tailoring the surface properties of aluminum oxide nanoparticles (AlOx-NPs) by the formation of tunable core–shell systems with self-assembled monolayers. By employing chained molecules with a phosphonic acid anchor group and either hydrophobic or hydrophilic chains the surface properties of the nanoparticles change […]

Ambient Surface Analysis of Organic Monolayers using Direct Analysis in Real Time Orbitrap Mass Spectrometry

Radostina K. Manova, Sweccha Joshi, Aline Debrassi, Nagendra S. Bhairamadgi, Esther Roeven, Jacinthe Gagnn, Muhammad N. Tahir, Franck W. Claassen, Luc M.W. Scheres,Tom Wennekes, Karin Schroën, Teris A. van Beek, Han Zuilhof, and Michel W.F. Nielen. Abstract A better characterization of nanometer-thick organic layers (monolayers) as used for engineering surface properties, biosensing, nanomedicine, and smart […]

Low-voltage self-assembled monolayer field-effect transistor on flexible substrates

Thomas Schmaltz, Atefeh Y. Amin, Artoem Khassanov, Timo Meyer-Friedrichsen, Hans-Georg Steinrück, Andreas Magerl, Juan José Segura, Kislon Voitchovsky ,Francesco Stellacci, and Marcus Halik. Abstract Self-assembled monolayer field-effect transistors (SAMFETs) of BTBT functionalized phosphonic acids are fabricated. The molecular design enables device operation with charge carrier mobilities up to 10−2 cm2 V−1 s−1 and for the […]

Polyetlectrolye multilayer deposition on nickel modified with self-assembled monolayers of organophosphonic acids for biomaterials : electrochemical and spectroscopic evaluation

Sébastien Devillers, Jean-François Lemineur, V. S. Dilimon, Bastien Barthélémy, Joseph Delhalle, and Zineb Mekhalif. Abstract ABSTRACT: Layer-by-layer assembly of polyelectrolytes is an efficient method for the formation of functional thin films with the prospect of biomedical applications. Polyethyleneimine (PEI) is commonly used as an adhesion promoter but has been shown to be potentially cytotoxic and […]