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Three-Dimensional Chemical Mapping of OTFT on Modified Hydrophobic Flexible Polymeric Substrate by Low Energy Cs+ Ion Sputtering

preprint
submitted on 24.04.2018, 09:34 and posted on 24.04.2018, 15:27 by Luca Tortora, Marco Urbini, Mario Barra, Antonio Cassinese, Paolo Branchini, Alberto Aloisio, Fabio Chiarella, Luigi Mariucci, Matteo Rapisarda, Andrea Fabbri, Francesco Di Capua

Here, electron-transporting semiconducting organic channels made of N,N′-1H, 1H-perfluorobutyl dicyanoperylenecarboxydiimmide (PDIF-CN2) molecules were thermally evaporated on flexible polyethylene-naphtalate (PEN) plastic substrates equipped with gold (Au) electrodes. This multilayer structure represents the basic component for the fabrication of staggered top-gate n-type organic thin-film transistors (OTFTs) to be completed with the addition of a polymeric dielectric layer and an aluminum gate electrode. PEN substrate was treated with hexamethyldisilazane (HMDS) in order to make it more hydrophobic. Indeed, the hydrophobized surface of the plastic substrate was shown to induce a more ordered supramolecular structure of the semiconductor layer during the evaporation process. The hybrid organic/inorganic formally trilayer non-passivated OTFT structure was successfully profiled in a single run through ToF-SIMS depth profiling experiments with low energy cesium ions. High mass molecular fragment ions were obtained and used as indicators of interfaces, leading to an increase of information on molecular specificity. The HMDS surface modification was clearly detected and spatially located. Finally, a chemometric approach was also adopted to evaluate depth profiling data. In particular, principal component analysis (PCA) and K-means algorithm were tested as innovative method for the identification of molecular fragments useful for the OTFT multi-layer structure characterization and the determination of the number of OTFT layers, respectively.

History

Email Address of Submitting Author

luca.tortora@uniroma3.it

Institution

Surface Analysis Laboratory INFN, Roma Tre University, via della Vasca Navale 84, 00146, Rome, Italy

Country

Italia

ORCID For Submitting Author

0000-0003-3053-2406

Declaration of Conflict of Interest

no conflict of interest

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