en fr Organic Thin-Film Transistor Inkjet Printing on Flexible Substrate Impression par jet de matière de transistors organiques sur support souple Report as inadecuate




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1 PS2-ENSMSE - Département Packaging et Supports Souples

Abstract : Printing potential is undeniable as an alternative to microelectronics conventional processes for low-cost electronics device manufacturing in high volume on all kind of substrates. Within this framework, the objective was the study and implementation of the emerging inkjet-printed electronics. From a technological point of view, the first challenge consisted of an inkjet printing platform development with the required specifications for Organic Thin-Film Transistor OTFT manufacturing. The technology succeeded in printing OTFTs on different substrates from unflexible one, silicon wafer, to reach a printed flexible transistor on a plastic substrate. A complete inkjet printing parametric study allowed critical parameter identification to achieve a competitive, reliable and reproducible printing process for OTFT direct-writing. Such an innovative technological development needed to go further in some essential points like material selection and characterization, as well as OTFT electrical characterization and performance enhancement. A special effort was dedicated to novel conductive and semiconductive material-based ink development to reach improved electrical properties. The approach enabled to progress in the technological step definition, development and validation for printed electronic function manufacturing on flexible substrate. In fact, we developed a simple transistor technology adapted to high-volume printing of transistors optimized in terms of electrical performances on all kind of substrates. This work demonstrated in particular that the contact resistance reduction is fundamental and a specific attention is required for source and drain electrode selection. Indeed, low-resistive electrodes 17μΩ.cm printed from silver nanoparticle-based ink do not inevitably confer good performances to the transistor. However, a conducting polymer, Pedot-Pss, a thousand times more resistive, leads to the lowest contact resistances in contact with PQT-12, most competitive -conjugated polymer of this study, due to its higher work function. Furthermore, the results indicated that the contact resistances depending on interface nature, too, and not only on respective material energy levels before contact, according to Mott-Schottky model. By using a multiple-layer substrate with an ultra-thin oxide 4 nm, the flexible printed transistors had low-operating voltages |V|



Author: Mickaël Barret -

Source: https://hal.archives-ouvertes.fr/



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