Low-voltage organic transistors with an amorphous molecular gate dielectric

Marcus Halik, Hagen Klauk, Ute Zschieschang, Günter Schmid, Christine Dehm, Markus Schütz, Steffen Malsch, Franz Effenberger, Markus Brunnbauer, Francesco Stellacci

Research output: Contribution to journalArticlepeer-review

Abstract

Organic thin film transistors (TFTs) are of interest for a variety of large-area electronic applications, such as displays, sensors and electronic barcodes. One of the key problems with existing organic TFTs is their large operating voltage, which often exceeds 20V. This is due to poor capacitive coupling through relatively thick gate dielectric layers: these dielectrics are usually either inorganic oxides or nitrides, or insulating polymers, and are often thicker than 100 nm to minimize gate leakage currents. Here we demonstrate a manufacturing process for TFTs with a 2.5-nm-thick molecular self-assembled monolayer (SAM) gate dielectric and a high-mobility organic semiconductor (pentacene). These TFTs operate with supply voltages of less than 2 V, yet have gate currents that are lower than those of advanced silicon field-effect transistors with SiO2 dielectrics. These results should therefore increase the prospects of using organic TFTs in low-power applications (such as portable devices). Moreover, molecular SAMs may even be of interest for advanced silicon transistors where the continued reduction in dielectric thickness leads to ever greater gate leakage and power dissipation.

Original languageEnglish
Pages (from-to)963-966
Number of pages4
JournalNature
Volume431
Issue number7011
DOIs
Publication statusPublished - Oct 21 2004

ASJC Scopus subject areas

  • General

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