Low operating voltage organic transistors and circuits with anodic titanium oxide and phosphonic acid self-assembled monolayer dielectrics |
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| Affiliation: | 1. Electrical and Electronic Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Department of Soft Matter Physics, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria;3. Thin-Film Device Laboratory, RIKEN, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan;4. Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan;1. Department of Physics and Electronics, Osaka Prefecture University, Sakai, 599-8531, Japan;2. The Research Institute for Molecular Electronic Devices, Osaka Prefecture University, Sakai, 599-8531, Japan;1. Department of Advanced Materials Science, Graduate School of Frontier Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan;2. Electroplating Engineers of Japan Ltd., 5-50 Shinmachi, Hiratsuka, Kanagawa 254-0076, Japan;3. Toppan Forms Co., Ltd., 1-7-3 Higashi Shimbashi, Minato-ku, Tokyo 105-8311, Japan;4. Asahi Glass Co., Ltd., 1-5-1 Marunouchi, Chiyoda-ku, Tokyo 100-8405, Japan;5. Technology Research Institute of Osaka, 2-7-1 Ayumino, Izumi, Osaka 594-1157, Japan |
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| Abstract: | We fabricated organic thin-film transistors (OTFTs) with sub-1 V driving voltage enabled by a hybrid dielectric comprising high-k amorphous titanium oxide (TiOx) and a phosphonic acid self-assembled monolayer (SAM). The p-type OTFTs show a high on/off ratio (105), a near 0 V threshold voltage (?0.09 V), and a high mobility of 1.2 cm2/Vs when operated at 1 V. These OTFTs are readily employed in circuit applications, and we show pseudo-CMOS and CMOS inverters operating at 0.5 V as basic building blocks of low-voltage advanced organic logic circuits. We fabricate a five-stage CMOS ring oscillator that displays clear oscillation characteristics at a driving voltage of 0.5 V to highlight the potential of our hybrid dielectric for ultra-low-voltage integrated plastic circuitry. |
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| Keywords: | Organic thin-film transistors Low driving-voltage Ring oscillators |
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