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Low Operating Bias and Matched Input−Output Characteristics in Graphene Logic Inverters

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International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
§ Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
* To whom correspondence should be addressed, [email protected]
Cite this: Nano Lett. 2010, 10, 7, 2357–2362
Publication Date (Web):June 2, 2010
https://doi.org/10.1021/nl100031x
Copyright © 2010 American Chemical Society
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Abstract

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We developed a simple and novel method to fabricate complementary-like logic inverters based on ambipolar graphene field-effect transistors (FETs). We found that the top gate stacks (with both the metal and oxide layers) can be simply prepared with only one-step deposition process and show high capacitive efficiency. By employing such a top gate as the operating terminal, the operating bias can be lowered within 2 V. In addition, the complementary p- and n-type FET pairs can be also simply fulfilled through potential superposition effect from the drain bias. The inverters can be operated, with up to 4−7 voltage gains, in both the first and third quadrants due to the ambipolarity of graphene FETs. For the first time, a match between the input and output voltages is achieved in graphene logic devices, indicating the potential in direct cascading of multiple devices for future nanoelectronic applications.

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Description of top gate stacks fabrication, capacitance and thickness estimations, leakage versus gate bias, and mobility estimation of the single-layer graphene underneath natural alumina layers. This material is available free of charge via the Internet at http://pubs.acs.org.

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