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Complementary-like Graphene Logic Gates Controlled by Electrostatic Doping

By Song-Lin Li, Hisao Miyazaki, Michael V. Lee, Chuan Liu, Akinobu Kanda and Kazuhito Tsukagoshi

Abstract

Realization of logic circuits from graphene is very attractive for high-speed nanoelectronics. However, the intrinsic ambipolar nature hinders the formation of graphene logic devices with the conventional complementary architecture. Using electrostatic doping modulation, we show here a facile method to control the charge neutrality points and form a complementary-like structure, in which the ambipolar conduction is used as a benefit rather than a drawback to construct logic devices. A band gap is also introduced in the channels to improve the switching ratio of the graphene transistors. For the first time, complementary-like NOR and NAND logic gates were demonstrated. This method provides a possible route for logic circuits from ambipolar graphene and, in principle, can be also extended to other ambipolar semiconductors, such as organic compounds and carbon nanotube thin films.Comment: 16 pages, 7 figure

Topics: Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Year: 2011
DOI identifier: 10.1002/smll.201100318
OAI identifier: oai:arXiv.org:1104.4449
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