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.
@article{arxiv.1104.4449,
title = {Complementary-like Graphene Logic Gates Controlled by Electrostatic Doping},
author = {Song-Lin Li and Hisao Miyazaki and Michael V. Lee and Chuan Liu and Akinobu Kanda and Kazuhito Tsukagoshi},
journal= {arXiv preprint arXiv:1104.4449},
year = {2011}
}