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Graphene field effect transistor without an energy gap

Jang, Min Seok and Kim, Hyungjun and Son, Young-Woo and Atwater, Harry A. and Goddard, William A., III (2013) Graphene field effect transistor without an energy gap. Proceedings of the National Academy of Sciences of the United States of America, 110 (22). pp. 8786-8789. ISSN 0027-8424. PMCID PMC3670380. doi:10.1073/pnas.1305416110.

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Graphene is a room temperature ballistic electron conductor and also a very good thermal conductor. Thus, it has been regarded as an ideal material for postsilicon electronic applications. A major complication is that the relativistic massless electrons in pristine graphene exhibit unimpeded Klein tunneling penetration through gate potential barriers. Thus, previous efforts to realize a field effect transistor for logic applications have assumed that introduction of a band gap in graphene is a prerequisite. Unfortunately, extrinsic treatments designed to open a band gap seriously degrade device quality, yielding very low mobility and uncontrolled on/off current ratios. To solve this dilemma, we propose a gating mechanism that leads to a hundredfold enhancement in on/off transmittance ratio for normally incident electrons without any band gap engineering. Thus, our saw-shaped geometry gate potential (in place of the conventional bar-shaped geometry) leads to switching to an off state while retaining the ultrahigh electron mobility in the on state. In particular, we report that an on/off transmittance ratio of 130 is achievable for a sawtooth gate with a gate length of 80 nm. Our switching mechanism demonstrates that intrinsic graphene can be used in designing logic devices without serious alteration of the conventional field effect transistor architecture. This suggests a new variable for the optimization of the graphene-based device—geometry of the gate electrode.

Item Type:Article
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URLURL TypeDescription DOIArticle CentralArticle
Jang, Min Seok0000-0002-5683-1925
Kim, Hyungjun0000-0001-8261-9381
Atwater, Harry A.0000-0001-9435-0201
Goddard, William A., III0000-0003-0097-5716
Additional Information:© 2013 National Academy of Sciences. Contributed by William A. Goddard III, March 22, 2013 (sent for review November 5, 2012). Published online before print May 13, 2013. This work was supported by Department of Energy Light-Material Interactions in Energy Conversion–Energy Frontier Research Center Grant DE-SC0001293 (to M.S.J. and H.A.A.), the National Science Foundation (CMMI-1120890, to W.A.G.), and the Functional Engineered Nano Architectonics via the Microelectronics Advanced Research Corporation with Prime Award 2009-NT-2048 at University of California, Los Angeles (to W.A.G.). H.K. and W.A.G. also acknowledge support from the World Class University programs through National Research Foundation (NRF) of Korea funded by Ministry of Education, Science and Technology (MEST) Grant R31- 2008-000-10055-0. H.K. also is grateful for the support of the Nanomaterial Technology Development Program through the NRF of Korea funded by MEST Grant 2012M3A7B4049807. Y.-W.S. was in part supported by MEST (Grant QMMRC R11-2008-053-01002-0 and Center for Advanced Soft Electronics 2011-0031640). Author contributions: M.S.J., H.K., Y.-W.S., H.A.A., and W.A.G. designed research; M.S.J., H.K., and W.A.G. performed research; M.S.J., H.K., Y.-W.S., H.A.A., and W.A.G. analyzed data; and M.S.J., H.K., Y.-W.S., H.A.A., and W.A.G. wrote the paper.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001293
Microelectronics Advanced Research Corporation (MARCO)2009-NT-2048
National Research Foundation of KoreaUNSPECIFIED
Ministry of Education, Science and Technology (Korea)R31-2008-000-10055-0
Ministry of Education, Science and Technology (Korea)2012M3A7B4049807
Ministry of Education, Science and Technology (Korea)QMMRC R11-2008-053-01002-0
Center for Advanced Soft Electronics2011-0031640
Subject Keywords:electron optics; finite-difference time domain; gate geometry engineering; graphene transistor
Issue or Number:22
PubMed Central ID:PMC3670380
Record Number:CaltechAUTHORS:20130812-153116228
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39881
Deposited By: Tony Diaz
Deposited On:12 Aug 2013 22:59
Last Modified:09 Nov 2021 23:47

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