Improvement in electrical characteristics of Silicon on Insulator (SOI) transistor using Graphene material

Karbalaei, M., Dideban, D. and Heidari, H. (2019) Improvement in electrical characteristics of Silicon on Insulator (SOI) transistor using Graphene material. Results in Physics, 15, 102806. (doi: 10.1016/j.rinp.2019.102806)

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This paper presents the electrical characteristics of a short channel Silicon on Insulator (SOI) transistor with a graphene layer. The graphene sheet is used at the bottom of the channel close to the source side and a proportionally heavily p-type retrograde doping implanted in nearly middle of the channel. To increase the gate electrostatic control over the channel we incorporated a high-K material i.e. HfO2 as the gate oxide insulator. Due to Graphene growth and Retrograde Doping in the Channel, we called this structure “GRDC-SOI” transistor. Because graphene sheet has low band gap and high mobility, we used it to increase the on-state current. Engineered p-type retrograde doping utilized for both decreasing off-state current and increasing on-state current. These dopants cause impurity scattering in the depth of the channel and deflect electron movements and decrease off-current. On the other hand, these dopants which are located almost in the middle of the channel can play the role of base in an NPN Bipolar Junction Transistor (BJT), and turn it on and exceed the on-state current. An immense comparison among our proposed device and a device similar to GRDC-SOI but without Graphene sheet (RDC-SOI) and a conventional structure shows that our proposed device has superior electrical characteristics in terms of ION/IOFF ratio, transconductance, subthreshold slope, leakage current, breakdown voltage and short channel effects like hot carriers injection and DIBL. Our analyses demonstrate that GRDC-SOI transistor can open a window for utilizing Graphene material in digital circuits and system on chip applications.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Heidari, Professor Hadi
Authors: Karbalaei, M., Dideban, D., and Heidari, H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Results in Physics
ISSN (Online):2211-3797
Published Online:13 November 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Results in Physics 15:102806
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
300137Impact Acceleration Account - University of Glasgow 2017Jonathan CooperEngineering and Physical Sciences Research Council (EPSRC)EP/R511705/1Research and Innovation Services