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Mathematics 2017, 5(4), 68; doi:10.3390/math5040068

Channel Engineering for Nanotransistors in a Semiempirical Quantum Transport Model

1
Department of Physics, Brandenburgische Technische Universität Cottbus/Senftenberg, Fakultät 1, Postfach 101344, 03013 Cottbus, Germany
2
Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovanická 10, 162 53 Praha 6, Czech Republic
3
Gesellschaft zur Förderung von Wissenschaft und Wirtschaft Frankfurt, Im Technologiepark 1, 15236 Frankfurt (Oder), Germany
4
Globalfoundries Dresden, Wilschdorfer Landstraße 101, 01109 Dresden, Germany
*
Author to whom correspondence should be addressed.
Received: 28 September 2017 / Revised: 10 November 2017 / Accepted: 14 November 2017 / Published: 22 November 2017
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Abstract

One major concern of channel engineering in nanotransistors is the coupling of the conduction channel to the source/drain contacts. In a number of previous publications, we have developed a semiempirical quantum model in quantitative agreement with three series of experimental transistors. On the basis of this model, an overlap parameter 0 C 1 can be defined as a criterion for the quality of the contact-to-channel coupling: A high level of C means good matching between the wave functions in the source/drain and in the conduction channel associated with a low contact-to-channel reflection. We show that a high level of C leads to a high saturation current in the ON-state and a large slope of the transfer characteristic in the OFF-state. Furthermore, relevant for future device miniaturization, we analyze the contribution of the tunneling current to the total drain current. It is seen for a device with a gate length of 26 nm that for all gate voltages, the share of the tunneling current becomes small for small drain voltages. With increasing drain voltage, the contribution of the tunneling current grows considerably showing Fowler–Nordheim oscillations. In the ON-state, the classically allowed current remains dominant for large drain voltages. In the OFF-state, the tunneling current becomes dominant. View Full-Text
Keywords: nanotransistor; channel engineering; quantum transport; contact-to-channel coupling; wave function overlap; tunneling current nanotransistor; channel engineering; quantum transport; contact-to-channel coupling; wave function overlap; tunneling current
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wulf, U.; Kučera, J.; Richter, H.; Horstmann, M.; Wiatr, M.; Höntschel, J. Channel Engineering for Nanotransistors in a Semiempirical Quantum Transport Model. Mathematics 2017, 5, 68.

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