Modeling the Current–Voltage Characteristics of Ge₁₋ₓSnₓ Electron–Hole Bilayer TFET With Various Compositions

Piotr Wiśniewski , Bogdan Majkusiak


In this article, we present, for the first time, the results of simulation and analysis of the current–voltage characteristics of germanium–tin electron–hole bilayer tunnel field-effect transistor (EHB TFET) of various compositions of the semiconductor substrate. Ge 1−x Sn x is an interesting material due to the possibility of tuning the band structure by changing the Sn content. The direct and indirect bandgap of GeSn can be changed to affect the direct and phonon-assisted band-to-band tunneling currents. In this article, both currents are calculated for various compositions of Ge 1−x Sn x and the channel body thickness as a parameter. The simulated structure exhibits steep-slope current–voltage characteristics due to the reduced carrier dimensionality and the use of 2-D–2-D tunneling as the transport mechanism. Sudden current bumps on characteristics are related to the alignment of the subsequent hole and electron energy levels in the gate-induced surface quantum wells. An increase in the Sn content results in a boost of the ON-current, which is related to the higher magnitude of the direct tunneling current. This effect depends strongly on the body thickness. We show that the application of GeSn in EHB TFET structure can be beneficial in terms of low-power applications.
Author Piotr Wiśniewski (CAMT | MO)
Piotr Wiśniewski,,
- The Centre for Advanced Materials and Technologies
, Bogdan Majkusiak (FEIT / MO)
Bogdan Majkusiak,,
- The Institute of Microelectronics and Optoelectronics
Journal seriesIEEE Transactions on Electron Devices, ISSN 0018-9383, e-ISSN 1557-9646
Issue year2020
Keywords in English2-D carrier gas, electron-hole bilayer tunnel field-effect transistor (EHB TFET), germanium-tin, interband tunneling, quantum mechanical modeling, semiconductor devices, tunnel transistor
ASJC Classification2208 Electrical and Electronic Engineering; 2504 Electronic, Optical and Magnetic Materials
Languageen angielski
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 06-07-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.432; WoS Impact Factor: 2018 = 2.704 (2) - 2018=2.722 (5)
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