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Contact spacing controls the on-current for all-carbon field effect transistors

Özdemir, Ali Deniz; Barua, Pramit; Pyatkov, Felix; Hennrich, Frank; Chen, Yuan; Wenzel, Wolfgang; Krupke, Ralph; Fediai, Artem

All-carbon field-effect transistors, which combine carbon nanotubes and graphene hold great promise for many applications such as digital logic devices and single-photon emitters. However, the understanding of the physical properties of carbon nanotube (CNT)/graphene hybrid systems in such devices remained limited. In this combined experimental and theoretical study, we use a quantum transport model for field-effect transistors based on graphene electrodes and CNT channels to explain the experimentally observed low on currents. We find that large graphene/CNT spacing and short contact lengths limit the device performance. We have also elucidated in this work the experimentally observed ambipolar transport behavior caused by the flat conduction- and valence-bands and describe non-ideal gate-control of the contacts and channel region by the quantum capacitance of graphene and the carbon nanotube. We hope that our insights will accelerate the design of efficient all-carbon field-effect transistors.

Verlagsausgabe §
DOI: 10.5445/IR/1000140252
Veröffentlicht am 23.11.2021
DOI: 10.1038/s42005-021-00747-5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2021
Sprache Englisch
Identifikator ISSN: 2399-3650
KITopen-ID: 1000140252
HGF-Programm 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in Communications Physics
Verlag Nature Research
Band 4
Heft 1
Seiten Art.-Nr.: 246
Vorab online veröffentlicht am 18.11.2021
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