Metal Contact Induced Unconventional Field Effect in Metallic Carbon Nanotubes
One-dimensional carbon nanotubes (CNTs) are promising for future nanoelectronics and optoelectronics, and an understanding of electrical contacts is essential for developing these technologies. Although significant efforts have been made in this direction, the quantitative behavior of electrical con...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/11/1774 |
| _version_ | 1797597014692724736 |
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| author | Georgy Fedorov Roohollah Hafizi Vyacheslav Semenenko Vasili Perebeinos |
| author_facet | Georgy Fedorov Roohollah Hafizi Vyacheslav Semenenko Vasili Perebeinos |
| author_sort | Georgy Fedorov |
| collection | DOAJ |
| description | One-dimensional carbon nanotubes (CNTs) are promising for future nanoelectronics and optoelectronics, and an understanding of electrical contacts is essential for developing these technologies. Although significant efforts have been made in this direction, the quantitative behavior of electrical contacts remains poorly understood. Here, we investigate the effect of metal deformations on the gate voltage dependence of the conductance of metallic armchair and zigzag CNT field effect transistors (FETs). We employ density functional theory calculations of deformed CNTs under metal contacts to demonstrate that the current-voltage characteristics of the FET devices are qualitatively different from those expected for metallic CNT. We predict that, in the case of armchair CNT, the gate-voltage dependence of the conductance shows an ON/OFF ratio of about a factor of two, nearly independent of temperature. We attribute the simulated behavior to modification of the band structure under the metals caused by deformation. Our comprehensive model predicts a distinct feature of conductance modulation in armchair CNTFETs induced by the deformation of the CNT band structure. At the same time, the deformation in zigzag metallic CNTs leads to a band crossing but not to a bandgap opening. |
| first_indexed | 2024-03-11T03:00:50Z |
| format | Article |
| id | doaj.art-8d66e0e6015745639e6a515b9bbe6801 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-11T03:00:50Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-8d66e0e6015745639e6a515b9bbe68012023-11-18T08:19:20ZengMDPI AGNanomaterials2079-49912023-05-011311177410.3390/nano13111774Metal Contact Induced Unconventional Field Effect in Metallic Carbon NanotubesGeorgy Fedorov0Roohollah Hafizi1Vyacheslav Semenenko2Vasili Perebeinos3Institute of Photonics, University of Eastern Finland, 999018 Joensuu, FinlandDepartment of Physics and Astronomy and Thomas Young Centre, University College London, London WC1E 6BT, UKDepartment of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USADepartment of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USAOne-dimensional carbon nanotubes (CNTs) are promising for future nanoelectronics and optoelectronics, and an understanding of electrical contacts is essential for developing these technologies. Although significant efforts have been made in this direction, the quantitative behavior of electrical contacts remains poorly understood. Here, we investigate the effect of metal deformations on the gate voltage dependence of the conductance of metallic armchair and zigzag CNT field effect transistors (FETs). We employ density functional theory calculations of deformed CNTs under metal contacts to demonstrate that the current-voltage characteristics of the FET devices are qualitatively different from those expected for metallic CNT. We predict that, in the case of armchair CNT, the gate-voltage dependence of the conductance shows an ON/OFF ratio of about a factor of two, nearly independent of temperature. We attribute the simulated behavior to modification of the band structure under the metals caused by deformation. Our comprehensive model predicts a distinct feature of conductance modulation in armchair CNTFETs induced by the deformation of the CNT band structure. At the same time, the deformation in zigzag metallic CNTs leads to a band crossing but not to a bandgap opening.https://www.mdpi.com/2079-4991/13/11/1774carbon nanotubesballistic transportelectrical contact resistance |
| spellingShingle | Georgy Fedorov Roohollah Hafizi Vyacheslav Semenenko Vasili Perebeinos Metal Contact Induced Unconventional Field Effect in Metallic Carbon Nanotubes Nanomaterials carbon nanotubes ballistic transport electrical contact resistance |
| title | Metal Contact Induced Unconventional Field Effect in Metallic Carbon Nanotubes |
| title_full | Metal Contact Induced Unconventional Field Effect in Metallic Carbon Nanotubes |
| title_fullStr | Metal Contact Induced Unconventional Field Effect in Metallic Carbon Nanotubes |
| title_full_unstemmed | Metal Contact Induced Unconventional Field Effect in Metallic Carbon Nanotubes |
| title_short | Metal Contact Induced Unconventional Field Effect in Metallic Carbon Nanotubes |
| title_sort | metal contact induced unconventional field effect in metallic carbon nanotubes |
| topic | carbon nanotubes ballistic transport electrical contact resistance |
| url | https://www.mdpi.com/2079-4991/13/11/1774 |
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