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Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors
Graphene is an atomically thin two-dimensional (2-D) crystal with unique thermal, mechanical, and electronic transport properties such as the high mobility of carriers, perfect 2- D confinement and linear dispersion, etc., has been attracted many interest as a promising candidate for nano-scale devi...
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| Format: | Thesis |
| Language: | English |
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Department of Electrical Engineering
2019
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| _version_ | 1867613554602934272 |
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| access_status_str | Open Access |
| author | Akbari, Mahmood |
| author2 | Baghai-Wadji, Alireza |
| author_browse | Akbari, Mahmood Baghai-Wadji, Alireza |
| author_facet | Baghai-Wadji, Alireza Akbari, Mahmood |
| author_sort | Akbari, Mahmood |
| collection | Thesis |
| description | Graphene is an atomically thin two-dimensional (2-D) crystal with unique thermal, mechanical, and electronic transport properties such as the high mobility of carriers, perfect 2- D confinement and linear dispersion, etc., has been attracted many interest as a promising candidate for nano-scale devices over the past decades. Multilayer stacks of graphene and other stable, atomically thin, 2-D materials offer the prospect of creating a new class of heterostructure materials. Hexagonal boron- nitride (hBN), is a great candidate to be stacked with graphene due to an atomically 2-D layered structure with a lattice constant very similar to graphene (1.8% mismatch), large electrical band gap (∼4.7eV), and excellent thermal and chemical stability. The graphene/hBN based tunneling transistors show the resonant tunneling and strong negative differential resistance (NDR). These devices which have potential for future high-frequency and logic applications such as high-speed IC circuits, signal generators, data storage, etc., has been studied both theoretically and experimentally recently. The aim in this dissertation has been to study the effect of the uniaxial strain on the graphene nanoribbon resonant tunneling transistors (RTTs). The uniaxial strain may be induced either by an external stress applied to the graphene in a particular direction or by a substrate due to deposition of graphene on top of the other materials. The strain modifies distances between carbon atoms which leading to different hopping amplitudes among neighboring sites. A resonant tunneling transistor consisting of armchair graphene nanoribbon (AGNR) electrodes with three layers of hBN tunnel barrier between them has been considered. By using the nearest-neighbor tight-bind (TB) method and the nonequilibrium Green function (NEGF) formalism, the electronic transport characteristics of a RTT is calculated. In this work, we focus on how the strain affects the current-voltage characteristics of AGNR/hBN RTT. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/29314 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:37:59.997Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/29314 Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors Akbari, Mahmood Baghai-Wadji, Alireza Computational Electronics Graphene is an atomically thin two-dimensional (2-D) crystal with unique thermal, mechanical, and electronic transport properties such as the high mobility of carriers, perfect 2- D confinement and linear dispersion, etc., has been attracted many interest as a promising candidate for nano-scale devices over the past decades. Multilayer stacks of graphene and other stable, atomically thin, 2-D materials offer the prospect of creating a new class of heterostructure materials. Hexagonal boron- nitride (hBN), is a great candidate to be stacked with graphene due to an atomically 2-D layered structure with a lattice constant very similar to graphene (1.8% mismatch), large electrical band gap (∼4.7eV), and excellent thermal and chemical stability. The graphene/hBN based tunneling transistors show the resonant tunneling and strong negative differential resistance (NDR). These devices which have potential for future high-frequency and logic applications such as high-speed IC circuits, signal generators, data storage, etc., has been studied both theoretically and experimentally recently. The aim in this dissertation has been to study the effect of the uniaxial strain on the graphene nanoribbon resonant tunneling transistors (RTTs). The uniaxial strain may be induced either by an external stress applied to the graphene in a particular direction or by a substrate due to deposition of graphene on top of the other materials. The strain modifies distances between carbon atoms which leading to different hopping amplitudes among neighboring sites. A resonant tunneling transistor consisting of armchair graphene nanoribbon (AGNR) electrodes with three layers of hBN tunnel barrier between them has been considered. By using the nearest-neighbor tight-bind (TB) method and the nonequilibrium Green function (NEGF) formalism, the electronic transport characteristics of a RTT is calculated. In this work, we focus on how the strain affects the current-voltage characteristics of AGNR/hBN RTT. 2019-02-05T07:24:50Z 2019-02-05T07:24:50Z 2018 2019-01-31T09:38:58Z Master Thesis Masters MSc http://hdl.handle.net/11427/29314 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Computational Electronics Akbari, Mahmood Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors |
| thesis_degree_str | Master's |
| title | Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors |
| title_full | Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors |
| title_fullStr | Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors |
| title_full_unstemmed | Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors |
| title_short | Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors |
| title_sort | uniaxial strain effect on graphene nanoribbon resonant tunneling transistors |
| topic | Computational Electronics |
| url | http://hdl.handle.net/11427/29314 |
| work_keys_str_mv | AT akbarimahmood uniaxialstraineffectongraphenenanoribbonresonanttunnelingtransistors |