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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Georgakopoulos-Paltidis, Vasileios | en |
| dc.contributor.author | Γεωργακόπουλος-Παλτίδης, Βασίλειος | el |
| dc.date.accessioned | 2022-12-16T07:22:36Z | - |
| dc.date.available | 2022-12-16T07:22:36Z | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/32224 | - |
| dc.identifier.uri | http://dx.doi.org/10.26268/heal.uoi.12036 | - |
| dc.rights | Attribution-NonCommercial-NoDerivs 3.0 United States | * |
| dc.rights | info:eu-repo/semantics/openAccess | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/us/ | * |
| dc.subject | Optoelectronics | en |
| dc.subject | Photodetectors | en |
| dc.subject | Photo-thermo-electric effect | en |
| dc.subject | Graphene | en |
| dc.subject | Οπτοηλεκτρονική | el |
| dc.subject | Φωτοανιχνευτές | el |
| dc.subject | Φώτο -θέρμο-ηλεκτρικό φαινόμενο | el |
| dc.subject | Γραφένιο | el |
| dc.title | Theoretical analysis and design of integrated split-gate graphene photodetectors | en |
| dc.title | Θεωρητική ανάλυση και σχεδιασμό ολοκληρωμένων φωτοανιχνευτών γραφενίου γεωμετρίας διπλής πύλης | el |
| dc.type | info:eu-repo/semantics/masterThesis | * |
| heal.type | masterThesis | - |
| heal.type.en | Master thesis | en |
| heal.type.el | Μεταπτυχιακή εργασία | el |
| heal.classification | Optical detectors | - |
| heal.dateAvailable | 2022-12-16T07:23:36Z | - |
| heal.language | en | - |
| heal.access | free | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Πολυτεχνική Σχολή. Τμήμα Μηχανικών Επιστήμης Υλικών | el |
| heal.publicationDate | 2022 | - |
| heal.bibliographicCitation | Βιβλιογραφία: σ. 65-68 | el |
| heal.abstract | The aim of this thesis is to investigate by theoretical means the physical mechanisms and working principles of integrated split-gate graphene photodetectors with the aim of designing novel state of the art devices. The recent surge in data traffic volumes creates a demand for more power efficient, complementary metal oxide (CMOS) compatible, high-speed optical communications. Traditional semi-conductor photodetectors fail in simultaneously addressing all these requirements facing issues in integration, complexity and spectral limitations while already being mature technologies. Graphene is a novel 2D material possessing broadband tunable light-matter interactions and exceptional charge transferring properties, properties that render it popular as an active layer in optoelectronic devices. Graphene based photodetection is promising satisfying most of these requirements with the major shortcoming being low power efficiency, described by figures of merit such as voltage-current responsivity RV-RI. Optical absorption in graphene results in energy transfer to the electronic system creating a thermalized hot carrier distribution. Due to an electron-phonon relaxation bottleneck graphene is able to de-couple its electronic temperature from the lattice resulting in a strong photo-thermoelectric effect (PTE), ideal for unbiased photodetection applications. Enhancing optical absorption is key to optimizing performance. Integrated photonic devices involve multiple optically active components (WGs, gates, contacts) arranged in complex photodetection schemes resulting in dynamic absorption-loss phenomena. To account for these, we perform 3D finite difference time domain (FDTD) simulations to obtain the optical absorption distribution and understand the sources of parasitic loss for a given device geometry. The same geometric parameters affect the electronic behavior of the device entangling absorption and thermoelectric effects. To explore the rich physics of the thermoelectric phenomena in a device with non-uniform absorption, temperature and charge density distributions, tools are developed, namely numerical solutions for the Poisson equation governing the static charge density and the thermoelectric equation governing heat and charge transport inside the active layer. The combined tools are then used to explore the impact of different geometric parameters on device performance, successfully simulating experimental results, addressing debated topics cited in literature and laying out a complete framework for studying device photo-thermo-electric phenomena in graphene. | en |
| heal.advisorName | Λοιδωρίκης, Ελευθέριος | el |
| heal.committeeMemberName | Λοιδωρίκης, Ελευθέριος | el |
| heal.committeeMemberName | Λέκκα, Χριστίνα | el |
| heal.committeeMemberName | Παπαγεωργίου, Δημήτριος | el |
| heal.academicPublisher | Πανεπιστήμιο Ιωαννίνων. Πολυτεχνική Σχολή. Τμήμα Μηχανικών Επιστήμης Υλικών | el |
| heal.academicPublisherID | uoi | - |
| heal.numberOfPages | 98 σ. | - |
| heal.fullTextAvailability | true | - |
| Appears in Collections: | Διατριβές Μεταπτυχιακής Έρευνας (Masters) - ΜΕΥ | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Μ.Ε. ΓΕΩΡΓΑΚΟΠΟΥΛΟΣ-ΠΑΛΤΙΔΗΣ ΒΑΣΙΛΕΙΟΣ 2022.pdf | 4.66 MB | Adobe PDF | View/Open |
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