Analiza rezonantne tunelske diode temeljene na grafenskim nanovrpcama s idealnim rubovima

undergraduate thesis

• Title (english): Analysis of a resonant tunneling diode based on graphene nanoribbons with ideal edges
• Author: Mirko Mihaljević
• Mentor: Mirko Poljak (mentor)
• Committee member: Mirko Poljak (predsjednik povjerenstva)
• Committee member: Marko Koričić (član povjerenstva)
• Committee member: Željko Osrečki (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2020-09-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Grafen je 2D materijal s odličnim elektronskim i transportnim svojstvima, ali mu je mana što nema zabranjeni pojas. Jedan od načina dobivanja zabranjenog pojasa je oblikovanje grafena u nanovrpce (GNR) koje se dobiju ograničavanjem širine na nekoliko nanometara. Kombiniranjem grafenskih nanovrpci različitih širina mogu se realizirati lateralne rezonantne tunelske diode. Za analizu ove strukture korišten je kvantni transport (NEGF) s dva kontakta koja su predstavljena pomoću dva polubeskonačna područja. Razmatrala se promjena strujno-naponskih karakteristika GNR RTD-ova u ovisnosti o TQW i TB, te usporedba karakteristika sa SiNR RTD-ovima. Pokazano je da se povećavanjem duljine jame i barijera mogu dobiti bolje karakteristike kod GNR RTD-ova u odnosu na one kod SiNR RTD-ova.

Abstract (english)

Graphene is a 2D material with excellent electronic and transport properties, but its disadvantage is that it does not have a bandgap. One of the approaches for inducing a bandgap is by shaping graphene into nanoribbons (GNR) which are obtained by limiting the width to a few nanometers. By combining graphene nanoribbons of different widths, resonant tunneling diodes can be realized. Quantum transport (NEGF) with two contacts represented by two semi-infinite domains was used to analyze the GNR RTD structures. The change of GNR RTD performance characteristics depending on TB and TQW was analyzed, as well as the comparison with SiNR RTD. It has been shown that by increasing the well and barrier length, better device properties can be obtained with GNR RTDs in comparison to SiNR RTDs.

• Keywords: Rezonantna tunelska dioda; 2D materijali; grafen; silicen; Greenova funkcija; nanovrpce; kvantni transport
• Keywords (english): Resonant tunneling diodes; 2D materials; graphene; silicene; Green's function; nanoribbons; quantum transport
• Language: croatian
• URN:NBN: urn:nbn:hr:168:094857
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-01-14 09:32:50