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Title: Establishing the role of ferroelectric interfaces on nanoscale current and potential distributions
Author: Douglas, Alan Michael
ISNI:       0000 0004 6057 4559
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2016
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New aspects of ferroelectric materials have recently been discovered through the use of conductive atomic force microscopy, inspiring a number of exciting nanoscale research areas which fall broadly into two main topics: conducting domain walls and conduction due to domains themselves. Domain walls exist between regions of similarly aligned polarisation (domains), and are able to be created, moved and removed through the use of an applied electric field. Envisioned devices use the enhanced conductivity along with their re-writeable nature to form domain wall transistors or memristors. Equally, conduction due to domains has been utilised to form tunnel junctions, where the local orientation of polarisation determines the tunnel barrier height. The understanding of these conducting features is still in development; in light of this, research in this thesis is aimed at understanding how polarisation can affect nanoscale conduction and potential distributions at ferroelectric interfaces. Investigations were carried out on ceramics of doped barium titanate used in positive temperature coefficient of resistivity devices. These ceramics readily display a semiconductive behaviour at room temperature while remaining ferroelectric, providing a perfect platform to investigate various interface related effects.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available