X-ray spectroscopic studies of the electronic structure of chromium based p-type transparent conducting oxides
Citation:
NORTON, EMMA, X-ray spectroscopic studies of the electronic structure of chromium based p-type transparent conducting oxides, Trinity College Dublin.School of Physics.PHYSICS, 2018Download Item:
ENThesistoprint.pdf (Accepted for publication (author's copy) - Peer Reviewed) 46.55Mb
Abstract:
In this thesis the electronic, optical, electrical, and mechanical properties of two
p-type transparent conducting oxides will be explored, primarily by spectroscopic
techniques. The initial chapters outline how the properties of high optical
transparency and electrical conductivity can co-exist in a material. The most
industrially relevant subset of these materials, n-type transparent conducting
oxides, are pervasive in optoelectronics. The p-type counterparts suffer from
inferior properties.
Two of these p-type transparent conducting oxides were analysed by a variety of
spectroscopic techniques: x-ray absorption spectroscopy, x-ray photoelectron
spectroscopy and resonant photoemission spectroscopy. The consensus from this
spectroscopic analysis led the author to conclude that the origin of the low
mobility within chromium based oxides is due to the presence of the common
element chromium. Studies on a novel p-type oxide nanocrystalline CuxCrO2
indicated the highly conductive nature of the films is linked to the presence of
copper vacancies within the material.
Despite the low mobility of some p-type oxides they have found applications
within electronic devices. An experimental technique that can probe the energy
band alignment of two materials will reveal that Cr2−xMgxO3 has the appropriate
energy band alignment with the anode ITO in an organic solar cell to be an
efficient selective contact for the extraction of holes from the cell. It also reveals
that the room temperature deposition of Cr2−xMgxO3 and ZnO creates a
rectifying diode but a large amount of defect states exist at the interface, creating
a high ideality factor of all the diodes manufactured within this work. Finally,
the resilience of copper deficient CuCrO2 to mechanical strain shows it has
promise as a large area transparent flexible electrode.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
Irish Research Council (IRC)
Author's Homepage:
http://people.tcd.ie/nortonemDescription:
APPROVED
Author: Norton, Emma
Advisor:
Fleischer, KarstenPublisher:
Trinity College Dublin. School of Physics. Discipline of PhysicsType of material:
ThesisAvailability:
Full text availableLicences: