Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Charge Transport in Transition Metal Oxide Thin Films and Electrochromic Devices
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Materials Science.
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Thin film devices for windows, mirrors, space applications and other purposes, have become an essential part of modern technology. A great advantage with a thin film device is the small amount of material used and the compact volume of the device. Dynamic control of thin film device properties is usually obtained by the application of a potential with a resulting charge transport. To understand this charge transport, thus become of great importance to improve, develop, and invent new thin film devices.

Charge transport in transition metal oxide thin films and electrochromic devices have been studied in this thesis using dielectric and electrochemical methods. The dielectric methods used are impedance spectroscopy, the isothermal transient ionic current technique and current-voltage measurements. The electrochemical methods include the galvanostatic intermittent titration technique and electrochemical impedance spectroscopy.

Ion intercalation parameters have been obtained for sputtered and ALD ZrO2 and sputtered TiO2, and the ion conduction processes have been analysed. The dielectric permittivity of as-deposited as well as intercalated thin films of ZrO2 and TiO2 have been studied and electron conduction mechanisms in as-deposited films deduced. From the impedance spectroscopy it is found that the dielectric response changes drastically upon ion intercalation. The complex dielectric response suggests different relaxation processes being important at different levels of intercalation and an explanation built on defect induced dipoles is proposed. Moreover, ion transport in electrochromic devices has been studied. The transient ionic current has been analysed to extract transport parameters both in single layers and whole devices and a deeper understanding of the ionic motion has been achieved.

Place, publisher, year, edition, pages
Uppsala: Materialvetenskap , 2002. , p. 50
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 779
Keywords [en]
Engineering physics
Keywords [sv]
Teknisk fysik
National Category
Other Engineering and Technologies
Research subject
Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-3030ISBN: 91-554-5473-9 (print)OAI: oai:DiVA.org:uu-3030DiVA, id: diva2:162202
Public defence
2002-12-06, Polhemsalen, Uppsala, 09:30 (English)
Opponent
Available from: 2002-11-15 Created: 2002-11-15 Last updated: 2015-09-09Bibliographically approved
List of papers
1. Dielectric study of thin films of Ta2O5 and ZrO2
Open this publication in new window or tab >>Dielectric study of thin films of Ta2O5 and ZrO2
Show others...
2001 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 8, no 4, p. 648-651Article in journal (Refereed) Published
Abstract [en]

Electronic conduction in sputtered Ta2O5 and ZrO2 thin films have been studied using impedance spectroscopy, isothermal transient ionic current, and current-voltage measurements. The dielectric properties of Ta2O5 were shown to be sensitively dependent on deposition parameters with two different frequency responses: a flat loss behavior with very low DC conductivity, or a relaxation peak together with a somewhat higher DC conductivity. ZrO2 has different dielectric properties when fresh, i.e. newly deposited, or aged. A fresh sample arbitrarily can show two different behaviors, consisting of a DC conductivity with a relaxation peak superimposed on it. The DC conductivity shows either of two different values. The aged sample has a lower permittivity and DC conductivity, and the relaxation peak is found at much lower frequencies. Fresh samples of ZrO2 also show switching behavior

National Category
Medical and Health Sciences Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-89904 (URN)10.1109/94.946718 (DOI)
Available from: 2002-05-15 Created: 2002-05-15 Last updated: 2017-12-14Bibliographically approved
2. H+ Conduction Parameters in Solid-State Electrochromic Devices Obtained by ITIC
Open this publication in new window or tab >>H+ Conduction Parameters in Solid-State Electrochromic Devices Obtained by ITIC
(English)In: Solid State IonicsArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-90066 (URN)
Available from: 2002-11-15 Created: 2002-11-15 Last updated: 2009-04-29Bibliographically approved
3. Dielectric properties and current-voltage characteristics of atomic layer deposited ZrO2
Open this publication in new window or tab >>Dielectric properties and current-voltage characteristics of atomic layer deposited ZrO2
Show others...
(English)In: J. of Appl. Phys.Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-90067 (URN)
Available from: 2002-11-15 Created: 2002-11-15 Last updated: 2009-04-29Bibliographically approved
4. Dielectric Permittivity and Intercalation Parameters of Li ion Intercalated Atomic Layer Deposited ZrO2
Open this publication in new window or tab >>Dielectric Permittivity and Intercalation Parameters of Li ion Intercalated Atomic Layer Deposited ZrO2
Show others...
(English)In: J. Electrochem. Soc.Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-90068 (URN)
Available from: 2002-11-15 Created: 2002-11-15 Last updated: 2009-04-29Bibliographically approved
5. Dielectric Permittivity and Intercalation Parameters of Li ion Intercalated Atomic Layer Deposited ZrO2
Open this publication in new window or tab >>Dielectric Permittivity and Intercalation Parameters of Li ion Intercalated Atomic Layer Deposited ZrO2
Show others...
(English)In: J. Electrochem. Soc.Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-90069 (URN)
Available from: 2002-11-15 Created: 2002-11-15 Last updated: 2009-04-29Bibliographically approved
6. Theoretical investigation of ion conduction in three-layered ion-conductor systems: Derivation of the isothermal transient ionic current and frequency-dependent impedance
Open this publication in new window or tab >>Theoretical investigation of ion conduction in three-layered ion-conductor systems: Derivation of the isothermal transient ionic current and frequency-dependent impedance
2003 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 94, p. 1629-Article in journal (Refereed) Published
Abstract [en]

Ion conduction in three-layered ion-conductor systems is considered. Explicit analytic expressions for the isothermal transient ionic current and frequency-dependent impedance are derived. The analysis includes migration, diffusion and space-charge effects as contributors to the ionic motion. The resulting model allows conduction parameters such as diffusion coefficients and ion concentrations in three different layers to be obtained from one single measurement, either in the time or in the frequency domain. The implications of one or more of the layers being mixed ionic/electronic conductors are discussed, and it is argued that the proposed model provides a useful description of the coupled ionic/electronic motion occurring in such a mixed-conductor system.

National Category
Medical and Health Sciences Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-90070 (URN)10.1063/1.1590062 (DOI)
Available from: 2002-11-15 Created: 2002-11-15 Last updated: 2017-12-14Bibliographically approved

Open Access in DiVA

fulltext(576 kB)1811 downloads
File information
File name FULLTEXT01.pdfFile size 576 kBChecksum MD5
2c34ddb0329b8255cfb9f0d910a5fb7a90f231b93df0d45bd2845e7f5a58df67c66ad669
Type fulltextMimetype application/pdf
Buy this publication >>

By organisation
Materials Science
Other Engineering and Technologies

Search outside of DiVA

GoogleGoogle Scholar
Total: 1811 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1501 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf