Ozone oxidation methods for aluminium oxide formation : application to low-voltage organic transistors
Gupta, S. and Hannah, S. and Watson, C. P. and Sutta, P. and Pedersen, R. H. and Gadegaard, N. and Gleskova, H. (2015) Ozone oxidation methods for aluminium oxide formation : application to low-voltage organic transistors. Organic Electronics, 21. pp. 132-137. ISSN 1566-1199 (https://doi.org/10.1016/j.orgel.2015.03.007)
Preview |
PDF.
Filename: Gupta_etal_OE2015_ozone_oxidation_methods_for_aluminum_oxide_formation.pdf
Final Published Version License: Download (1MB)| Preview |
Abstract
Four atmospheric pressure ozone oxidation methods were used to produce ultra-thin layers of aluminium oxide for organic thin-film transistors. They are UV/ozone oxidation in ambient (UV-AA) and dry (UV-DA) air, UV/ozone oxidation combined with high-voltage discharge-generated ozone in dry air (UV+O3-DA), and discharge-generated ozone in dry air (O3-DA). The lack of the high-energy UV photons during the O3-DA oxidation led to low relative permittivity and high leakage current density of the AlOx layer that rendered this method unsuitable for transistor dielectrics. Although this oxidation method led to the incorporation of oxygen into the film, the FTIR confirmed an increased concentration of the subsurface oxygen while the XPS showed the highest portion of the unoxidized Al among all four methods. The remaining three oxidation methods produced AlOx films with thicknesses in excess of 7 nm (2-hour oxidation time), relative permittivity between 6.61 and 7.25, and leakage current density of (1-7)x10-7 A/cm2 at 2 MV/cm, and were successfully implemented into organic thin-film transistors based on pentacene and DNTT. The presence of –OH groups in all oxides is below the detection limit, while some carbon impurities appear to be incorporated.
ORCID iDs
Gupta, S., Hannah, S. ORCID: https://orcid.org/0000-0001-5620-9899, Watson, C. P., Sutta, P., Pedersen, R. H., Gadegaard, N. and Gleskova, H. ORCID: https://orcid.org/0000-0001-7195-9639;-
-
Item type: Article ID code: 52114 Dates: DateEvent30 June 2015Published9 March 2015Published Online5 March 2015AcceptedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Pure Administrator Date deposited: 05 Mar 2015 15:13 Last modified: 31 Oct 2024 01:38 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/52114