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Hybrid interfaces in polymer-based electronics
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry .
2001 (English)In: Synthetic metals, ISSN 0379-6779, E-ISSN 1879-3290, Vol. 121, no 1-3, 1625-1628 p.Article in journal (Refereed) Published
Abstract [en]

Sandwich-style interfaces of Al/LiF/poly(9,9-dioctyl-fluorene) and A1/CsF/poly(9,9-dioctyl-fluorene) have been studied using X-ray and ultraviolet photoelectron spectroscopy. In the case of LiF-deposition on poly(9,9-dioctyl-fluorene) films, doping did not occur, nor did the LiF dissociate upon Al-deposition. No significant shifts in binding energy of the core levels, or any changes in the work function were detected. However, for the Al/LiF/poly(9,9-dioctyl-fluorene) interface, there was no degradation of the p-electronic structure, unlike the case for Al deposited directly unto poly(9,9-dioctyl-fluorene). For the Al/CsF/poly(9,9-dioctyl-fluorene) interface, the CsF dissociated upon Al deposition, with the Cs likely n-doping the polymer at the interface. When deposited onto an Al surface, CsF also was found to dissociate at the interface but remaining in the CsF form away from the Al surface. Vacuum level alignment occurs for poly(9,9-dioctyl-fluorene) films spun onto 'metal' substrates. The hole-injection barrier in poly(9,9-dioctyl-fluorene)-based LEDs is hence determined by the difference between anode work function and the polymer ionization potential.

Place, publisher, year, edition, pages
2001. Vol. 121, no 1-3, 1625-1628 p.
Keyword [en]
Light sources, Organic/inorganic interfaces, Photoelectron spectroscopy, Polyfluorene
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47440DOI: 10.1016/S0379-6779(00)00698-6OAI: oai:DiVA.org:liu-47440DiVA: diva2:268336
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Salaneck, William RFahlman, Mats

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