Materials study of organic electronics

• The electronic structure of materials for use in organic electronics is studied in this thesis. The first part includes applied research in the form of studies of polymers for use in polymer light emitting devices. The second part is more directed toward organic based spintronics and contains research regarding a room temperature organic ferrimagnetic material. Common for the studies, apart from that all regard organic material, are the use of electron spectroscopy techniques. The studies give new spectroscopic evidence of how the energy level alignment occurs between electrical conductors and spin coated semiconducting polymers, i.e. alignment at the anode side of polymer light emitting devices. The studies prove theoretical predictions regarding spontaneous charge injection forming positive polaronic species in the semiconducting polymer, pinned to the Fermi level of the substrate. The first part also includes studies of novel conducting polymers, based on PEDOT and polyaniline, with work functions spanning from 4.2 eV to 6.4 eV. In the case of organic magnets, our design and construction of the purpose built vacuum deposition system allowed for the first time oxygen free films of the extremely reactive organic ferrimagnet, vanadium tetracyanoethylene (V(TCNE)x), to be studied by means of several different electron spectroscopies, proving or disproving several previous results and assumptions.

Nyckelord

TECHNOLOGY

TEKNIKVETENSKAP

Publikations- och innehållstyp

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