Regensburg 2007 – scientific programme
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.48: Poster
Tuesday, March 27, 2007, 18:00–20:00, Poster B
Formation of metallic indium-phase from indium tin oxide-nanoparticles under reducing conditions and its influence on the electrical properties — •Gerrit Günther1, Gabi Schierning1, Ralf Theissmann1, Robert Kruk1, Charsten Bähtz2, and Roland Schmechel1 — 1Institute of Nanotechnology, Forschungszentrum Karlsruhe, D-76021 Karlsruhe — 2HASYLAB at DESY, D-22603 Hamburg
Tin doped indium oxide (ITO) acts as a transparent electrode in numerous organic electro-optical devices. Thin films of ITO-nanoparticles were heat-treated under reducing atmosphere. A significant improvement in conductivity of three orders of magnitude was hereby observed in the range between 350°C to 650°C, where no sintering took place, yet. This is a well known but little discussed fact for this electrode material thus motivating the investigation of ITO-nanoparticles in different gaseous atmospheres. Insitu synchrotron-XRD experiments were conducted in argon-, oxygen- and hydrogen-gas at temperatures between 25°C and 450°C. Complementary exsitu susceptibility measurements were carried out with reduced samples which were kept under inert conditions after preparation. The results revealed the formation of a metallic indium-tin-phase even under weakly reducing conditions. This metallic phase is expected to have a crucial influence on the thin films electrical and optical properties. It most likely explains the drastic increase of conductivity in the temperature region between 350°C and 650°C.