Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: POSTER: Biological Systems + New Materials
CPP 20.19: Poster
Wednesday, March 28, 2007, 16:00–18:30, Poster B
DC Electrical Transport through Metallic Nanostructures — •Radim Křenek1, Věra Cimrová2, and Manfred Stamm1 — 1Leibniz Institute of Polymer Research Dresden, Germany — 2Institute of Macromolecular Chemistry AS CR, Prague, Czech Republic
Diblock copolymer nanotemplates provide a prospective way for development of ordered patterns of nanoobjects with e.g. magnetic (hard disks) or optoelectronic (LEDs, photovoltaic cells) functionality. Thin films of diblock copolymer enriched by a low molar mass additive are casted on conductive surfaces in order to ensure good electrical contact for electroplating of magnetic materials or optoelectronic devices. Extraction of the additive results in a porous nanostructure, but quality (depth) of the pores is very sensitive to the substrate roughness. As well, appearance of the top electrode depends on the applied material, technique and ambient conditions. We demonstrate various electrical transport regimes in relation with the roughness of the bottom electrode and the cluster size, loading rate, etc. of the sputtered metal applied for the top electrode. These transport regimes (injection limited currents, space charge limited currents, tunneling) are discussed regarding vertical profiles of the films.