Walther Hofherr

Conducting and superconducting salts based on BEDTTTF and on some unsymmetrical tetrachalcogenafulvalenes

Abstract The physical properties of conducting and superconducting salts based on bis(ethylenedithio) tetrathiafulvalene and on some unsymmetrical tetrathiafulvalenes (containing ethylenedithio-,ethylenedioxy-,vinylenedithio-,dimethylethylenedithio-, and pyrazino- as additional heterogroups) are reportd. β-, υ-, and τ-phases are found to be the most important.

Transparent electrically conductive composite materials: Methods of preparation and their application

One possibility to obtain transparent, electrically conductive materials is the crystallization of conducting charge-transfer-complexes (CT-complexes) in a polymer matrix in the form of needle-or dendrite-like structures. With tetraselenotetracene chloride ((TSeT)2Cl), a radical cation salt, as electroconductive filler, we have access to a thermally stable, highly conductive material, with values of the bulk conductivity of the composite material up to 1 S/cm at a loading of the conductive complex below 1 %(w/w). The preparation of such composite structures as free standing (cast) films and in the form of very thin coated layers is presented and their electrical, optical and mechanical properties are discussed. In addition we show their potential use for display electrodes, transparent heating elements, and for antistatic applications.