Since organic semiconductors combine the electronic properties of inorganic materials with the mechanical characteristics of polymers, this class of materials is suitable for solution based large area device preparation techniques. Consequently, inkjet based deposition techniques are highly capable of facing preparation related challenges. By gradually replacing the evaporated electrodes with inkjet printed silver, the preparation related influence onto device performance parameters such as the ON/OFF ratio was investigated with IV measurements and high resolution transmission electron microscopy. Due to the electrode surface roughness the solvent load during the printing of the top electrode as well as organic layer inhomogeneity’s the utilization in array applications is hampered. As a prototypical example a 1diode-1resistor element and a 2×2 subarray from 5×5 array matrix were fully characterized demonstrating the versatility of inkjet printing for device preparation.
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Stefan Sax, Sebastian Nau, Karl Popovic, Alexander Bluemel, Andreas Klug, Emil J. W. List-Kratochvil, "Inkjet-printing of non-volatile organic resistive devices and crossbar array structures," Proc. SPIE 9569, Printed Memory and Circuits, 95690M (17 September 2015);