Electronic structure and charge injection at interface between electrode and liquid-crystalline semiconductor

The measurement and analysis of the current-voltage characteristics of a liquid-crystalline organic semiconductor 2-(4′-octyphenyl)-6-dodecyloxynaphthalene (8-PNP-O12) in contact with electrodes of Pt, Au, ITO, Cr, and Al (in the order of work function) have revealed that the injection of holes from the electrodes of Pt, Au, and indium tin oxide to 8-PNP-O12 takes place according to the Richardson-Schottky model and that an electric double layer is formed at the interface between each of these electrodes and 8-PNP-O12, making it difficult to inject holes from the former to the latter.