53.3: Influence of Material Purification by Vacuum Sublimation on Organic Optoelectronic Device Performance

In organic optoelectronic devices, in particular organic solar cells and organic electroluminescent devices, reduction of impurities is a critical issue. A frequently used process for oligomers (small-molecules) is sublimation. We demonstrate that the sublimation process is effective to purify organic molecular compounds. Examples are shown for simplified device structures that allow easy evaluation of the impurity effect. New compact vacuum sublimation systems have been developed to process and handle material volumes in excess of 200 cm3.