High electron mobility in bipolar composites of organic molecules

Electron and hole mobilities in bipolar molecular composites of N,N′‐bis(1,2‐dimethyl‐ propyl)‐1,4,5,8‐naphthalenetetracarboxylic diimide (NTDI) and tri‐p‐tolylamine (TTA) are reported. The electron mobility in NTDI/TTA composites is found to be enhanced by factors of 4 to 6 compared to pure NTDI. These results demonstrate a new approach to improving electron mobility in organic materials.