Non-dispersive and air-stable electron transport in an amorphous organic semiconductor

We report the electron transport properties of an amorphous organic semicon ductor based on silole derivatives. The observed non-dispersive and fast el ectron transport suggests that electron trapping due to energetic disorder is very small. Based on the mobility measurements in air we conclude that o xygen does not function as a significant electron trap. The observed excell ent electron transport properties of this silole derivative are attributed to a large electron affinity originating from its sigma*-pi* conjugation an d a high aromaticity of its anionic species. (C) 2001 Elsevier Science B.V. All rights reserved.