Communication: n-Type-electron transporting-conduction is demonstrated for Schottky diodes and field effect transistors based on N,N'-diphenyl-3,4,9,10-perylenetetracarboxylic-diimide. The role of the electron-injecting electrode is discussed, as are the potential improvements in performance offered by devices combining a p-type semiconducting layer with an n-type, electron transporting organic compound.