High quality Schottky junctions were fabricated on a ZnO (0001) bulk single crystal by spin coating a commercial conducting polymer, poly(3,4- ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS), as the metal electrodes. The junctions exhibited excellent rectifying behavior with a typical ideality factor of 1.2. Such parameters as Schottky barrier height (φb) and built-in potential (Vbi) show negligible variation among junctions. The electron affinity of ZnO derived from φb and q Vbi values show a slight deviation (∼0.2 eV), suggesting the existence of spontaneously formed interfacial dipole layer between ZnO (0001) polar surface and anionic PSS molecules.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)