We report on the electrical and interfacial properties of nonalloyed Ti/Au ohmic and Pt Schottky contacts on Zn-terminated n-ZnO (1:5 Â 10 17 cm À3). Nonalloyed Ti/Au and Pt contacts on the Zn-terminated ZnO respectively exhibit ohmic and Schottky behavior owing to different work functions and out-diffusion characteristics. The nonalloyed Ti/Au contact reveals very linear current-voltage behavior with a specific contact resistivity of 2:2 Â 10 À5 cm 2. However, Pt contact shows Schottky behavior with Schottky barrier heights (SBHs) of 0.62 eV and 0.78 eV, obtained from current-voltage (I-V) and capacitance-voltage (C-V) measurements, respectively. Using Auger electron spectroscopy (AES), we correlated the electrical properties of the nonalloyed Ti/Au ohmic and Pt Schottky contacts with the properties of the interface between the metal and ZnO.