Admittance spectroscopy of spray-pyrolyzed ZnO film

A ZnO film was deposited using the spray pyrolysis method. The admittance spectroscopy method was used to establish the contributions to electrical behavior from grains, grain boundaries, and electrodes of film. Proper equivalent electrical circuit of a ZnO film composed of a single parallel resistor, capacitor, and inductor network connected with a series resistance was proposed. Moreover, we displayed metal–semiconductor transition (MST) in the ZnO film via admittance spectroscopy.