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Current-voltage characteristics of the Schottky photodiode with a Pt Schottky semitransparent electrode on the Zn surface (Zn-polar) and O surface (O-polar).
Measured value of as a function of applied voltage at . The solid line shows the theoretical values with and at .
Spectral responsivity of the photodiodes for the Zn-polar and O-polar samples.
Optical micrographs of (a) Zn-polar and (b) O-polar surfaces of ZnO substrates after etching in HCl solution for at .
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