Preparation and photo-induced properties of lead lanthanum zirconate titanate multilayers

This paper reports on the formation of multilayer structures and the highly improved photo-induced output current of the lead lanthanum zirconate titanate (PLZT) employed. The photo-induced effect of ferroelectrics has the advantage of simple mechanisms of non-bias applications, which are indispensable for semiconductor p-n junctions. But the output current of PLZT bulk is too low for it to be used as a device current source. The new design is described using an upper transparent indium tin oxide electrode. The PLZT film structure exhibited an output current of the order of microamperes upon light illumination. The photo-induced current of the PLZT film was more than 102 times that of bulk PLZT. These differences are due to the characteristics of the design of the multilayers including the configuration of the electrode. The PLZT film also has the advantage of easy output control and suitability for use on Si. A simple model is used for an illustratative explanation of the improved photo-induced effect in the PLZT film. Results show that the photo-induced effect of the ferroelectric multilayer is useful as the current source for micro-electro-mechanical systems.

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