Preparation and Photovoltaic Properties of Lead Lanthanum Zirconate Titanate in Design of Multilayers

Abstract

In this paper, we report on the formation of multilayer structures and the highly improved photovoltaic output current of the lead lanthanum zirconate titanate (PLZT) film employed. The photovoltaic effect of ferroelectrics has the advantage of simple mechanisms of nonbias applications, which are indispensable for semiconductor p-n junctions. However, the output current of PLZT bulk is too low for use as a device current source. The new design is described using an upper transparent indium tin oxide (ITO) electrode. The PLZT film structure exhibits a µA output current upon light illumination. The photovoltaic current of the PLZT film is more than 102 times that of the bulk PLZT. These differences are due to the characteristics of the design of multilayers including the configuration of the electrode. The PLZT film also has the advantages of easy output control and suitability for use on a Si substrate. A simple model is used for an illustrative explanation of the improved photovoltaic effect of the PLZT film. Results show that the photovoltaic effect of the ferroelectric multilayer is useful as the current source for a micro-electro-mechanical system (MEMS).

Photovoltaic effects in BiFeO3

“…[8][9][10][11] Recently the highest power-conversion efficiencies ͑0.28% for narrow-band ultraviolet light, which corresponds to ϳ0.005% efficiency under sunlight͒ for ferroelectric thin films were reported in a La-doped PZT-based device. 11 The efficiency of such systems, however, remains small as a direct consequence of the relatively large band gaps of these materials although there have been proposed structures to address such limitations.…”

Development of a Ceramic-Controlled Piezoelectric of Single Disc for Biomedical Applications

“…In this use a translucent sample is put on the free ceramic face named opacity sensor (OPS) whilea frequency modulated light beam is applied, the obtained signal is analyzed and photovoltaic current related with the sample opacity is obtained the signal getting without sample is considered as 100% and the signal with sample which diminish by the sample opacity and thickness is related as a percentage, Figure 11 shows the experimental setup used for this application. (Ichiki et al, 2005;Ichiki et al, 2006;Suaste et al, 2009). Since the CCP has not plane response curve it is necessary to get its characteristic curve in order to have a reference curve that help us to normalize the response, Figure 12 shows the CCP response without sample.…”

Ceramic-Controlled Piezoelectric: Development, Applications and Potentiality in Electrical and Biomedical Engineering.

“…When the PLZT is illuminated after poling, voltage and current can be generated due to the separation of photo induced electron and holes by its internal electric field. This is because the photovoltaic effect occurs within the material and is considered to be an optical property of the material itself and show application potentials for realizing energy transfer in micro electromechanical systems and optoelectronic devices (Sturman & Fridkin, 1992;Ichiki et al, 2004Ichiki et al, , 2005.…”