Comparison of Electrical Properties of Pb0.95La0.05Zr0.54Ti0.46O3 Thin Film Capacitors Using Coplanar and Interplanar Electrode Configuration

Metal/ferroelectric/metal capacitors were fabricated using ferroelectric thin films of Pb0.95La0.05Zr0.54Ti0.46O3 center dot Pb0.95La0.05Zr0.54Ti0.46O3 films were deposited on Pt/Si substrate using chemical solution deposition method and Au metal electrodes were vacuum deposited on top of these films using a shadow mask. Electrical properties of these capacitors measured in two different electrode configurations, coplanar (Au/PLZT/Au) and interplanar (Au/PLZT/Pt) showed different behavior. For coplanar electrode configuration, higher values of polarization and photovoltaic parameters were obtained under illumination. The studies suggest that both the polarization-induced electric field and interface electric field increase for coplanar configuration, which enhance the transport of photogenerated charge carriers. Electrical poling further improves the photovoltaic parameters of the capacitors, with higher values obtained from the coplanar electrode configuration. Thus, for ferroelectric based photovoltaics devices, coplanar electrode configuration combined with poling enhances the photovoltaic parameters.