POLING OF PYROELECTRIC THIN-FILMS

Poling of calcium and zirconium modified lead titanate pyroelelectric thin films has been studied, Poling temperature and electrical field w ere optimized to achieve high figure of merits. It was found that ther mal activation is important to obtain highly poled films. Defect-dipol e complexes are supposed to play a major role to retain the polarizati on and also to enhance it. Porous calcium substituted films achieved a n up to three times higher voltage response than zirconate substituted thin films, because porosity decreased the dielectric constant signif icantly.