Piezoelectric Transducers on Curved Dispersive Bending Wave and Poke-Charged Touch Screens

Abstract

Ferroelectric thin films of lead zirconate titanate Pb(Zr_0.52,Ti_0.48)O₃(PZT) and bismuth titanate Bi₄Ti₃O₁₂(BiT) were prepared by photochemical metal-organic deposition as electromechanical transducers used in optoelectronic devices. Both solutions were deposited on flat and convex amorphous glass substrates to poke-charge the device or detect the touch point coordinate on new generation of free-shaped screens. The effects of optimization on UV exposure, precursor type and annealing temperature (600–800 °C) were investigated on microstructural, optical and ferroelectric properties of deposited thin films. Suppressing the non-uniformity of the film thicknesses due to repetitive deposition, actually there is no structural difference between the two types of substrates and their effects on the film properties. Polarization-voltage hysteresis loops showed relatively larger remnant polarization of P _r  = 9.3 µC/cm² and 6.1 µC/cm² for optimized UV-irradiated PZT and BiT thin films, respectively, than uncured samples.

Keywords:

• BiT
• Photolysis
• Piezoelectric
• PMOD
• PZT
• Touchscreen
• Transparency
• UV

Notes

Color versions of one or more of the figures in the article can be found online at www.tandfonline.com/lmmp.