Structural and Dielectric Properties of <TEX>$PbTiO_3$</TEX> Ferroelectric Thin Film Prepared by Sol-Gel Processing

,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 30(9); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(9): 695.

Sol-Gel법으로 제조된 $PbTiO_3$ 강유전 박막의 구조적, 유전적 특성

김준한, 백동수, 박창엽

연세대학교 전기공학과

Structural and Dielectric Properties of $PbTiO_3$ Ferroelectric Thin Film Prepared by Sol-Gel Processing

ABSTRACT

In this study, we prepared Pb-Ti stock solution by sol-gel processing and deposited PbTiO3 thin film on a Pt coated SiO2/Si wafer by spin coating using the stock solution. We used lead acetate trihydrate and titanium isopropoxide. The stock solution was partially hydrolized and finally a 0.25M coating solution was prepared. We achieved spin coating at 4000rpm for 30 seconds and heated the thin film at 375$^{circ}C$ for 5 minutes and at $600^{circ}C$ for 5 minutes successively, first and second heating state. And the thin film was finally sintered at 90$0^{circ}C$ for 1 hour in the air. The upper electrode of the thin film was made by gold sputtering and was cricle shape with radius 0.4mm. Measured dielectric constant, dissipation factor and phase transition temperature(Cuire Temp.) were about 275, 0.02 and 521$^{circ}C$ respectively. To observe ferroelectric characteristics we calculated Pr(remnant polarization) and Ec(coercive field) byhysteresis curve. Ec was 72kV/cm and Pr was 11.46$mu$C/$textrm{cm}^2$.