Achieving Good Temperature Stability of Dielectric Constant by Constructing Composition Gradient in (Pb1-x,Lax)(Zr0.65,Ti0.35)O3 Multilayer Thin Films

Ferroelectrics with a high dielectric constant are ideal materials for the fabrication of miniaturized and integrated electronic devices. However, the dielectric constant of ferroelectrics varies significantly with the change of temperature, which is detrimental to the working stability of electronic devices. This work demonstrates a new strategy to design a ferroelectric dielectric with a high temperature stability, that is, the design of a multilayer relaxor ferroelectric thin film with a composition gradient. As a result, the fabricated up-graded (Pb,La)(Zr-0.65,Ti-0.35)O-3 multilayer thin film showed a superior temperature stability of the dielectric constant, with variation less than 7% in the temperature range from 30 degrees C to 200 degrees C, and more importantly, the variation was less than 2.5% in the temperature range from 75 degrees C to 200 degrees C. This work not only develops a dielectric material with superior temperature stability, but also demonstrates a promising method to enhance the temperature stability of ferroelectrics.

Automated summary

This study demonstrates a new strategy to design a ferroelectric dielectric with high temperature stability. By designing a multilayer relaxor ferroelectric thin film with a composition gradient, the temperature stability of the dielectric constant was greatly improved.