2012, pp 405-459
Date: 13 Oct 2011

Defect Control and Properties in Bismuth Layer Structured Ferroelectric Single Crystals

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Abstract

The static and dynamic behaviors of ferroelectric domains are the underlying basis of various functional properties of ferroelectric materials, such as dielectricity, piezoelectricity, ferroelectricity, and electro-optic and acoustic-optic effects. Since the performance of ferroelectric devices is governed by these behaviors, various techniques for enhancing device performance have been widely investigated with the aim of controlling ferroelectric domains [19, 20, 88, 109]. Such control, however, is often prevented not only by a large leakage current but also by undesirable behaviors such as domain clamping [16, 73, 95], fatigue [17, 98], aging [63, 68], imprinting [110], and depoling [98]. Ferroelectric devices thus suffer from degraded polarization and poor reliability due to insufficient control over ferroelectric domains. It is considered that the poor polarization properties, fatigue, and aging, etc. are governed by the interaction between defects and ferroelectric domains.