Nanoscale domain patterns and a concept for an energy harvester

摘要: The current work employs a phase-field model to test the stability of nanoscale periodic domain patterns, and explore application one pattern in an energy harvester device. At first, several patterns with in-plane polarizations is tested under stress-free electric field-free conditions. It found that simple stripe-like features are stable, while more complex configurations typically unstable at nanoscale. Upon identifying stable suitable properties, conceptual design thin film device explored. modelled as ferroelectric bound substrate. In initial state stripe zero net charge on top electrode modelled. On bending substrate, mechanical strain induced film, causing polarized domains undergo switching thus generate electrical energy. results demonstrate working cycle which, operating kHz frequencies, such from vibrations environment, could produce area power density about 40W/m2.