Lecture "A Way to Enhance Properties of Materials Through Negative Pressure"
Professor Nava Setter, Swiss Federal Institute of Technology – EPFL Lausanne, Switzerland
Professor Nava Setter is 2017/2018 Nirit and Michael Shaoul Fellow of the Mortimer and Raymond Sackler Institute of Advanced Studies.
Strain engineering has been often utilized in thin films to enhance properties. For example, biaxially strained silicon layers exhibit high electron mobility, which is useful in CMOS technology. Less common is strain engineering in free-standing elements / particles and it has not been used so far to modify electrical properties. We developed a way to create negative pressure (tension) in free-standing ferroelectric particles. The pressure proved to sustain for several years. The material, as predicted a decade ago from first principles shows strongly enhanced piezo- and ferroelectricity. The process may work on a large range of materials to potentially produce a variety of nano- and micro- structures with enhanced properties.