Piezoelectricity and Ferroelectricity in hBN скачать в хорошем качестве

Piezoelectricity and Ferroelectricity in hBN

Two-dimensional (2D) hexagonal boron nitride (hBN) has become integral to the fabrication of heterostructures based on van der Waals 2D crystals. It is a wide-bandgap insulator with a unique combination of properties, including exceptional strength, large oxidation resistance at high temperatures, and optical functionalities. Like many Group III-nitride materials, its covalent bonds are highly polar; presenting the possibility of spontaneous and piezoelectric polarisations in the correct crystalline configurations. In this work, we outline the observation of in-plane piezoelectricity for monolayer (one atom thick) hBN [1] – a property which does not exist for the bilayer or bulk systems. Furthermore, we report on the emergence of spontaneous polarisation and ferroelectricity in anomalously stacked hBN interfaces [2]. Throughout this work we utilise complimentary atomic force microscopy and Kelvin Probe force microscopy imaging to quantify the effects. As well as detailed modelling for in-plane strain profiles and interface relaxation. Both in-plane piezoelectricity and out-of-plane ferroelectricity present exciting possibilities for precise control over device properties. View full abstract and speaker details at: t.ly/SAzg. Click here to view all CA2DM events and webinars at t.ly/Wqb0.