| Abstract Scope |
Dielectric, piezoelectric and ferroelectric thin films and nanostructures have been intensively studied for emerging functional devices. In such low-dimensional nano-scale systems, the properties are often remarkably influenced by the mechanical and electrostatic boundary conditions. In this presentation, we introduce our bottom-up growth approaches to manipulating them. For instance, 2-step growth method using a low-temperature buffer layer was employed to modify strain in (Ba,Sr)TiO3 films, which enabled to control the dielectric tunability using a substrate of the same kind. Self-assembled growth of BaTiO3-CeO2 oriented composite films resulted in the significantly enhanced dielectric nonlinearity. Self-assembled growth of epitaxial Pb(Zr,Ti)O3 nanorods resulted in the pure c-domain structure due to their asymmetric electrostatic boundary condition. Because the nanorods are almost mechanically free from the substrate, they achieved the piezoelectric response as large as that for a single-domain crystal. |