Layer-by-layer engineering of two-dimensional perovskite nanosheets for tailored microwave dielectrics

We report an approach for constructing ultrathin microwave dielectrics using two-dimensional (2D) perovskite nanosheets (Ca2Nb3O10). The solution-based layer-by-layer assembly of Ca2Nb3O10 nanosheets enables the tailoring of dielectric responses and breakdown voltage in order to realize miniaturized capacitors with improved performances. Multilayer stacked nanosheet films showed a stable dielectric response of up to 10 GHz; the dielectric constant of similar to 200 is the highest among high-k perovskites in the ultrathin region (< 30 nm). Moreover, the nanosheet films realized a high capacitance density (similar to 20 mu F/cm(2)) with a robust thermal stability up to 250 degrees C. These superior dielectric properties of perovskite nanosheets offer a new solution for high-performance microwave devices. (C) 2017 The Japan Society of Applied Physics