Principal Investigator: Professor John Wang, MSE

New-generation communication applications such as intelligent systems, smart phones, Internet of things (IOT), and tactical communication etc., require wireless systems with high bandwidth, low latency, extra-high data rates, and much raised connectivity enabled by new infrastructure of 6G and beyond. The high-performance components and devices such as filters and resonators requires advanced materials with robust and thermally-stable dielectric properties with high tunability, low loss and other critically required properties. Ferroelectric oxides/non-oxides, such as (Ba,Sr)TiO3 (BST), (Pb,Sr)TiO3 (PST) and certain doped metal nitrides, are known to show highly tunable dielectric properties and have been extensively studied in the past. However, the relatively large loss hinders their utilization for high-frequency applications. Despite many efforts in the past two/three decades, the quest for suitable and stable materials with robust dielectric properties, ultralow dielectric loss, and large tunability is still on-going. Unfortunately, none of the known conventional materials possess the requisite whole set of physical properties. In this project, we are conducting a wide-scale search of the engineered functional materials first, before narrowing down the most promising candidates, and then concentrating on their fabrication of the designed structures and evaluation of functional performance for targeted applications

Alkali deficient KNN-based ferroelectric thin films studied down to atomic scales