Negative Capacitance in BaTiO3/BiFeO3 Bilayer Capacitors

摘要: Negative capacitances provide an approach to reduce heat generations in field-effect transistors during the switch processes, which contributes further miniaturization of conventional integrated circuits. Although there are many studies about negative using ferroelectric materials, direct observation stable has rarely been reported. Here, we put forward a dc bias assistant model bilayer capacitors, where one layer with large dielectric constant and other small needed. can be obtained when external electric fields larger than critical value. Based on model, BaTiO3/BiFeO3 capacitors chosen as study objects, observed directly. Additionally, upward self-polarization effect reduces field, may method for realizing zero and/or ...