CAPACITIVE DEVICES USING NEGATIVE CAPACITANCE OF FERROELECTRIC MATERIALS

摘要

A capacitance device according to an embodiment includes a substrate; a first dielectric layer placed on the substrate and having positive capacitance; a second dielectric layer placed on the top of the first dielectric layer or between the substrate; and the first dielectric layer having negative capacitance in order to make the whole capacitor of the capacitor device larger than the capacitance of each dielectric layer. The negative capacitance indicates a ferroelectric layer and a composite mixed with a ferroelectric material in order to stabilize the negative capacitance of the ferroelectric layer in an operation temperature area.