PVD HfO2 for high-precision MIM capacitor applications

Abstract

Metal-insulator-metal (MIM) capacitors are fabricated using sputtered HfO2 with Ta and TaN for top and bottom electrodes, respectively. High-capacitance densities from 4.7 to 8.1 fF/μm2 have been achieved while maintaining the leakage current densities around 1 × 10-8 A/cm2 within the normal circuit bias conditions. A guideline for the insulator thickness and its dielectric constant has been obtained by analyzing the tradeoff between the linearity coefficient and the capacitance density.