Characterization of ZrO2 thin films deposited by MOCVD for high-density 3D capacitors
This work deals with high-density integrated capacitors for output filters in future micro DCDC converters. To reach high capacitance density, 3D structures were created in silicon with DRIE followed by MOCVD of ZrO2 (100nm thick). The step coverage revealed two deposition regimes: a surface reaction controlled regime for cavities aspect ratio lower than 2 and a diffusion-controlled regime for higher aspect ratios. The ZrO2 films present mostly a cubic/tetragonal structure. The permittivity extracted from the measurement is 26.4. These results are discussed with static dielectric responses calculated in literature.
zro2 thin film mocvd 3d structures step coverage high-k mis capacitor