Semiconductor Capacitor Structure With Stacked Dielectric Layers

The patent transitions from planar capacitor design to three-dimensional stacked capacitor design. Multiple capacitor units are stacked vertically along the thickness direction of the substrate, utilizing the third dimension (height) to increase capacitance without expanding the lateral layout area. The stacked configuration includes multiple conductive plates and dielectric layers arranged in alternating layers, effectively multiplying the capacitance within the same footprint.

The patent implements nested capacitor structures where conductive plates and dielectric layers are arranged in alternating stacked layers. Each capacitor unit is nested within the same lateral footprint, with multiple capacitor units sharing the same spatial envelope by stacking them vertically. This nesting approach allows multiple capacitive elements to occupy the same planar area, significantly increasing the effective capacitance density.

The patent optimizes the dielectric layer thickness parameter to balance capacitance enhancement with manufacturing feasibility. By carefully selecting and controlling the dielectric layer thickness within specific ranges, the design achieves high capacitance values while maintaining manufacturability. The stacked configuration allows the use of moderate thickness values multiplied across multiple layers, avoiding the need for extremely thin single layers that would be difficult to manufacture.

The patent divides the total dielectric thickness into multiple discrete dielectric layers stacked in sequence. Instead of requiring a single extremely thin dielectric layer, the design segments the capacitance function across multiple layers with moderate individual thicknesses. This segmentation approach relaxes manufacturing precision requirements for each individual layer while achieving the cumulative capacitance effect needed.