Semiconductor Capacitor With Stacked Electrodes And Etch Stops

The capacitor structure is divided into multiple functional layers including first and second dielectric layers, etch stop layers, and metal electrode layers. Each layer serves a specific function: dielectric layers for charge storage, etch stop layers for process control, and metal layers for electrical connections. This segmentation enables precise control over capacitor formation while maintaining manufacturability through specialized processing for each layer type.

The patent transitions from planar capacitor structures to three-dimensional vertically-stacked capacitor structures. Multiple dielectric and electrode layers are stacked vertically to increase storage capacity without increasing planar footprint. This dimensional change allows precise capacitor formation in the vertical dimension while maintaining compatibility with standard semiconductor manufacturing processes.

Etch stop layers are formed preliminarily between dielectric layers during the deposition sequence. These etch stop layers are prepared in advance to facilitate subsequent etching processes and enable precise positioning of metal electrode layers. This preliminary action simplifies the overall manufacturing process by providing built-in process control features that guide subsequent fabrication steps.

Etch stop layers serve as intermediary layers between dielectric layers and metal electrode layers. These intermediary layers facilitate the etching process by providing selective etch targets, enabling precise formation of electrode structures without damaging adjacent dielectric layers. The intermediary etch stop layers simplify manufacturing by decoupling the deposition and etching processes.

Multiple dielectric layers and metal electrode layers are nested vertically to form a stacked capacitor structure. Each dielectric layer is nested between metal electrode layers, creating a compact multi-layer configuration. This nesting approach increases charge storage capacity by multiplying the effective capacitor area without increasing the planar footprint, while the regular repeating pattern maintains manufacturing simplicity.

The capacitor structure uses composite material stacks combining different dielectric materials with different electrical properties. High-k dielectric materials are combined with standard dielectric materials to enhance charge storage capacity. The composite material approach increases storage capability through material selection rather than increasing structural complexity.