BEOL MIM Capacitor Layout for Corner Discharge Suppression

The patent segments the conductor plate layers into multiple distinct layers (first, second, third, fourth conductor plate layers) with different dimensions, where each layer can be independently sized to meet specific circuit requirements. This segmentation allows the capacitor to provide varied capacitance values and electrical characteristics while maintaining reliability through the enclosed structure.

The patent implements a nested configuration where conductor plate layers are enclosed by insulator layers, and smaller conductor plate layers are positioned within the footprint of larger ones. Specifically, the second conductor plate layer is enclosed by the first insulator layer, and the fourth conductor plate layer is enclosed by the third insulator layer, creating a nested structure that distributes electric fields evenly and prevents localized intensification.

The nested configuration where insulator layers completely enclose conductor plate layers eliminates exposed edges and step shapes that cause electrostatic stress concentration. The first insulator layer encloses the second conductor plate layer, and the third insulator layer encloses the fourth conductor plate layer, creating a sealed structure that prevents leakage paths and distributes electric fields uniformly throughout the capacitor.

The patent incorporates additional insulator layers (first and third insulator layers) that serve as protective barriers before electrostatic stress can cause breakdown. These insulator layers are deposited beforehand to completely surround the conductor plate layers, providing a cushioning effect that prevents direct stress concentration at edges and interfaces, thereby preventing leakage and TDDB failures.

The patent divides the capacitor into segmented layers with specific enclosure relationships: the first insulator layer encloses the second conductor plate layer, and the third insulator layer encloses the fourth conductor plate layer. This segmentation creates a modular structure that achieves even electric field distribution through systematic layering, making the complexity manageable and repeatable across different capacitor designs.

The patent resolves structural complexity by transitioning from a planar two-dimensional arrangement to a three-dimensional stacked configuration. By stacking conductor plate layers and insulator layers in multiple dimensions with vertical enclosure relationships, the patent achieves even electric field distribution in all spatial directions, transforming a potentially complex lateral arrangement into a more manageable vertical stack.