Semiconductor Interconnect Pattern Layout for Stable Process Margins

The patent applies segmentation by dividing the interconnection structure into multiple layers (first ILD with first patterns, second ILD with second patterns). This layering allows each layer to be optimized independently for its specific function, enabling higher overall integration while maintaining manufacturing precision through controlled pitch variations within each segment.

The patent transitions from two-dimensional planar interconnections to three-dimensional stacked interconnections by adding vertical layers (first ILD and second ILD). This dimensional change increases the degree of integration by utilizing vertical space, while the alternating concave-convex pattern design maintains manufacturability by optimizing the projection footprint and reducing pitch variations in the planar direction.

The patent segments the high-density interconnection structure into multiple manageable layers with alternating patterns. Each layer has optimized pitch and spacing that can be manufactured with current process capabilities, while the cumulative effect across layers achieves the desired high interconnection density without sacrificing process margin in any single layer.

The patent applies local quality by creating alternating concave and convex patterns in different layers. This allows different regions of the interconnection structure to have locally optimized characteristics - some regions with higher density for performance-critical paths, and other regions with relaxed pitch for manufacturing robustness, thereby maintaining overall process margin while achieving high average density.

The patent employs asymmetry by creating alternating concave and convex patterns rather than using uniform symmetric shapes. This asymmetric design actually simplifies the manufacturing process by reducing pitch variations through the interlocking nature of the patterns, while the alternation provides a systematic regularity that prevents excessive complexity from arising.

The patent applies inversion by alternating between concave and convex patterns in adjacent layers. Instead of making all patterns the same shape, the inversion approach creates complementary shapes that fit together, which simplifies the overall pitch control and manufacturing precision while the systematic alternation keeps the device structure manageable and not overly complex.