Staircase Flip-Chip Interconnects for Higher 3D Memory I/O Density

The patent transitions from planar (2D) interconnect structures to three-dimensional (3D) staircase interconnect structures. Multiple staircase layers are stacked vertically, each layer providing additional I/O connection points. The staircase layers are offset from each other, creating a stepped configuration that increases the number of accessible connection points without increasing the planar footprint, thus resolving the contradiction between increasing I/O connections and maintaining device complexity.

The patent employs vertical stacking of multiple staircase layers to create additional I/O connection points in the third dimension. This approach allows the creation of sufficient I/O contacts even when feature sizes are reduced, as the vertical dimension provides additional space for contacts without requiring further reduction in lateral feature dimensions. The staircase structure with offset layers creates multiple accessible contact points that can be formed using standard semiconductor fabrication processes.

The patent introduces staircase interconnect structures with offset layers as an intermediary between the IC chips and the external environment, eliminating the need for wire bonding. The staircase layers provide direct electrical pathways through the substrate, serving as a mediator that replaces the traditional wire bonding process. This intermediary structure decreases parasitic capacitance and inductance while maintaining manufacturability through standard semiconductor fabrication techniques such as deposition, etching, and planarization.