Hybrid-Bonded Memory Chip Stack for Efficient TSV Power Transfer
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Solution Overview
Problem
Existing technologies face challenges in efficiently integrating memory chips, such as DRAM chip stacks, with process chips, particularly in establishing direct electrical connections through TSVs and I/O structures for effective power transfer.
Innovation Solution
A semiconductor device is developed with a hybrid bonding interface that includes dielectric-to-dielectric and metal-to-metal bonding between a memory chip stack and a process chip, enabling efficient power transfer through electrically connected TSVs and I/O structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional two-dimensional integration processes are used, then manufacturing simplicity is maintained, but power distribution efficiency and performance are insufficient
Solution Approach 1:
The patent transitions from conventional two-dimensional chip integration to three-dimensional stacking architecture. Memory chips are stacked vertically above the process chip, with TSVs extending through multiple layers to establish electrical connections. This dimensional change enables improved power distribution efficiency by reducing current path lengths and increasing connectivity density, while the standardized 3D stacking process mitigates the complexity increase through systematic manufacturing approaches.
2Reliability
If direct electrical connections through TSVs are established, then power transfer efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements preliminary alignment features during the TSV formation process. Alignment marks are defined in the etch stop layer and interlayer dielectric layers before TSV etching, enabling precise registration of TSVs across multiple chip layers. This preliminary action ensures reliable electrical connections while managing manufacturing precision requirements through built-in guidance structures rather than relying solely on post-formation alignment.
Solution Approach 2:
The etch stop layer serves as an intermediary structure that facilitates precise TSV formation and alignment. This dedicated layer provides mechanical support, defines etch boundaries, and incorporates alignment features that guide subsequent processing steps. By introducing this intermediary element, the system achieves reliable electrical connections through TSVs while reducing the direct precision burden on adjacent layers.
3Area of stationary object
If multiple memory chips are stacked vertically, then footprint is reduced, but bonding interface complexity increases
Solution Approach 1:
The bonding interface is segmented into distinct functional regions: dielectric-to-dielectric bonding areas for mechanical support and insulation, and metal-to-metal bonding areas for electrical connectivity. This segmentation allows each bonding region to be optimized independently, simplifying the overall bonding process despite the multi-layer stacking complexity. The process chip and memory chips are bonded in a systematic sequence that manages interface complexity while achieving compact vertical integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hybrid bonding technique facilitates efficient power distribution and electrical connectivity between memory and process chips, enhancing performance and reducing the footprint of integrated circuits.
Implementation Method 1
a hybrid bonding interface including dielectric-to-dielectric bonding and metal-to-metal bonding is present between the memory chip stack and the process chip
Data Source
AI summary
A semiconductor device is provided in which a memory chip stack is stacked vertically on, and hybrid bonded to, a process chip. In the semiconductor device, a hybrid bonding interface including dielectric-to-dielectric bonding and metal-to-metal bonding is present between the memory chip stack and the process chip.