3D Memory Stack Bonding for Shorter Interconnects and Thermal Isolation
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Solution Overview
Problem
The performance and functionality of Integrated Circuits (ICs) are hindered by degrading wire performance due to 'scaling', which dominates power consumption and functionality, necessitating innovative 3D stacking techniques to reduce wire lengths and improve transistor placement.
Innovation Solution
The method involves constructing 3D IC systems through layer transfer technologies, including oxide-to-oxide and conductor-to-conductor bonding, with thermal isolation layers to manage temperature differences between memory and logic strata, enabling efficient integration of memory and logic circuits while reducing thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scaling is applied to reduce component sizes, then transistor performance and density improve, but wire performance degrades and power consumption increases
Solution Approach 1:
The patent transitions from 2D planar IC layout to 3D stacked architecture, stacking multiple IC layers vertically to reduce wire lengths while maintaining high transistor density. This dimensional change allows transistors to be placed closer in the vertical dimension, significantly reducing interconnect lengths and associated power consumption.
2Speed
If 3D stacking is implemented to reduce wire lengths, then wiring delay decreases, but thermal management becomes more challenging
Solution Approach 1:
The patent introduces intermediary thermal management structures between stacked IC layers, including thermal vias, heat spreaders, and thermally conductive materials that facilitate heat dissipation from upper layers to lower layers and substrate, effectively managing temperature while maintaining 3D stacking benefits.
3Productivity
If multiple memory wafers are stacked with oxide-to-oxide and conductor-to-conductor bonding, then integration efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent prepares bonding surfaces with oxide layers and conductor patterns in advance on separate memory wafers before stacking. This preliminary preparation of bonding interfaces enables efficient oxide-to-oxide and conductor-to-conductor bonding during the stacking process, improving integration efficiency while managing manufacturing complexity through pre-planned bonding schemes.
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
This approach enhances IC performance by reducing wire lengths, managing thermal issues, and improving power efficiency through efficient integration and thermal isolation, thereby overcoming the limitations of scaling in traditional 2D ICs.
Implementation Method 1
thermal isolation layers to manage temperature differences between memory and logic strata, enabling efficient integration of memory and logic circuits while reducing thermal conductivity
Implementation Method 2
the bonding includes oxide to oxide and conductor to conductor bonding
Implementation Method 3
the bonding includes oxide to oxide and conductor to conductor bonding
Data Source
AI summary
A semiconductor device including: a first level including first memory arrays, a plurality of first transistors, and a plurality of first metal layers; a second level disposed on top of the first level, where the second level includes second memory arrays; a third level disposed on top of the second level, where the third level includes a plurality of third transistors and a plurality of third metal layers, where the third level is bonded to the second level, where the bonded includes oxide to oxide bonding regions and a plurality of metal to metal bonding regions, where the first level includes first filled holes, where the second level includes second filled holes, where the second filled holes are aligned to the first filled holes with a more than 1 nm but less than 40 nm alignment error, and where the third level includes decoder circuits.