3D Stacked Memory Cavities Heat Dissipation
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Solution Overview
Problem
Current memory device manufacturing techniques face challenges in achieving economic production and increasing device density, with issues such as electrical shorts, thermal cycling-induced failures, and inefficient heat dissipation in high-density memory modules.
Innovation Solution
The approach involves flipping IC chips onto substrates, integrating components into stacked substrates using cavities, direct mounting of IC dies, and employing through-silicon vias and heat conductive materials to enhance heat dissipation, while thinning IC packages and using underfill methods to prevent electrical failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If IC chips are stacked in high-density memory modules, then device density is improved, but heat dissipation becomes inefficient
Solution Approach 1:
The patent transitions from planar 2D memory module layouts to 3D stacked architectures, arranging IC chips vertically in multiple layers. This dimensional change allows significantly higher device density within the same footprint while introducing new thermal management challenges that require heat dissipation structures on multiple surfaces (top, bottom, and side walls) of the stacked assembly.
2Ease of manufacture
If IC chips are mounted using conventional methods, then manufacturing is simple, but electrical shorts and thermal cycling failures occur
Solution Approach 1:
The patent introduces an underfill material as an intermediary substance between the IC chip and substrate. This underfill serves multiple functions: it provides mechanical support and stress relief to prevent thermal cycling failures, fills gaps to eliminate air pockets that could cause electrical shorts, and creates a stable adhesive bond. The application method using dispensing nozzles maintains manufacturing simplicity while dramatically improving reliability.
3Quantity of substance
If IC packages are thinned to increase density, then device density is improved, but structural integrity may be compromised
Solution Approach 1:
The patent applies underfill material in advance during the assembly process, before the thinned IC packages are fully subjected to thermal cycling and mechanical stress. This preliminary structural support compensates for the reduced package thickness, preventing damage during subsequent manufacturing and operation. The underfill is dispensed to create a cushioning layer that reinforces the thinned packages without requiring changes to the IC thinning process itself.
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 method achieves higher IC density, reduces the risk of electrical shorts and thermal cycling failures, and improves heat dissipation in memory modules, leading to more efficient and compact memory device manufacturing.
Implementation Method 1
one or more external layers of heat conductive material along at least three edges of the substrate. The external layer of heat conductive material is coupled to the ground planes to transfer heat from the ground planes
Implementation Method 2
The approach involves flipping IC chips onto substrates, integrating components into stacked substrates using cavities, direct mounting of IC dies, and employing through-silicon vias and heat conductive materials to enhance heat dissipation, while thinning IC packages and using underfill methods to prevent electrical failures.
Data Source
AI summary
A memory device with die stacking is provided. A plurality of substrates layers are stacked together into a stack. Each substrate layer may include a substrate having a plurality of cavities to receive integrated circuit components within the thickness of the substrate. A plurality of conductive spheres are arranged between at least two adjacent substrate layers and are electrically coupled to the integrated circuit components in at least one of the two adjacent substrates. The two adjacent substrate layers of the stack include: (a) a first substrate having a first plurality of cavities to receive integrated circuit components, and (b) a second substrate having a second plurality of cavities to receive integrated circuit components, wherein the first plurality of cavities is offset from a second plurality of cavities.