Semiconductor Die Package Interconnects With Low-Resistance Barrier Blocking
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Solution Overview
Problem
The diffusion of electrically conductive metals in elongated conductive structures and metallization layers within semiconductor die packages leads to increased electrical resistance and current leakage, which is exacerbated by the use of barrier layers that have higher resistivity.
Innovation Solution
Incorporating blocking materials to inhibit the growth of barrier layers, allowing for direct metal-to-metal connections between elongated conductive structures and metallization layers, thereby reducing contact resistance and preventing diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If barrier layers are used to prevent metal diffusion, then diffusion prevention is improved, but electrical resistance increases due to higher resistivity of barrier layers
Solution Approach 1:
The patent removes the barrier layer from the interface between the elongated conductive structure and the metallization layer, extracting the harmful high-resistivity element while preserving its diffusion prevention function through alternative means (in-situ formed barrier at the conductive structure surface)
Solution Approach 2:
The patent introduces an intermediary in-situ formed barrier layer that is created directly on the surface of the elongated conductive structure through the deposition process itself, serving as a thin protective interface that allows direct metal-to-metal contact while preventing diffusion
2Loss of energy
If direct metal-to-metal connections are made to reduce contact resistance, then electrical resistance decreases, but metal diffusion increases
Solution Approach 1:
The patent performs preliminary action by forming the barrier layer on the conductive structure surface before the metallization layer is deposited, so the barrier is already in place to prevent diffusion when the metal makes direct contact
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 achieves low power consumption and increased signal propagation speeds in semiconductor die packages by minimizing electrical resistance and preventing metal diffusion.
Implementation Method 1
a blocking layer is formed on a surface of the elongated conductive structure... the blocking layer inhibiting growth of the barrier layer
Data Source
AI summary
An elongated conductive structure is included through a device layer of a semiconductor die included in a semiconductor die package. The elongated conductive structure connects to metallization layers in interconnect layers on opposing sides of the device layer. A blocking material is used to inhibit growth of barrier layers on the elongated conductive structure during formation of the barrier layers for the metallization layers. This enables the metallization layers to land directly on the elongated conductive structure as opposed to the barrier layers being between the elongated conductive structure and the metallization layers. In this way, metal-to-metal connections may be achieved between the conductive structure and the metallization layers, which enables a low contact resistance to be achieved between the conductive structure and the metallization layers while enabling barrier layers to be formed to provide diffusion protection for the metallization layers.