TSV Connection Terminal Metal Capping Layer Oxidation Protection
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Solution Overview
Problem
There is a need for reliable and stable through-silicon-via (TSV) connection structures in three-dimensional (3D) integrated circuit devices to ensure effective electrical connections, as existing technologies face challenges in maintaining consistency and reliability due to factors like oxidation and degradation during bonding processes.
Innovation Solution
The integration of a metal capping layer with a flat capping portion and wedge-shaped capping portions on the connection terminal, formed using a pulse-type current electroplating process, which covers the side walls of the TSV structure, providing a stable and reliable electrical connection by reducing oxidation and degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional metal layer is formed on the connection terminal, then oxidation and degradation occur during bonding processes, but forming no metal layer results in poor electrical connection and bonding reliability
Solution Approach 1:
The metal capping layer is applied selectively to specific regions of the connection terminal rather than uniformly across the entire surface. The layer covers the side wall and bottom surface of the connection terminal while leaving the top surface exposed, providing oxidation protection where needed while maintaining electrical conductivity at the bonding interface.
Solution Approach 2:
The metal capping layer is formed in advance before the bonding process occurs. This preliminary protective layer prevents oxidation and degradation from occurring during subsequent bonding operations, ensuring the connection terminal remains in optimal condition for reliable bonding.
2Object-affected harmful factors
If a thick metal capping layer is formed to provide adequate coverage, then oxidation protection is improved, but manufacturing complexity and material usage increase
Solution Approach 1:
The metal capping layer thickness and coverage are optimized for specific regions. The side wall and bottom surface receive adequate metal coverage for oxidation protection, while the top surface remains exposed. This localized approach provides necessary protection without the complexity and material waste of a complete uniform coating.
Solution Approach 2:
The metal capping layer provides partial coverage rather than complete coverage of the connection terminal. This partial action is sufficient to protect the critical areas (side wall and bottom) from oxidation while avoiding the excessive material usage and manufacturing complexity that would result from complete coverage.
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 solution enhances the reliability and stability of TSV connections by minimizing oxidation and degradation, improving the bonding process and overall performance of the integrated circuit devices.
Implementation Method 1
forming a metal capping layer on the connection terminal by performing an electroplating process while applying a pulse-type current using the conductive layer as an electrode
Data Source
AI summary
An integrated circuit device includes a semiconductor structure, a through-silicon-via (TSV) structure that penetrates through the semiconductor structure and a connection terminal connected to the TSV structure. A metal capping layer includes a flat capping portion that covers the bottom surface of the connection terminal and a wedge-shaped capping portion that is integrally connected to the flat capping portion and that partially covers a side wall of the connection terminal. The metal capping layer may be formed by an electroplating process in which the connection terminal is in contact with a metal strike electroplating solution while a pulse-type current is applied.