Multi-chambered Electroplating Shield for Uniform Metal Deposition
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Solution Overview
Problem
Conventional electrochemical deposition (ECD) processes for semiconductor devices result in non-uniform metal layer thickness, leading to defective devices and reduced production yields due to varying current densities across the substrate.
Innovation Solution
A multi-chambered ECD system with a shield between the cathode and anode chambers, configured to control electric current flow and fluid communication, ensuring uniform metal deposition by adjusting the shield's position and the pattern of predefined openings to optimize the electric field and fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-chambered ECD system is used, then the device structure is simple, but the metal layer thickness uniformity deteriorates
Solution Approach 1:
The ECD system is divided into multiple chambers (at least a first chamber and a second chamber) separated by a shield. The cathode is placed in the first chamber and the anode in the second chamber, with the shield containing predefined openings positioned between them. This segmentation allows independent control of electric field distribution in each chamber, enabling uniform metal layer deposition while maintaining manageable system complexity through modular design.
2Ease of manufacture
If conventional ECD process is used, then the process is simple, but the current density uniformity deteriorates
Solution Approach 1:
A shield with predefined openings is introduced as an intermediary component between the cathode and anode chambers. This shield mediates the electric field distribution by selectively blocking and directing current flow through its openings, ensuring uniform current density across the substrate surface while maintaining the electrochemical deposition process.
3Ease of manufacture
If shield position is not optimized, then the system is easier to manufacture, but the electric field distribution deteriorates
Solution Approach 1:
The shield is designed with adjustable positioning capabilities, allowing its position to be dynamically optimized during system setup or operation. This enables fine-tuning of the electric field distribution and current density uniformity without requiring complex fixed structures, balancing manufacturing ease with precise field control through adaptable configuration.
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 system achieves significantly improved uniformity in metal layer thickness across the semiconductor substrate, reducing defects and enhancing production yields by minimizing peripheral electric current flow and optimizing the electric field distribution.
Implementation Method 1
The shield is configured to deter electric current flow between the first chamber and the second chamber, other than though predefined openings in the shield
Implementation Method 2
The ECD process typically involves placing a semiconductor substrate having a plurality of ICs on its surface into a single-chambered ECD system and applying a voltage between an anode and cathode of the system
Data Source
AI summary
A multi-chambered system for electroplating metal layers on a semiconductor substrate. The system comprises a fluid reservoir having at least a first chamber and a second chamber. A cathode is located in the first chamber, an anode is located in the second chamber, and a shield is located between the cathode and anode. The cathode is configured to be electrically coupled to a semiconductor substrate locatable in the first chamber. The anode is configured to oppose a first major surface of the semiconductor substrate. The shield is configured to deter electrolytic fluid communication between the first and second chamber, other than through predefined openings in the shield.