Plating Apparatus Conduit Potential Sensor Film Uniformity
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Solution Overview
Problem
Variations in film thickness of plating films on substrates due to dimensional tolerances and changes in plating solution state lead to non-uniform plating results, especially when multiple substrates are processed under the same conditions.
Innovation Solution
A plating apparatus with a conduit system that includes a potential sensor to measure the plating solution's potential, allowing for real-time adjustments of plating conditions such as current and time, and optionally featuring an auxiliary anode to enhance film uniformity, ensures consistent film thickness across substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same process recipe is used for multiple substrates in the same carrier, then processing efficiency is improved, but film thickness uniformity deteriorates due to substrate dimensional tolerances and plating solution state changes
Solution Approach 1:
The patent introduces dynamic adjustment of plating conditions during the plating process. The plating current is adjusted in real-time based on measured values from potential sensors and film thickness relationships, allowing the system to adapt to substrate variations and maintain uniform film thickness even when processing multiple substrates with different dimensional tolerances under the same process recipe.
Solution Approach 2:
The patent implements a feedback mechanism where potential sensors measure the plating solution potential during the plating process, and these measurements are used to calculate film thickness in real-time. The system then uses this information to adjust plating current dynamically, creating a closed-loop control system that maintains film thickness uniformity across multiple substrates processed simultaneously.
2Manufacturing precision
If plating conditions are adjusted to compensate for substrate variations, then film thickness uniformity is improved, but process complexity increases
Solution Approach 1:
The patent introduces potential sensors as intermediary devices that indirectly measure film thickness by detecting plating solution potential. Instead of directly measuring each substrate's film thickness, the system uses the potential sensor as a mediator to infer film thickness through calculated relationships, simplifying the measurement process while maintaining precision.
Solution Approach 2:
The patent changes the measurement parameter from direct film thickness measurement to plating solution potential measurement. By measuring potential instead of directly measuring film thickness, the system simplifies the measurement process and enables real-time monitoring without complex measurement equipment, while still achieving precise control over film thickness uniformity.
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 apparatus achieves improved uniformity of the plating film by dynamically adjusting plating conditions based on real-time measurements, reducing variations and enhancing the consistency of film thickness across substrates.
Implementation Method 1
a potential sensor that is disposed outside the region of the conduit and that is configured to measure a potential of the plating solution
Implementation Method 2
an auxiliary anode disposed in the second portion of the conduit
Implementation Method 3
a voltage is applied between the substrate and an anode, thereby precipitating a conductive film on a substrate surface
Data Source
AI summary
Provided is a plating apparatus capable of improving uniformity of a plating film formed on a substrate. The plating apparatus includes a plating tank, a substrate holder that holds a substrate, and an anode disposed in the plating tank to oppose the substrate held by the substrate holder. The plating apparatus also includes a conduit having a first portion including an opening end disposed in a region between the substrate held by the substrate holder and the anode, and a second portion apart from the region between the substrate held by the substrate holder and the anode, the conduit having at least a part filled with a plating solution, and a potential sensor that is disposed in the second portion of the conduit and that is configured to measure a potential of the plating solution.