Electrostatic Substrate Support for Wafer Warpage Compensation
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Solution Overview
Problem
Substrate warpage during semiconductor manufacturing processes due to variations in film stress and high processing temperatures affects the quality and yield of semiconductor devices and device packages.
Innovation Solution
A method and apparatus using a substrate support with embedded electrodes that apply DC and AC biases to detect and compensate for substrate warpage by adjusting electrostatic forces, reducing non-uniform separation through differential DC biases based on capacitance and current differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high processing temperatures are applied during manufacturing processes, then processing speed and productivity are improved, but substrate warpage increases due to thermal stresses
Solution Approach 1:
The patent applies different DC bias voltages to different electrode regions to dynamically adjust electrostatic forces and compensate for thermally-induced substrate warpage, maintaining substrate flatness during high-temperature processing
Solution Approach 2:
The substrate support is divided into multiple electrode regions that can be independently controlled with different DC bias levels, allowing localized compensation for warpage in different areas of the substrate based on specific thermal stress patterns
2Adaptability or versatility
If film stress variations occur during deposition processes, then manufacturing flexibility is improved, but substrate warpage increases affecting device quality
Solution Approach 1:
The system detects differences in AC current between electrode regions and uses this feedback to adjust DC bias voltages, creating a closed-loop control mechanism that compensates for warpage caused by film stress variations
Solution Approach 2:
The patent dynamically adjusts DC bias voltage parameters based on detected AC current differences to compensate for warpage induced by varying film stresses during different manufacturing processes
3Manufacturing precision
If multiple DC bias voltages are applied to different electrode regions, then substrate flatness is improved, but device complexity increases
Solution Approach 1:
The substrate support is segmented into multiple independently controllable electrode regions, each capable of receiving different DC bias voltages to address warpage in specific areas without affecting other regions
Solution Approach 2:
Different DC bias voltages are applied to different electrode regions based on local warpage conditions, allowing targeted compensation without requiring complex global control mechanisms
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
Improves substrate flatness and processing quality, reliability, and yield by effectively compensating for warpage, ensuring uniform substrate support during manufacturing.
Implementation Method 1
A difference is detected in a first capacitance formed between the first pair of electrodes and the substrate and a second capacitance formed between the second pair of electrodes and the substrate
Implementation Method 2
chucking a substrate to a surface of a substrate support by applying a first DC bias to a first pair of electrodes and a second pair of electrodes
Implementation Method 3
A second DC bias is applied to the first pair of electrodes and a third DC bias is applied to the second pair of electrodes. The second DC bias is different from the third DC bias, and the second DC bias and the third DC bias are selected based on detecting the difference in the first capacitance and the second capacitance
Data Source
AI summary
Embodiments of the disclosure include apparatus and methods for substrate processing. A method includes applying a first DC bias to a first pair of electrodes and a second pair of electrodes, the first pair is disposed within a first portion of a substrate support and the second pair is disposed within a second portion of the substrate support. The method further includes detecting a difference in a first electrical characteristic of a first flow and a second electrical characteristic of a second flow between the electrode pairs and the substrate. A second DC bias is applied to the first pair and a third DC bias, different from the second DC bias, is applied to the second pair. The second DC bias and the third DC bias are selected based on the difference in the first and second flows.