Flexible Superstrate Modulation for Semiconductor Planarization
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Solution Overview
Problem
Existing planarization techniques in semiconductor fabrication face defects such as non-fill defects due to the interaction between the superstrate and dispense material on the substrate, particularly during whole wafer processing.
Innovation Solution
An apparatus and method involving a substrate holder and a superstrate holder with a gas supply system that modulates the shape of the superstrate to create distinct gaps, directing gas flow and reducing resistance between the substrate and superstrate, thereby controlling the atmosphere and preventing gas trapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the superstrate makes contact with the dispense material on the substrate, then planarization is achieved, but non-fill defects arise
Solution Approach 1:
The gas supply system introduces gas into the space between the superstrate and substrate before the superstrate contacts the dispense material. This preliminary gas introduction prevents gas trapping and non-fill defects by ensuring the space is properly filled and controlled before the critical contact moment, thereby improving both planarization quality and reducing defects
Solution Approach 2:
The system creates a controlled atmosphere in the gap between the superstrate and substrate by introducing gas (such as nitrogen or other inert gases). This inert environment prevents unwanted chemical reactions and gas trapping that would cause non-fill defects, while maintaining the necessary conditions for successful planarization when the superstrate contacts the material
2Reliability
If gas is introduced between the superstrate and substrate, then non-fill defects are reduced, but the system complexity increases
Solution Approach 1:
The gas supply system acts as an intermediary mechanism that introduces controlled gas flow between the superstrate and substrate. By using gas as a mediator to fill the gap and prevent gas trapping, the system achieves reliable planarization without requiring complex mechanical adjustment mechanisms, thus managing system complexity while improving reliability
Solution Approach 2:
The invention employs pneumatic principles by using gas flow to control the environment between the superstrate and substrate. The gas supply system utilizes pressure differential and gas flow dynamics to achieve proper filling and prevent defects, which is simpler and more reliable than complex mechanical control systems
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 effectively mitigates non-fill defects by ensuring uniform gas distribution and filling, enhancing the planarization process and reducing defects in semiconductor wafer fabrication.
Implementation Method 1
flowing a gas into a region between the first gap and the second gap. The gas may flow between the surface of the substrate and the superstrate
Data Source
AI summary
An apparatus may include a substrate holder configured to hold a substrate. The substrate holder may include a first chucking region having a first area and an adjacent region extending from the chucking region. The apparatus may also include a superstrate holder configured to hold a superstrate. The superstrate holder may include a second chucking region having a second area. The second area may be larger than the first area and the superstrate holder faces the substrate holder forming a first gap between the adjacent region surface and the superstrate and a second gap between the substrate and the superstrate. The apparatus may also include a gas supply system between the first gap and the second gap. The superstrate holder may alter a shape of the held superstrate to decrease the first gap and increase the second gap.