Segmented Vacuum Pin Stage for Warped Wafer Planarization
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Solution Overview
Problem
The increasing density and decreasing thickness of semiconductor wafers lead to warpage issues, causing chucking failures and design errors during manufacturing, which necessitate effective loading and planarization techniques to ensure reliable semiconductor device fabrication.
Innovation Solution
A substrate processing apparatus with a stage featuring first and second regions, equipped with pins that absorb substrates using negative pressure, where the first pins elevate and adsorb the substrate initially, followed by the second pins, allowing for concurrent elevation and adsorption to planarize warped wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If wafers are made thinner to increase integration density, then manufacturing capacity and integration level improve, but warpage occurs causing chucking failure
Solution Approach 1:
The chucking system is segmented into multiple regions (first region with first pins, second region with second pins) that can be controlled independently. This allows selective elevation and adsorption of different pin groups to handle warped wafers effectively while maintaining high integration density requirements.
Solution Approach 2:
Different regions of the stage are assigned different functions: the first region is used for initial adsorption and planarization, while the second region provides additional support. This local differentiation allows the system to adapt to local warpage variations across the wafer surface.
2Reliability
If multiple pins are used to adsorb warped substrates, then chucking reliability improves, but the complexity of controlling concurrent elevation increases
Solution Approach 1:
The pin array is divided into multiple independently controllable groups (first pins and second pins). Each group can be elevated and lowered separately, allowing simplified control of complex warpage compensation by treating it as a series of simpler, staged operations rather than coordinating all pins simultaneously.
Solution Approach 2:
The first pins are elevated and engage the substrate before the second pins are activated. This preliminary action establishes initial contact and begins the planarization process, making the subsequent engagement of second pins easier to control and reducing the overall control complexity.
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 method effectively loads and planarizes substrates with warpage, enhancing the reliability of semiconductor device fabrication by preventing chucking failures and ensuring precise processing.
Implementation Method 1
a plurality of pins in or on the stage and configured to adsorb the substrate with negative pressure
Data Source
AI summary
A substrate processing apparatus includes: a stage including a first region and a second region surrounding the first region, the stage configured to receive a substrate; and a plurality of pins in or on the stage and configured to adsorb the substrate with negative pressure. The plurality of pins include a plurality of first pins in the first region and are configured to be elevated at the same time, and a plurality of second pins in the second region and are configured to be elevated at the same time. In operation, the first pins are elevated and adsorb the substrate first, and then, the second pins are elevated and adsorb the substrate.