Non-Flat Chuck Surface for Wafer Shape Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor processing equipment struggles with handling wafers that deviate from a perfectly flat shape due to deformations and stress, leading to downstream process difficulties and increased costs from compensatory measures like additional film deposition.
Innovation Solution
Designing a chuck with a non-flat, shaped surface that compensates for anticipated wafer shape changes during processing, ensuring a flatter wafer profile post-processing by utilizing precise curvature configurations based on characterized wafer data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional flat chuck is used to hold the wafer, then the chuck structure is simple and easy to manufacture, but the wafer shape deviates from flatness after processing due to deformations and stress
Solution Approach 1:
The chuck surface is pre-shaped with a non-flat configuration that anticipates and counteracts the expected wafer deformations and stress-induced shape changes during processing. This preliminary counter-action ensures the wafer maintains proper flatness after processing, resolving the contradiction between simple chuck structure and high manufacturing precision.
Solution Approach 2:
The invention applies curved or non-flat surface geometry to the chuck instead of a conventional flat surface. This curvature is specifically designed to compensate for wafer shape deviations, allowing the chuck to restore wafer flatness while accounting for processing-induced deformations, thus improving manufacturing precision without excessive complexity.
2Manufacturing precision
If additional film deposition is performed to compensate for wafer shape deviations, then wafer flatness can be improved, but the process flow becomes more complex and costs increase
Solution Approach 1:
The chuck is pre-configured with a non-flat surface that performs the compensation function before processing begins. This preliminary action eliminates the need for additional compensatory film deposition steps, maintaining high manufacturing precision while preserving process flow efficiency and productivity.
Solution Approach 2:
The compensation function is extracted from the process steps (film deposition) and integrated into the chuck structure itself. This extraction eliminates unnecessary process steps and material deposition, simplifying the overall process flow while maintaining the ability to correct wafer shape deviations.
3Manufacturing precision
If additional process steps are added to compensate for wafer shape changes, then manufacturing precision can be maintained, but production time and costs increase
Solution Approach 1:
The wafer holding function and the shape compensation function are merged into a single integrated chuck structure. The non-flat surface of the chuck simultaneously performs both functions, eliminating the need for separate compensation process steps and reducing overall processing time while maintaining manufacturing precision.
Solution Approach 2:
The compensation for wafer shape changes is performed in advance through the pre-configured non-flat chuck surface, before the actual processing begins. This eliminates the need for time-consuming additional process steps after processing, thereby maintaining precision while reducing total processing time.
Data Source
AI summary
An embodiment of an apparatus may include a chuck body, and a surface formed on the chuck body to hold a wafer, where the surface has a non-flat shape. Other embodiments are disclosed and claimed.