Wafer Bonding Membrane with Center Protrusion for Deformation Compensation
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Solution Overview
Problem
Current wafer bonding technologies face challenges in achieving accurate bonding between wafers due to uneven deformation and misalignment during the bonding process, leading to reduced productivity and increased errors in semiconductor device manufacturing.
Innovation Solution
A wafer bonding apparatus featuring a membrane member with a protrusion at its center and a planar portion on its outer region, which is pneumatically controlled to adjust the shape of the second wafer, compensating for the deformation of the first wafer and improving bonding accuracy by conformally arranging the second wafer along the membrane member's shape, while a sensor system measures and controls the bonding propagation distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional wafer bonding is performed without deformation compensation, then the bonding process is simple, but bonding accuracy deteriorates due to uneven deformation and misalignment
Solution Approach 1:
The membrane member is pre-formed with a protrusion at its center and a planar portion on its outer region before the bonding process. This preliminary shaping allows the second wafer to be conformally arranged along the membrane member's shape, compensating for deformation that will occur during bonding and improving bonding accuracy without adding complex real-time adjustment mechanisms
Solution Approach 2:
The membrane member features different geometries in different regions: a protrusion at the center portion and a planar portion on the outer region. This local differentiation allows selective compensation for deformation in different areas of the wafer, with the protrusion addressing center portion deformation and the planar portion addressing outer region deformation, thereby improving overall bonding accuracy
2Productivity
If wafer deformation is not compensated, then the equipment structure is simple, but misalignment increases reducing productivity
Solution Approach 1:
The membrane member serves as an intermediary element between the bonding chucks. By conformally arranging the second wafer along the membrane member's shaped surface, the membrane acts as a mediator that transfers and compensates for deformation, ensuring accurate alignment and improving bonding productivity without requiring complex real-time adjustment equipment
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 solution enhances bonding accuracy by compensating for deformation and reducing misalignment, thereby improving the overall precision and efficiency of the wafer bonding process, leading to higher productivity and reduced errors in semiconductor device manufacturing.
Implementation Method 1
which is pneumatically controlled to adjust the shape of the second wafer, compensating for the deformation of the first wafer
Data Source
AI summary
A wafer bonding apparatus includes a first bonding chuck to fix a first wafer on a first surface thereof, a second bonding chuck to fix a second wafer on a second surface thereof facing the first surface, a bonding initiation member at a center of the first bonding chuck to push the first wafer towards the second surface, and a membrane member including a protrusion protruding from a center portion of the second surface towards the first surface, and a planar portion defining the protrusion on an outer region surrounding the center portion.