Wafer Grinding Layout for Simultaneous Front and Back Surface Processing
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Solution Overview
Problem
Conventional semiconductor manufacturing processes face challenges in simultaneously addressing back surface and front surface protrusions on wafers during epitaxial growth, as existing grinding devices can only process one side at a time, leading to inefficiencies and increased processing time.
Innovation Solution
A semiconductor manufacturing apparatus that holds one surface of the wafer and simultaneously grinds both the back and front surfaces using separate grinding units, allowing for simultaneous processing of both sides, thereby reducing processing time and improving throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional grinding device holds the front surface of the wafer and grinds the back surface, then the back surface protrusion can be removed, but the front surface protrusion cannot be removed simultaneously
Solution Approach 1:
The invention divides the grinding function into two separate grinding devices: one for grinding the back surface while the wafer is held by the front surface, and another for grinding the front surface while the wafer is held by the back surface. This segmentation allows each device to specialize in one surface processing task, resolving the contradiction by enabling independent operation on each surface without interference from the holding mechanism.
Solution Approach 2:
The invention creates a universal processing system that can handle both front surface and back surface protrusion removal through two complementary grinding devices. Each device is designed to perform a specific function (grinding one surface), but together they provide complete coverage for both surfaces, achieving multi-functionality at the system level that resolves the versatility limitation.
2Reliability
If the wafer is held on one surface for grinding, then stable holding is achieved, but the opposite surface cannot be processed simultaneously
Solution Approach 1:
The processing operation is segmented into two parallel streams: one stream processes the back surface while maintaining stable holding on the front surface, and the other stream processes the front surface while maintaining stable holding on the back surface. This segmentation eliminates the sequential time loss by running both operations simultaneously, each with its own stable holding configuration.
Solution Approach 2:
The invention enables continuous useful action by allowing both front and back surface processing to occur simultaneously without interruption. Instead of completing one surface processing before starting the other (which would create idle time), both grinding operations proceed in parallel, maximizing the continuity and efficiency of the manufacturing process.
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
Enables efficient removal of back surface and front surface protrusions on wafers, reducing processing time and improving manufacturing efficiency by allowing simultaneous grinding of both surfaces, thus addressing the limitations of conventional methods.
Implementation Method 1
a first grinding unit that rotates about a rotation axis that overlaps a center of the wafer in plan view and extends in a direction perpendicular to the first main surface, and that grinds an outer periphery
Data Source
AI summary
Provided is a semiconductor manufacturing apparatus that is capable of, while holding one surface of the wafer, grinding the holding surface of a wafer. A semiconductor manufacturing apparatus includes a first main surface holding unit that comes into contact with a center portion of a first main surface of a wafer in plan view and holds the wafer, and a first grinding unit that rotates about a rotation axis that overlaps a center of the wafer in plan view and extends in a direction perpendicular to the first main surface, and that grinds an outer periphery that is a region surrounding the center portion of the first main surface in contact with the outer periphery of the first main surface.