Semiconductor Substrate Stack Spacer for Edge Deposition Masking
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Solution Overview
Problem
Current semiconductor edge deposition processes are inefficient for processing multiple substrates in a single stack, as they lack effective methods to separate and mask central portions of substrates during material deposition.
Innovation Solution
The use of spacers attached to semiconductor substrates to create a gap between adjacent substrates, allowing for the deposition of material on exposed edge surfaces while masking the central portions, and enabling convenient stacking and protection during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple substrates are processed in a single stack using known deposition techniques, then processing efficiency is improved, but the ability to selectively deposit material on edge surfaces while masking central portions deteriorates
Solution Approach 1:
The substrate stack is segmented into distinct regions using spacers that physically divide the stack. Each spacer creates a gap between substrates, establishing clear separation between edge surfaces requiring deposition and central portions requiring masking. This segmentation enables selective material deposition on edge surfaces while protecting central regions, resolving the contradiction between processing efficiency and selective deposition control.
Solution Approach 2:
Spacers serve as intermediary elements introduced between adjacent substrates in the stack. These spacers act as masking structures that prevent deposition material from reaching central portions of substrates while allowing edge surfaces to be coated. The intermediary spacer structure enables simultaneous processing of multiple substrates with precise spatial control over material deposition.
2Productivity
If substrates are stacked closely together for efficient processing, then space utilization is improved, but the ability to access and deposit material on exposed edge surfaces deteriorates
Solution Approach 1:
The spacer structures divide the substrate stack into discrete segments with defined gaps. Each gap provides an accessible pathway to the edge surfaces of substrates while maintaining close stacking for space efficiency. The segmented structure allows deposition equipment to access edge surfaces through the gaps created by spacers, resolving the contradiction between space utilization and edge surface accessibility.
Solution Approach 2:
The spacers create vertical gaps between substrates in the stack, introducing a dimensional pathway for material deposition. Instead of requiring lateral access that would reduce stacking density, the spacers open vertical channels through which deposition material can reach edge surfaces. This dimensional approach maintains high space utilization while ensuring edge surface accessibility.
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 solution allows for efficient processing of multiple substrates in a stack by providing a clear path for edge deposition while shielding central areas, enhancing the convenience of substrate stacking and protecting sensitive components during subsequent processing steps.
Implementation Method 1
the spacer defines the gap and masks a central portion of each respective semiconductor substrate
Implementation Method 2
the deposition of a material on the exposed edge surface
Data Source
AI summary
Described is a semiconductor substrate stack, including: a plurality of semiconductor substrates arranged in a stack in which the semiconductor substrates include opposing facing surfaces, wherein the facing surfaces of adjacent semiconductor substrates are separated by a gap, each semiconductor substrate having an edge surface at an exposed edge of the stack. A spacer is attached to one of the facing surfaces of each of the at least one of the semiconductor substrates and extends between adjacent semiconductor substrates to define the gap and mask a central portion of each respective semiconductor substrate.