Semiconductor Guard Region Encapsulating Residue for Patterning Precision
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Solution Overview
Problem
Current semiconductor fabrication methods face challenges in efficiently forming semiconductor arrangements with high-k dielectric materials and metal gates, particularly in achieving precise patterning and minimizing contamination risks associated with residue layers.
Innovation Solution
The method involves forming a semiconductor arrangement with a guard region that encapsulates residue layers, using a first layer of semiconductor material over both active and non-active regions, and patterning it to maintain specific portions for further processing, followed by the deposition of a second layer to form a guard region adjacent to the active region, thereby reducing the number of operations and masks required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple patterning operations and masks are used to form semiconductor arrangements with high-k dielectric and metal gate, then precise patterning can be achieved, but the fabrication process complexity and number of operations increase
Solution Approach 1:
The patent combines multiple patterning operations into a single self-aligned process. The mandrel structure is formed first, then the high-k dielectric and metal gate layers are deposited and patterned in a self-aligned manner relative to the mandrel, eliminating the need for separate patterning steps and masks that would otherwise be required.
Solution Approach 2:
The mandrel structure is formed in advance as a self-aligned reference feature before the actual device patterning. This preliminary structure serves as a template that automatically defines the positions of subsequent layers, pre-establishing the geometric relationships needed for precise patterning without requiring additional alignment operations.
2Ease of manufacture
If residue layers are left from patterning operations, then material is preserved for subsequent processing, but contamination risks increase
Solution Approach 1:
The patent extracts and isolates the residue layers by enclosing them within a dedicated isolation structure. The isolation structure is formed to completely surround the residue from previous patterning operations, separating them from the active device regions and preventing contamination while preserving the material for potential reuse or controlled removal.
Solution Approach 2:
The residue layers are nested within the isolation structure, with the residue contained inside the enclosed space defined by the isolation structure. This nesting arrangement allows the residue to be preserved without exposing it to the rest of the fabrication environment, thereby minimizing contamination risks while maintaining material availability.
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 approach enhances the precision of semiconductor arrangement formation, reduces contamination risks, and simplifies the fabrication process by combining patterning operations and minimizing the number of masks needed, while ensuring accurate placement and shape retention of semiconductor materials.
Implementation Method 1
forming a first layer of semiconductor material over both an active region and a non-active region
Implementation Method 2
forming a first layer of semiconductor material over both an active region and a non-active region
Implementation Method 3
forming a second layer of semiconductor material over the first portion, the second portion and the second area
Implementation Method 4
forming a second layer of semiconductor material over the first portion, the second portion and the second area
Data Source
AI summary
A semiconductor arrangement is provided comprising a guard region. The semiconductor arrangement comprises an active region disposed on a first side of the guard region. The active region comprises an active device. The guard region of the semiconductor arrangement comprises residue from the active region. A method of forming a semiconductor arrangement is also provided.