Porous Insulating Layer Air Gap Control in Semiconductor Gate Structures
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Solution Overview
Problem
Current semiconductor devices face challenges in maintaining reliability and interference characteristics due to variations in air gap sizes and shapes between gate structures, which affect data storage and retrieval efficiency.
Innovation Solution
The semiconductor device incorporates a porous insulating layer with a specific etch rate and a metal protection layer, strategically positioned between gate structures to define uniform air gaps and prevent metal gate pattern erosion during thermal oxidation, enhancing interference characteristics and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If air gaps are formed between gate structures without precise control, then manufacturing is simpler, but air gap uniformity and device reliability deteriorate
Solution Approach 1:
A porous insulating layer is introduced as an intermediary material between the gate structures to precisely define and control air gaps. This layer acts as a spacer that maintains uniform spacing between adjacent gate structures, ensuring consistent air gap dimensions without requiring complex direct positioning methods.
Solution Approach 2:
The patent utilizes a porous insulating layer with controlled porosity to define air gaps. The porous structure allows for precise dimensional control and uniform distribution of air gaps between gate structures, while the material properties enable appropriate etch rates during fabrication to achieve the desired gap uniformity.
2Reliability
If metal gate patterns are exposed to thermal oxidation without protection, then oxidation process is simpler, but metal gate pattern erosion occurs
Solution Approach 1:
A metal protection layer is deposited on the metal gate patterns before the thermal oxidation process. This preliminary protective coating prevents erosion of the metal gate patterns during subsequent high-temperature oxidation steps, ensuring pattern integrity and device reliability.
Solution Approach 2:
The metal protection layer serves as an intermediary barrier between the metal gate patterns and the oxidizing environment. This protective layer shields the metal patterns from direct exposure to oxidizing conditions, preventing erosion while allowing the oxidation process to proceed in other regions.
3Productivity
If air gap sizes vary between gate structures, then manufacturing is easier, but data storage and retrieval efficiency deteriorate
Solution Approach 1:
The porous insulating layer acts as a standardized intermediary component that ensures uniform air gap dimensions across all gate structures. By using this consistent spacer layer, the patent achieves precise control over air gap sizes, which is critical for maintaining uniform electrical characteristics and efficient data storage operations.
Solution Approach 2:
The patent controls the physical and chemical parameters of the porous insulating layer, including its thickness, porosity, and etch rate, to achieve precise air gap dimensions. By optimizing these parameters, uniform air gaps are formed that ensure consistent device performance and high data storage efficiency.
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 improves the uniformity and reliability of air gaps between gate structures, thereby enhancing data storage efficiency and preventing metal gate pattern erosion, leading to improved semiconductor device performance.
Implementation Method 1
the porous insulating layer may include an insulating material having an etch rate of about 100-200 Å/min while being etched by a wet etching process using 200:1 HF etching solution
Implementation Method 2
a metal protection layer between the insulating layer and the porous insulating layer
Data Source
AI summary
A semiconductor device includes a plurality of gate structures on a substrate, the plurality of gate structures including a gate metal pattern and delimiting air gaps formed therebetween, an insulating layer on the plurality of gate structures, and a porous insulating layer between the plurality of gate structures and the insulating layer, the porous insulating layer configured to cross the plurality of gate structures to delimit the air gaps.