Semiconductor Bit Line Air Spacer Structural Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing demand for smaller and more integrated semiconductor devices poses challenges in maintaining effective design rules and structural integrity, particularly in the design of bit line structures and contact structures within semiconductor devices.
Innovation Solution
The semiconductor device incorporates a first bit line structure between contact structures, with a first air spacer and a separation space, and a cover insulating pattern with a gap portion, where the air capping pattern seals the separation space, enhancing structural integrity and reducing capacitance between contact structures and bit lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If design rules are decreased to increase integration density, then productivity and integration level improve, but structural integrity and manufacturing precision deteriorate
Solution Approach 1:
The patent divides the contact structure into multiple segments: a first contact structure, a bit line structure, and a second contact structure. Air spacers and separation spaces are introduced between these segments to maintain structural integrity while achieving higher integration density. This segmentation allows each component to be optimized independently for both precision and density.
Solution Approach 2:
Air spacers and separation spaces serve as intermediary elements between the contact structures and bit line structure. These intermediaries provide physical separation and structural support, enabling the device to maintain manufacturing precision while achieving higher integration through reduced spacing between functional elements.
2Area of stationary object
If contact structures are positioned closer to bit lines to reduce device area, then area reduction is achieved, but capacitance between structures increases
Solution Approach 1:
Air spacers are introduced as intermediary structures between the contact structures and bit lines. Since air has very low dielectric constant compared to conventional insulating materials, these air spacers effectively reduce capacitance between adjacent structures even when positioned in close proximity, enabling area reduction without sacrificing electrical performance.
Solution Approach 2:
The patent utilizes air (gas) as the insulating medium in the form of air spacers and separation spaces. This pneumatic approach leverages the low dielectric constant of air to minimize parasitic capacitance between conductive structures, allowing closer spacing and thus smaller device area while maintaining electrical isolation.
3Object-generated harmful factors
If air spacers are introduced to reduce capacitance, then capacitance between structures decreases, but device complexity increases
Solution Approach 1:
The air spacers are formed through a self-aligned process where the sacrificial spacer is removed to create the air spacer in situ. This self-service approach eliminates the need for separate alignment and formation steps for air spacers, reducing process complexity despite the additional structural elements. The separation spaces similarly form automatically through the removal of sacrificial materials.
Data Source
AI summary
A first bit line structure is disposed between a first contact structure and a second contact structure. A first air spacer is interposed between the first contact structure and the first bit line structure. A first separation space is connected to an air entrance of the first air spacer and interposed between the first contact structure and the first bit line structure. A cover insulating pattern with a gap portion is interposed between the first contact structure and the second contact structure. The gap portion has a downwardly-decreasing width. An air capping pattern covers the cover insulating pattern to seal the first separation space.