Bit Line Insulation With Air Interlayers for Lower Parasitic Capacitance
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Solution Overview
Problem
The increasing integration of semiconductor storage devices leads to a decrease in sensing tolerance and reading speed due to the parasitic capacitance between the bit line and storage node contact, which is exacerbated by the reduced distance between these components.
Innovation Solution
The formation of bit line structures with insulation structures featuring air interlayers on their side walls, where the height of the air interlayers exceeds the conductive layer, reducing the dielectric constant and thereby minimizing parasitic capacitance between the bit line and storage node contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between bit line and storage node contact is reduced to increase integration, then device integration is improved, but parasitic capacitance increases
Solution Approach 1:
An insulation structure with air interlayer is introduced as an intermediary between the bit line and storage node contact. The air interlayer acts as a mediator with low dielectric constant properties that reduces the parasitic capacitance coupling between these two conductive elements, allowing them to be positioned closer together without suffering from excessive capacitive interference.
Solution Approach 2:
The insulation structure employs a composite material system consisting of solid insulating material and air voids (air interlayer). This composite structure leverages the low dielectric constant of air combined with the mechanical support and coverage of solid insulating material, achieving both electrical isolation and structural integrity while minimizing parasitic capacitance.
2Productivity
If the distance between bit line and storage node contact is reduced, then integration is improved, but sensing tolerance decreases
Solution Approach 1:
The insulation structure with air interlayer serves as an intermediary that electrically isolates the bit line from the storage node contact, reducing parasitic capacitance. This reduction in parasitic capacitance directly improves sensing tolerance by minimizing the capacitive loading and interference that would otherwise degrade the precision of memory cell sensing operations.
3Productivity
If the distance between bit line and storage node contact is reduced, then integration is improved, but reading speed decreases
Solution Approach 1:
The insulation structure with air interlayer acts as an intermediary that reduces parasitic capacitance between the bit line and storage node contact. By minimizing this capacitive coupling, the RC time constant of the bit line is reduced, thereby improving the reading speed and signal transition time without sacrificing integration benefits.
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 reading capacity of memory devices by reducing parasitic capacitance, thus improving sensing tolerance and overall performance.
Implementation Method 1
the parasitic capacitance between the BL and the NC
Implementation Method 2
reducing the dielectric constant and thereby minimizing parasitic capacitance
Data Source
AI summary
A semiconductor structure and a method for forming a semiconductor structure are provided. The method includes: a substrate is provided; bit line contact holes spaced apart from each other, bit line contacts each in contact with a part of a respective one of the bit line contact holes, and bit line structures are formed on the substrate, where each of the bit line structures includes at least a conductive layer and an insulating cap layer, and the insulating cap layer is located on the conductive layer; first insulating layers completely filling the bit line contact holes are formed inside the bit line contact holes; and insulation structures with air interlayers are formed on two side walls of the bit line structures, where a height of each of the air interlayers is greater than a height of the conductive layer of each of the bit line structures.