Memory Bit Line Contact Structure With Air Spacer Capacitance Reduction
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Solution Overview
Problem
Current semiconductor memory devices face challenges in integrating advanced features due to limitations in exposure techniques and material integration, particularly in the design and structure of bit line and storage node contacts, which affect performance and integration density.
Innovation Solution
The semiconductor memory device incorporates a specific structure with a capping pattern made of metallic material between the bit line and storage node contacts, including spacers and air gaps, to enhance integration and reduce parasitic capacitance, featuring a metallic capping pattern that defines the top surface of an air spacer and is in contact with the landing pad, thereby improving the device's performance and integration density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional exposure techniques are used for high integration, then manufacturing cost increases, but integration density improves
Solution Approach 1:
The patent introduces air gaps (void spaces) between the bit line structure and landing pad, creating a three-dimensional structural solution that reduces parasitic capacitance without requiring advanced exposure techniques. This dimensional approach (adding vertical spacing through air gaps) allows conventional manufacturing to achieve better performance.
2Productivity
If bit line and storage node contacts are closely integrated, then integration density improves, but parasitic capacitance increases
Solution Approach 1:
The patent introduces air gaps as intermediary spaces between the bit line structure and landing pad. These air gaps act as mediators that physically separate conductive elements, thereby reducing parasitic capacitance while maintaining close integration. The air gap serves as an electrical insulator that allows structural proximity without electrical interference.
3Reliability
If complex spacer structures are added to reduce parasitic capacitance, then performance improves, but device complexity increases
Solution Approach 1:
The patent divides the spacing function into multiple segments: a first spacer, a second spacer, and air gaps. This segmentation allows each component to serve a specific purpose in reducing parasitic capacitance at different locations, achieving better performance while maintaining manufacturability through modular structure design.
Data Source
AI summary
A semiconductor device including a substrate includes an active region. A bit line structure extends across the active region. A landing pad is disposed on an end portion of the active region. A first spacer is disposed between the bit line structure and the landing pad. A second spacer is disposed between the first spacer and the landing pad. An air spacer is disposed between the first spacer and the second spacer. A capping pattern is disposed between a sidewall of the landing pad and a sidewall of the bit line structure. The capping pattern defines a top surface of the air spacer and comprises a metallic material.