Insulating Support Layer for Storage Electrode Collapse
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Solution Overview
Problem
As semiconductor integrated circuit devices scale down, the area available for forming capacitors decreases, necessitating increased capacitance to maintain refresh characteristics, but this can lead to storage node collapse due to increased height, resulting in defect formation.
Innovation Solution
The integration of storage electrode landing pads and an insulating support layer on the substrate, where the storage electrodes extend beyond the landing pads and the insulating support layer covers the sidewalls, forming capacitors with a dielectric layer and a plate electrode, thereby supporting storage nodes and reducing the likelihood of collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the height of storage node is increased to increase capacitance, then capacitance is improved, but the likelihood of storage node collapse increases
Solution Approach 1:
The storage node structure is segmented into multiple components: landing pads at the base, insulating support layers providing lateral reinforcement, and conductive fillers within the insulating layer. This segmentation allows the tall storage node to be supported by distributed structural elements rather than relying solely on the integrity of the continuous storage node material, thereby preventing collapse while maintaining height and capacitance.
Solution Approach 2:
An insulating support layer with conductive filler acts as an intermediary structure between the substrate and the storage node. This intermediary provides mechanical support to the tall storage node, distributing the structural load and preventing collapse, while the conductive filler ensures proper electrical connectivity. This mediator enables the storage node to achieve greater height for increased capacitance without sacrificing reliability.
2Productivity
If the scale of integration is increased, then device density is improved, but the area available for forming capacitor decreases
Solution Approach 1:
The invention transitions from a two-dimensional capacitor footprint to a three-dimensional structure by adding vertical height to the storage node and incorporating an insulating support layer with conductive filler. This dimensional change allows capacitance to be increased in the vertical dimension rather than requiring additional horizontal area, thereby enabling higher device density while maintaining sufficient capacitor area for reliable operation.
3Quantity of substance
If storage electrodes extend beyond landing pads, then capacitance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The landing pads are formed in advance as predefined structures on the substrate before the storage electrodes are deposited. These pre-formed landing pads serve as templates that guide the subsequent formation of storage electrodes, ensuring proper alignment and positioning. This preliminary action reduces manufacturing precision requirements by providing a physical reference structure that simplifies the alignment process.
Solution Approach 2:
The insulating support layer with conductive filler is applied selectively in specific regions where storage electrodes are formed, rather than uniformly across the entire device. This localized application provides structural support precisely where needed for tall storage nodes that extend beyond landing pads, while maintaining manufacturing feasibility through region-specific processing.
Data Source
AI summary
An integrated circuit device may include a substrate, a plurality of storage electrode landing pads on the substrate, and a plurality of storage electrodes. Each of the plurality of storage electrodes may be on a portion of a respective one of the plurality of storage electrode landing pads. In addition, an insulating support layer may be on the substrate, on portions of the storage electrode landing pads that are free of the storage electrodes, and on portions of sidewalls of storage electrodes. Moreover, portions of sidewalls of the storage electrodes may be free of the insulating support layer. Related methods and structures are also discussed.