Decoupling Capacitor Support Structure for High-Aspect Stability
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Solution Overview
Problem
Cell capacitors and decoupling capacitors in DRAM devices have a high aspect ratio, making them prone to falling down, and the support structures are susceptible to damage and cracking.
Innovation Solution
A decoupling capacitor structure is designed with an insulating division pattern, conductive pads, lower electrodes, a support structure, a dielectric layer, and an upper electrode structure, where the support structure contacts the sidewalls of the lower electrodes, connecting them and forming openings between specific electrodes to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the aspect ratio of cell capacitors and decoupling capacitors is increased, then the capacitor density is improved, but the structural stability deteriorates causing the capacitors to fall down
Solution Approach 1:
The support structure is divided into multiple segments including a first support pattern and a second support pattern, with the second support pattern having openings between adjacent first lower electrodes. This segmentation allows the support structure to provide stability while accommodating the high aspect ratio capacitors without causing them to fall down.
Solution Approach 2:
The support structure extends in both first and second directions from the conductive pad, creating a three-dimensional support framework. The first support pattern extends in a first direction while the second support pattern extends in a second direction, providing multi-directional support for the high aspect ratio capacitors.
2Stability of the object's composition
If the support structure is made continuous to improve stability, then the capacitors are better supported, but cracks may form in the support structure under external impact
Solution Approach 1:
The support structure is segmented into first and second support patterns with controlled openings, preventing crack propagation while maintaining overall stability. The openings between adjacent first lower electrodes act as crack arrestors, allowing the support structure to withstand external impact without forming continuous cracks.
Solution Approach 2:
The support structure is designed with openings and patterns that beforehand cushion and distribute external impact forces. The second support pattern with openings provides a cushioning effect that prevents stress concentration, reducing the likelihood of crack formation under external impact.
3Stability of the object's composition
If the support structure contacts all lower electrodes to maximize support, then structural stability is improved, but the complexity of the support structure increases
Solution Approach 1:
The support structure is segmented into first and second support patterns with specific contact regions. The first support pattern contacts the first lower electrodes while the second support pattern contacts the second lower electrodes, providing stable support without requiring uniform contact with all electrodes, thus reducing complexity.
Solution Approach 2:
Different regions of the support structure have different contact characteristics. The first support pattern provides support at specific locations while the second support pattern provides support at other locations, creating local quality variations that optimize stability while minimizing overall complexity.
Data Source
AI summary
A decoupling capacitor structure includes an insulating division pattern, conductive pads, lower electrode sets, a support structure, a dielectric layer, and an upper electrode structure. The conductive pads are at opposite sides of the insulating division pattern. The lower electrode sets are spaced apart from each other in a horizontal direction on each conductive pad. The support structure contacts and connects sidewalls of the lower electrodes. The dielectric layer is on the lower electrodes and the support structure. The upper electrode structure is on the dielectric layer. The lower electrode sets include first lower electrodes adjacent to the insulating division pattern and second lower electrodes spaced apart from the first lower electrodes in the horizontal direction. The support structure defines an opening between the second lower electrodes. The opening is not formed between the first lower electrodes or between the first lower electrodes the second lower electrodes.