High-Profile Capacitor Electrode Segmentation for Stability
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Solution Overview
Problem
As semiconductor devices become smaller, maintaining sufficient capacitance in capacitors becomes challenging due to the increased difficulty in manufacturing lower electrodes with large aspect ratios, which are prone to collapse.
Innovation Solution
A method for manufacturing capacitors involves forming a substrate with multiple layers, including dielectric material mold and supporter layers, to support the lower electrode and enable its formation with a high aspect ratio, using ashing to remove these layers completely, and subsequent deposition of dielectric and upper electrodes to achieve increased capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the height of the lower electrode is increased to maintain sufficient capacitance in smaller semiconductor devices, then the capacitance is improved, but the lower electrode becomes prone to collapse due to large aspect ratio
Solution Approach 1:
The patent divides the lower electrode into multiple segments along its height, with each segment having a different width. The lower electrode includes a first lower electrode segment at the bottom with a first width, and a second lower electrode segment above it with a second width that is narrower than the first width. This segmentation allows the lower electrode to achieve greater height while maintaining stability by distributing the structural load across multiple segments with varying dimensions.
Solution Approach 2:
The patent applies local quality by making different parts of the lower electrode have different widths at different heights. The bottom portion (first lower electrode segment) has a larger width for stability and support, while the upper portion (second lower electrode segment) has a narrower width to reduce overall capacitance requirements and improve aspect ratio. This localized variation in geometry optimizes both stability and capacitance performance.
2Quantity of substance
If the height of the lower electrode is increased to maintain sufficient capacitance, then the capacitance is improved, but the manufacturing difficulty increases due to process complexity
Solution Approach 1:
The patent employs preliminary action by forming mandrels before depositing the lower electrode material. The mandrels are patterned with the desired multi-segment geometry, and then the lower electrode is deposited conformally over the mandrels. This preliminary structuring allows the complex multi-segment lower electrode to be formed using standard deposition processes, rather than requiring complex lithography and etching steps to create the varying width profile.
Solution Approach 2:
The patent uses mandrels as an intermediary structure to transfer the desired lower electrode geometry from a patterning step to the final electrode structure. The mandrels serve as a temporary template that defines the width variations of the lower electrode segments, allowing the actual electrode material to be deposited in a simple conformal manner. After deposition, the mandrels are removed, leaving the precisely shaped lower electrode.
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 method allows for the successful formation of lower electrodes with higher aspect ratios, enhancing capacitance while preventing collapse, thereby addressing the challenge of maintaining capacitance in smaller semiconductor devices.
Implementation Method 1
using ashing to remove these layers completely
Data Source
AI summary
A method for manufacturing a high-profile capacitor with high capacity includes providing a substrate, forming a first mold layer, a first supporter layer, a second mold layer, and a second supporter layer on the substrate, where at least one of the first mold layer and the second mold layer are made of a dielectric material having a low or super low dielectric constant, defining at least one contact hole, where the now-surrounding first and second supporter layers reinforce the at least one contact hole and form first and second supporter patterns respectively, forming a lower electrode on an inner surface of the at least one contact hole, and removing the first mold layer and/or the second mold layer being made of the dielectric material by ashing.