Supporter Pattern Layout for Stable High-Aspect DRAM Electrodes
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Solution Overview
Problem
In the manufacturing of semiconductor devices, ensuring uniform contact areas between supporter patterns and lower electrodes is challenging, particularly in highly integrated and miniaturized devices like DRAM, where lower electrodes with high aspect ratios are used, and there is a risk of electrode collapse during processing.
Innovation Solution
A method involving sequential stacking of a mold layer and a supporter layer on a substrate, forming capacitor holes, and patterning the supporter layer using a supporter mask pattern to create supporter holes that expose lower electrodes, ensuring uniform spacing and shape to prevent electrode collapse and facilitate uniform processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lower electrodes with high aspect ratios are used to achieve miniaturization, then capacitor capacitance is improved, but the likelihood of electrode collapse during processing increases
Solution Approach 1:
The patent introduces supporter patterns that divide and segment the space around lower electrodes, creating a grid-like structure that provides mechanical support to each electrode. This segmentation approach allows high aspect ratio electrodes to maintain structural integrity by distributing support forces through multiple supporter elements rather than relying on each electrode's self-support capability alone.
Solution Approach 2:
The supporter patterns act as intermediary structures between the lower electrodes and the surrounding environment. These supporters provide mechanical reinforcement to the lower electrodes during processing, preventing collapse while allowing the electrodes to maintain their high aspect ratio geometry for optimal capacitance performance.
2Reliability
If supporter patterns are added to prevent electrode collapse, then electrode structural stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the formation of supporter patterns with existing capacitor fabrication steps. The supporter patterns are formed using the same capacitor hole definition process, and subsequent processing steps treat supporters and electrodes together. This merging approach integrates supporter formation into the existing manufacturing flow without requiring completely separate process modules.
Solution Approach 2:
The supporter patterns serve multiple functions: they provide mechanical support to prevent electrode collapse, define capacitor hole locations, and act as etch masks during processing. This multi-functionality reduces the need for additional dedicated support structures or process steps, thereby limiting the increase in manufacturing complexity.
3Manufacturing precision
If non-uniform contact areas between supporter patterns and lower electrodes occur, then manufacturing precision deteriorates, but achieving uniform contact in miniaturized devices becomes increasingly difficult
Solution Approach 1:
The patent employs asymmetric supporter pattern designs where the supporter geometry is optimized for each specific location relative to lower electrodes. Rather than using identical symmetric supporters everywhere, the pattern adapts to local geometric requirements, allowing uniform contact areas to be achieved despite variations in electrode spacing and orientation in miniaturized configurations.
Solution Approach 2:
The patent adjusts geometric parameters of supporter patterns (such as width, length, and positioning) to compensate for variations in lower electrode dimensions and spacing. By dynamically changing supporter parameters based on local requirements, uniform contact areas are maintained across the entire device structure even as overall device size is reduced.
Data Source
AI summary
A method of manufacturing a semiconductor device includes sequentially stacking a mold layer and a supporter layer on a substrate, forming a plurality of capacitor holes passing through the mold layer and supporter layer, forming a plurality of lower electrodes filling the capacitor holes, forming a supporter mask pattern having a plurality of mask holes on the supporter layer and the lower electrodes, and forming a plurality of supporter holes by patterning the supporter layer. Each of the plurality of lower electrodes has a pillar shape, and each of the mask holes is between four adjacent lower electrodes and has a circular shape.