Semiconductor Capacitor Y-Shaped Base Structural Stability
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Solution Overview
Problem
As capacitors in semiconductor fabrication increase in height and decrease in size, their aspect ratio rises, leading to instability and potential collapse or twist, resulting in poor yield rates.
Innovation Solution
A method for fabricating semiconductor devices with a Y-shaped or U-shaped conductive pattern base, which includes forming a substrate with a preliminary pattern, creating openings, depositing a dielectric layer, and forming a conductive pattern with an upper portion extending from the substrate and a lower portion buried in the substrate, enhancing structural stability and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the height of capacitors increases and the size of the memory array shrinks, then the capacitance increases, but the aspect ratio rises causing instability and collapse
Solution Approach 1:
The conductive pattern is divided into multiple segments: an upper portion extending upwardly from the substrate, a middle portion, and a lower portion buried in the conductive portion. This segmentation creates a distributed structure that reduces stress concentration and prevents catastrophic collapse, while maintaining the required capacitance through increased surface area.
Solution Approach 2:
The conductive pattern employs an asymmetric Y-shaped or U-shaped configuration where the lower portion is wider and more embedded in the substrate compared to the upper portion. This asymmetric design provides a broader base for structural support while maintaining the electrical functionality, effectively lowering the aspect ratio's negative impact.
2Quantity of substance
If the height of capacitors increases, then the capacitance increases, but the capacitor may twist or collapse leading to poor yield rate
Solution Approach 1:
The lower portion of the conductive pattern is pre-formed to be buried in the conductive portion of the substrate before the upper portion is completed. This preliminary action creates a stable foundation that prevents twisting and collapse during subsequent processing steps, ensuring high yield rates while achieving the required capacitance.
Solution Approach 2:
The etch stop pattern serves as an intermediary structure between the upper and lower portions of the conductive pattern. It provides mechanical support and structural transition, preventing direct stress transmission that could cause collapse, thereby maintaining both capacitance and yield rate.
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
The Y-shaped or U-shaped structure improves the structural stability of capacitors, preventing deformation and increasing the contact area, thereby enhancing capacitance and yield rates.
Implementation Method 1
performing a dry etching process to form a hole in the conductive portion
Implementation Method 2
depositing a conductive pattern over the sidewall of the opening and in the hole
Data Source
AI summary
A method for fabricating a semiconductor device is provided. The method includes the actions of: providing a substrate comprising a preliminary pattern formed thereon; forming an opening through the preliminary pattern to expose a conductive portion in the substrate; forming a dielectric layer on a sidewall of the opening; performing a dry etching process to form a hole in the conductive portion; removing the dielectric layer; and depositing a conductive pattern over the sidewall of the opening and in the hole.