Capacitor With Non-Linear Sidewalls Reducing Bit Line Resistance
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Solution Overview
Problem
Current semiconductor arrangements face challenges in efficiently integrating capacitors with bit lines, leading to increased resistance and parasitic capacitance, which affects the performance and efficiency of memory regions in semiconductor devices.
Innovation Solution
The semiconductor arrangement incorporates a capacitor design with non-linear sidewalls and a specific structure that includes a first electrode with a non-linear sidewall surrounding an open space, an insulating layer with a non-linear sidewall, and a second electrode with a non-linear sidewall, positioned over the bit line, using techniques like atomic layer deposition and chemical vapor deposition to form dielectric and metal structures, thereby reducing resistance and increasing capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional capacitor structures are used with bit lines, then the structure is simple to manufacture, but resistance increases and parasitic capacitance increases
Solution Approach 1:
The capacitor electrode is designed with a curved, non-linear sidewall profile instead of a straight vertical wall. This curvature increases the surface area of the electrode that contacts the dielectric layer, thereby increasing capacitance without requiring additional horizontal space. The curved profile also optimizes the electric field distribution, reducing parasitic capacitance effects.
Solution Approach 2:
The invention transitions from a two-dimensional planar capacitor structure to a three-dimensional structure with vertical sidewalls that curve in the vertical dimension. By utilizing the vertical space and creating a non-linear profile along the height of the capacitor, the design increases capacitance density without expanding the footprint area, effectively adding a dimensional aspect to the capacitor geometry.
2Reliability
If capacitor size is increased to increase capacitance, then capacitance increases, but area occupied increases
Solution Approach 1:
The curved sidewall profile maximizes the surface area of the electrode within the vertical dimension. By curving the sidewall outward, the electrode surface area increases without increasing the horizontal footprint. This allows higher capacitance to be achieved within the same planar area allocation.
Solution Approach 2:
The solution moves the capacitance enhancement from the horizontal plane to the vertical dimension. Instead of expanding the capacitor footprint area, the design utilizes the vertical height and creates a non-linear profile along this dimension, effectively trading vertical space for increased capacitance while maintaining a compact footprint.
3Reliability
If resistance between bit line and capacitor is reduced by changing structure, then resistance decreases, but manufacturing complexity increases
Solution Approach 1:
The curved sidewall design optimizes the electrical connection between the bit line and the capacitor electrode by creating a more gradual transition zone. This curvature reduces sharp corners and edges that can cause field concentration and increase resistance, thereby improving electrical connectivity while maintaining a relatively simple single-step deposition process.
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 configuration reduces resistance between the bit line and the capacitor, decreases parasitic capacitance, and enhances the capacitance of the capacitor, improving the overall performance and efficiency of the semiconductor arrangement.
Implementation Method 1
using techniques like atomic layer deposition and chemical vapor deposition to form dielectric and metal structures
Implementation Method 2
using techniques like atomic layer deposition and chemical vapor deposition to form dielectric and metal structures
Data Source
AI summary
A semiconductor arrangement includes an active region including a semiconductor device. The semiconductor arrangement includes a capacitor. The capacitor includes a first electrode over at least one dielectric layer over the active region. The first electrode surrounds an open space within the capacitor. The first electrode has a non-linear first electrode sidewall.