Cylindrical Capacitor Electrode Pore Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in manufacturing semiconductor devices with high integration density is enhancing capacitor capacitance without compromising reliability due to limitations in reducing dielectric layer thickness, which increases leakage current, and the non-uniform formation of high dielectric constant materials.
Innovation Solution
A method involving the formation of a first and second lower electrode with a cylindrical structure, where the second lower electrode has a three-dimensional network of pores, enhancing the effective area and capacitance by using a micelle structure and surfactant self-assembly to control pore dimensions and ensure uniform dielectric layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the dielectric layer is reduced to enhance capacitance, then the capacitance increases, but leakage current increases and reliability deteriorates
Solution Approach 1:
The invention transitions from a planar capacitor structure to a three-dimensional cylindrical capacitor structure with vertical stacking. This dimensional change allows the capacitor to achieve larger capacitance without reducing dielectric layer thickness, as the capacitance is enhanced through increased effective area in the vertical dimension rather than by thinning the dielectric layer.
Solution Approach 2:
The invention employs a nested structure where the dielectric layer is positioned between two electrode layers (first electrode layer and second electrode layer) in a cylindrical configuration. This nested arrangement maximizes the use of available space and ensures that the dielectric layer is uniformly formed without excessive thinning, thereby maintaining reliability while achieving the desired capacitance.
2Quantity of substance
If high dielectric constant materials are used to enhance capacitance, then the capacitance increases, but the manufacturing process stability and reliability become difficult to ensure
Solution Approach 1:
The invention changes the structural parameters of the capacitor from a planar to a cylindrical configuration, and introduces a multi-layer electrode structure with specific thickness ratios. By adjusting these geometric parameters rather than relying on high dielectric constant materials, the invention achieves enhanced capacitance while maintaining compatibility with existing manufacturing processes and ensuring process stability.
3Quantity of substance
If the effective area of the capacitor is increased to enhance capacitance, then the capacitance increases, but the unit cell area constraint limits the extent of increase
Solution Approach 1:
The invention resolves the area constraint by utilizing the vertical dimension through a cylindrical capacitor structure with stacked electrode layers. This allows the effective area to be increased through vertical stacking rather than horizontal expansion, thereby enhancing capacitance within the confined unit cell area.
4Quantity of substance
If HSG is formed on a cylindrically shaped lower electrode to enhance capacitance, then the effective area increases by 10-30%, but the dielectric layer is not uniformly formed on the HSG surface
Solution Approach 1:
The invention applies different structural characteristics to different parts of the capacitor structure. The first electrode layer and second electrode layer are designed with different thicknesses and configurations, creating local quality variations that ensure uniform dielectric layer formation in critical areas while maximizing capacitance in other areas. This avoids the uniformity problems associated with HSG formation.
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 approach results in a semiconductor device with an enhanced effective area and capacitance, improving the reliability and stability of the capacitor while maintaining manufacturing process stability.
Implementation Method 1
using a micelle structure and surfactant self-assembly to control pore dimensions
Implementation Method 2
using a micelle structure and surfactant self-assembly to control pore dimensions
Data Source
AI summary
In a method of manufacturing a semiconductor device including a capacitor, a first mold layer is formed on a semiconductor substrate. The first mold layer is partially etched to form a first mold layer pattern including an opening for a capacitor. A first lower electrode layer is formed on the first mold layer pattern. A second lower electrode layer including a plurality of first pores is formed on the first lower electrode layer and in the opening. Upper portions of the first lower electrode layer and the second lower electrode layer are removed to form a first lower electrode and a second lower electrode in the opening. A dielectric layer and an upper electrode are successively formed on the first lower electrode and the second lower electrode. Therefore, a capacitor having an enhanced capacitance may be obtained.