3D Fin Capacitor Structure for High-Density Semiconductor Fabrication
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Solution Overview
Problem
Existing capacitors for 3D semiconductor devices are not entirely satisfactory in terms of performance and manufacturing complexity, particularly in nanometer technology process nodes, where there is a need for improved fabrication methods to enhance device density and reduce costs.
Innovation Solution
A method for fabricating a 3D capacitor involving the formation of a fin structure on a substrate, followed by the deposition of insulation and dielectric layers, and the creation of distinct electrodes, utilizing techniques such as chemical vapor deposition and etching processes to achieve a high-k dielectric layer and low-resistance surface, allowing for efficient integration in 3D devices like FinFETs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing capacitor fabrication methods are used for 3D devices, then manufacturing process is simpler, but device performance and density are insufficient
Solution Approach 1:
The fabrication process is divided into distinct sequential stages: forming fin structures, depositing insulation material, removing insulation to expose fins, forming dielectric layers, and creating electrodes. This segmentation allows each step to be optimized independently while achieving high device density through the 3D fin structure architecture.
Solution Approach 2:
The invention transitions from planar capacitor structures to three-dimensional fin structures, utilizing vertical dimensionality to increase device density. The fin structures extend vertically from the substrate, allowing capacitors to be formed in multiple layers and increasing the effective capacitance area without proportionally increasing chip area.
2Productivity
If geometry size is scaled down to increase functional density, then production efficiency increases and costs decrease, but processing complexity increases
Solution Approach 1:
Insulation material is deposited over the fin structures before the fins are exposed, and then selectively removed. This preliminary deposition protects the fins during subsequent processing steps and establishes a defined sequence of operations that simplifies the overall fabrication process despite the reduced geometry sizes.
Solution Approach 2:
The insulation material serves as an intermediary layer that facilitates the fabrication process. It is deposited to cover the fins, then selectively removed to expose the fins for electrode formation. This intermediary step enables precise control over where electrodes are formed and simplifies the patterning process for small geometry features.
3Reliability
If high-k dielectric layers and low-resistance surfaces are formed to improve performance, then capacitor efficiency increases, but manufacturing complexity increases
Solution Approach 1:
The invention employs parameter changes in the form of high-k dielectric materials with higher permittivity values than conventional dielectrics. This material parameter change increases capacitor performance and density without requiring proportional increases in physical size. The low-resistance surface is achieved through doping or surface treatment parameter changes that reduce contact resistance.
Solution Approach 2:
The capacitor structure utilizes composite materials including high-k dielectric layers combined with conductive electrode materials, and insulation materials with specific dielectric properties. These composite material choices optimize both performance and fabrication compatibility, allowing the complex requirements for high performance to be met through material selection rather than overly complex processing.
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 enables the fabrication of efficient 3D capacitors suitable for high-density semiconductor devices, improving performance and reducing manufacturing complexity, thereby addressing the challenges of scaling down in the semiconductor industry.
Implementation Method 1
utilizing techniques such as chemical vapor deposition and etching processes to achieve a high-k dielectric layer
Implementation Method 2
followed by the deposition of insulation and dielectric layers
Implementation Method 3
utilizing techniques such as chemical vapor deposition and etching processes
Data Source
AI summary
A device includes a substrate including a low-resistance top surface and a fin structure including a first fin and a second fin. Each of the first and second fins includes a low-resistance fin-top surface and two low-resistance sidewall surfaces. The device includes an insulation material over the top surface of the substrate and between the first fin and the second fin. The fin-top surface and a first portion of the sidewall surfaces of each of the first and the second fins are above the insulation material. The device further includes a dielectric layer over the insulation material and in direct contact with the fin-top surface and the first portion of the sidewall surfaces of each of the first and the second fins; a first electrode in direct contact with the fin-top surface of the first fin; and a second electrode over the dielectric layer that is over the second fin.