Semiconductor Contact Coating for Lower Parasitic Capacitance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing electrical contacts on semiconductor regions face challenges in adapting the cross-section or diameter of contacts without significant modifications to the manufacturing line, leading to difficulties in reducing parasitic capacitance and improving insulation.
Innovation Solution
A method involving the formation of a dielectric coating layer on the side walls of openings, followed by the deposition and planarization of a metal filler layer, allows for the reduction of the contact's effective diameter by adjusting the thickness of the coating layer, thereby adapting the contact's cross-section without altering the existing manufacturing line processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the opening cross-section is reduced to minimize parasitic capacitance, then the parasitic capacitance is reduced, but it becomes difficult to adapt the contact cross-section without significant modifications to the manufacturing line
Solution Approach 1:
The contact structure is segmented into multiple functional layers: a dielectric coating layer deposited on the opening walls and a metal filler layer filling the opening. This segmentation allows independent optimization of each layer - the dielectric layer thickness can be adjusted to control the effective contact cross-section without changing the opening dimensions, thus reducing parasitic capacitance while keeping the manufacturing process simple and adaptable
Solution Approach 2:
The effective cross-section of the contact is controlled by changing the thickness parameter of the dielectric coating layer rather than changing the opening cross-section. By adjusting the coating layer thickness, the parasitic capacitance can be minimized while using the same fixed opening dimensions and manufacturing parameters, avoiding the need to modify the manufacturing line
2Reliability
If the contact cross-section is reduced to enhance insulation, then the insulation is enhanced, but adapting the contact cross-section requires significant modifications to the manufacturing line
Solution Approach 1:
A dielectric coating layer is introduced as an intermediary between the opening structure and the metal filler. This intermediate layer serves as a tuning element that adjusts the effective contact cross-section and enhances insulation without requiring modifications to the opening fabrication process. The coating layer can be deposited using standard manufacturing techniques with adjustable thickness parameters
Solution Approach 2:
The contact structure becomes dynamically adjustable through the dielectric coating layer thickness parameter. By varying the coating thickness, the effective cross-section and insulation characteristics can be optimized for different applications without physically modifying the manufacturing line or opening dimensions, providing flexibility while maintaining ease of manufacture
3Object-generated harmful factors
If a dielectric coating layer is added to reduce contact cross-section, then the parasitic capacitance is minimized, but the device structure becomes more complex
Solution Approach 1:
The dielectric coating layer serves multiple functions simultaneously: it reduces the effective contact cross-section to minimize parasitic capacitance, provides additional insulation, and can serve as a diffusion barrier. By combining multiple functions into a single layer, the structure achieves complex performance goals without proportionally increasing structural complexity
Solution Approach 2:
The contact structure uses a composite configuration combining dielectric material (coating layer) and conductive material (filler layer). This composite structure allows the dielectric properties of the coating to reduce parasitic capacitance while the metal filler maintains electrical connectivity, achieving performance optimization without excessive structural complexity
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 reduces the effective cross-section of electrical contacts, minimizing parasitic capacitance, enhancing insulation, and enabling more efficient packing of contacts, while maintaining the existing manufacturing line efficiency and reducing costs.
Implementation Method 1
the deposition of a layer of dielectric material from the first surface of the dielectric region, at least on the side walls and at the bottom of the opening
Implementation Method 2
the etching is an anisotropic plasma etching, suitable for etching the layer of dielectric material preferentially along the longitudinal direction
Implementation Method 3
the deposition of a metal layer from the first surface of the dielectric region
Implementation Method 4
the removal includes a planarization, for example a chemical mechanical polishing
Data Source
AI summary
The present disclosure relates to a method for manufacturing a contact on a semiconductor region of an electronic component. The method includes forming a coating layer of dielectric material, with a thickness, on at least one side wall of an opening crossing through a dielectric region of the electronic component along a longitudinal direction from a first surface of the dielectric region, and opening out at the semiconductor region. The method includes forming of a metal filler layer, so as to fill the opening coated with the coatin