Al Electrode Interlayer Film for Semiconductor Reliability
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Solution Overview
Problem
The chemical reaction between aluminum (Al) electrodes and silicon (Si) in semi-insulating films during the manufacturing of semiconductor devices leads to increased contact resistance, poor appearance, reduced resistance between isolated Al lines, and degraded reliability due to heat-generated reactions.
Innovation Solution
Forming interlayer films of materials like TiN, AlSi, or aluminum oxide between the Al electrodes and the semi-insulating film to prevent chemical reactions, ensuring the Al electrodes are not in direct contact with the Si-containing semi-insulating film, thereby maintaining the dielectric strength and stability of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semi-insulating film is formed directly over Al electrodes to stabilize potentials and enhance dielectric strength, then the device reliability and dielectric strength are improved, but chemical reactions occur between Al and Si during heat treatment causing increased contact resistance and degraded reliability
Solution Approach 1:
A barrier film is introduced as an intermediary layer between the Al electrode and the semi-insulating film. This barrier film prevents direct contact and chemical reaction between Al and Si during heat treatment, while still allowing the semi-insulating film to provide its intended functions of potential stabilization and dielectric strength enhancement.
Solution Approach 2:
The interface between Al electrode and semi-insulating film is segmented by introducing a separate barrier film layer. This segmentation prevents the harmful chemical interaction while maintaining the beneficial electrical isolation and mechanical structure of the original configuration.
2Ease of manufacture
If Al electrodes are in direct contact with semi-insulating film containing Si, then the manufacturing process is simplified, but contact resistance increases due to chemical reactions during heating
Solution Approach 1:
The barrier film serves as a mediator that prevents chemical reactions between Al and Si during manufacturing processes involving heat. This additional layer, while adding a step to the manufacturing process, ensures low and stable contact resistance by preventing the formation of high-resistance reaction products.
3Stability of the object's composition
If semi-insulating film is formed over Al electrodes to stabilize potentials, then potential stabilization is achieved, but the appearance deteriorates due to chemical reactions
Solution Approach 1:
The barrier film acts as a protective intermediary that prevents chemical reactions between Al and Si, thereby maintaining the visual appearance of the device. The semi-insulating film can still be formed over the barrier film to provide potential stabilization without the appearance degradation caused by direct Al-Si reactions.
4Strength
If Al electrodes contact semi-insulating film during heat treatment, then the dielectric strength is enhanced, but resistance between isolated Al lines reduces causing potential shorting
Solution Approach 1:
The barrier film serves as a protective intermediary that prevents chemical reactions between Al and Si, thereby maintaining the visual appearance of the device. The semi-insulating film can still be formed over the barrier film to provide potential stabilization without the appearance degradation caused by direct Al-Si reactions.
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
Prevents chemical reactions between Al electrodes and the semi-insulating film, reducing contact resistance and enhancing the reliability and dielectric strength of the semiconductor device while allowing the semi-insulating film to maintain its intended effect of stabilizing potentials and increasing dielectric strength.
Implementation Method 1
the Al electrodes may chemically react with Si contained in the semi-insulating film due to the heat generated when forming the semi-insulating film or due to the heating of the semiconductor substrate at a subsequent step
Data Source
AI summary
A method for manufacturing a semiconductor device includes the steps of forming a P-type region on a surface of a semiconductor substrate, forming at least one Al electrode on the P-type region, forming an interlayer film in contact with the at least one Al electrode, the interlayer film being of a material which is less reactive with Si than is Al, and forming a semi-insulating film on the interlayer film, the semi-insulating film containing Si.