Deuterium-Enriched Interlayer Insulating Film for Leakage Reduction
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Solution Overview
Problem
As semiconductor devices continue to downscale, there is a demand for high-integration and low-power semiconductor chips, but existing fabrication methods face challenges in enhancing the reliability and material characteristics of dielectric films, particularly in reducing leakage and improving film properties.
Innovation Solution
A method for fabricating semiconductor devices involves forming interlayer insulating films using chemical vapor deposition with a gas mixture containing deuterium and hydrogen, which enhances the reliability and characteristics of the dielectric films wrapping metal wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fabrication methods are used to form interlayer insulating films, then manufacturing process is simple, but film reliability and material characteristics deteriorate with leakage issues
Solution Approach 1:
The patent changes the chemical composition parameters of the deposition gas by introducing deuterium-containing gases (such as D2, SiD4, or OD3) mixed with hydrogen-containing gases (such as H2 or SiH4) during chemical vapor deposition. This parameter change in gas composition results in improved dielectric film properties including reduced leakage current and enhanced material characteristics, while maintaining a relatively straightforward fabrication process flow.
Solution Approach 2:
The patent employs composite gas mixtures containing both hydrogen and deuterium during the chemical vapor deposition process. This composite approach, where deuterium and hydrogen gases are combined in specific ratios (deuterium content typically between 1-50% of total gas flow), produces dielectric films with superior reliability and reduced leakage compared to conventional single-gas deposition methods.
2Reliability
If deuterium-containing gas is used in CVD to improve dielectric film characteristics, then film reliability improves, but manufacturing cost increases
Solution Approach 1:
The patent optimizes the deuterium gas concentration parameter to balance performance and cost. By controlling deuterium content in the gas mixture to be between 1-50% of total gas flow (with preferred ranges of 5-20%), the process achieves significant improvement in film reliability while avoiding excessive cost increase. This parameter optimization allows standard CVD equipment to be used with minimal modification.
Solution Approach 2:
The patent applies deuterium enrichment locally to only the interlayer insulating films that require enhanced reliability, rather than treating all films uniformly. This selective application focuses the cost benefit on critical dielectric layers where leakage reduction provides the most value, while other less critical films can be deposited using conventional methods.
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 improves the reliability and material characteristics of dielectric films, addressing leakage issues and enhancing the operational characteristics of semiconductor devices by forming interlayer insulating films through CVD with deuterium and hydrogen.
Implementation Method 1
the third interlayer insulating film contains deuterium and is formed through chemical vapor deposition using a first gas containing deuterium and a second gas containing hydrogen
Data Source
AI summary
A method for fabricating a semiconductor device includes forming a first wiring layer, the first wiring layer including a first metal wiring and a first interlayer insulating film wrapping the first metal wiring on a substrate, forming a first via layer, the first via layer including a first via that is in electrical connection with the first metal wiring, and a second interlayer insulating film wrapping the first via on the first wiring layer, and forming a second wiring layer, the second wiring layer including a second metal wiring that is in electrical connection with the first via, and a third interlayer insulating film wrapping the second metal wiring on the first via layer, wherein the third interlayer insulating film contains deuterium and is formed through chemical vapor deposition using a first gas containing deuterium and a second gas containing hydrogen.