UV-Resistant Dielectric Diffusion Barrier Formation
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Solution Overview
Problem
Current methods for forming dielectric diffusion barrier layers in integrated circuit fabrication face challenges in maintaining stability, mechanical strength, and resistance to ultraviolet (UV) radiation, which can lead to adhesion issues and reliability problems due to stress shifts and hydrogen content.
Innovation Solution
The formation of UV-resistant dielectric diffusion barrier films is achieved by depositing layers in a hydrogen-starved environment and treating them with thermal, plasma, or UV processes to reduce hydrogen content and minimize stress shifts, using techniques such as ion bombardment and thermal annealing to create films with lower modulus and improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diffusion barrier layer is made more resistant to UV radiation by thermal, plasma, or UV treatment, then UV resistance is improved, but the modulus of the layer increases which can lead to stress shifts and adhesion problems
Solution Approach 1:
The patent applies parameter changes by modifying the deposition conditions (hydrogen-starved environment) and post-deposition treatments (thermal, plasma, or UV treatment) to alter the physical and chemical properties of the diffusion barrier layer. These parameter changes reduce hydrogen content and adjust the modulus to an optimal range that provides UV resistance while maintaining adhesion and minimizing stress shifts.
Solution Approach 2:
The patent employs composite materials by combining the diffusion barrier layer with overlying dielectric layers to create a multi-layer structure. The diffusion barrier layer is engineered with specific composition (reduced hydrogen content) and properties (adjusted modulus) that work in conjunction with the dielectric layers to achieve overall UV resistance while maintaining mechanical integrity and adhesion throughout the film stack.
2Reliability
If the diffusion barrier layer is deposited in a hydrogen-starved environment to reduce hydrogen content, then UV resistance is improved, but the mechanical strength and adhesion may be compromised
Solution Approach 1:
The patent uses parameter changes by controlling the deposition environment (hydrogen-starved conditions) and applying post-deposition treatments (thermal, plasma, or UV) to achieve the optimal balance. These parameter adjustments reduce hydrogen content to improve UV resistance while simultaneously optimizing other deposition parameters and treatment conditions to maintain or enhance adhesion and mechanical strength.
Solution Approach 2:
The patent applies preliminary action by depositing the diffusion barrier layer with reduced hydrogen content from the beginning (hydrogen-starved environment) rather than attempting to remove hydrogen after deposition. This preliminary reduction in hydrogen content during deposition prevents excessive modulus increase and stress shifts that would occur with aggressive post-deposition hydrogen removal, thereby maintaining adhesion while achieving UV resistance.
3Reliability
If the modulus of the diffusion barrier layer is lowered to improve UV resistance, then adhesion is improved, but mechanical strength may be reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the modulus of the diffusion barrier layer through deposition condition optimization (hydrogen-starved environment) and post-deposition treatments (thermal, plasma, or UV). The modulus is adjusted to a specific optimal range that provides sufficient UV resistance and adhesion while maintaining adequate mechanical strength. This involves balancing multiple parameters including hydrogen content, film density, and treatment temperature/duration.
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
The approach results in diffusion barrier layers that are more resistant to UV radiation, maintaining stability and adhesion properties, thereby enhancing the integrity of the film stack and reducing the likelihood of delamination and device failure.
Implementation Method 1
Diffusion barrier layers can be made more resistant to UV radiation by thermal, plasma, or UV treatment during or after deposition
Implementation Method 2
Diffusion barrier layers can be made more resistant to UV radiation by thermal, plasma, or UV treatment during or after deposition
Implementation Method 3
Diffusion barrier layers can be made more resistant to UV radiation by thermal, plasma, or UV treatment during or after deposition
Implementation Method 4
Lowering the modulus of the diffusion barrier layer can also improve the resistance to UV radiation
Implementation Method 5
UV-resistant diffusion barrier layers are formed by depositing the layer in a hydrogen-starved environment
Implementation Method 6
thermal annealing to create films with lower modulus and improved adhesion
Data Source
AI summary
Stability of an underlying dielectric diffusion barrier during deposition and ultraviolet (UV) processing of an overlying dielectric layer is critical for successful integration. UV-resistant diffusion barrier layers are formed by depositing the layer in a hydrogen-starved environment. Diffusion barrier layers can be made more resistant to UV radiation by thermal, plasma, or UV treatment during or after deposition. Lowering the modulus of the diffusion barrier layer can also improve the resistance to UV radiation.