Low-k Dielectric Protection Using a Nitrogen-Rich Capping Interface
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Solution Overview
Problem
Low-k or extreme low-k dielectric materials in integrated circuits are susceptible to damage during processing operations, leading to electrical failures and compromised quality, particularly during the formation of etch stop layers.
Innovation Solution
A nitrogen-rich protective layer is formed within the top portion of the low-k or extreme low-k dielectric layer using a nitrogen-based plasma process, followed by a capping layer deposition, to protect the dielectric material from subsequent processing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional processing operations are used to form etch stop layers, then manufacturing process simplicity is maintained, but the low-k dielectric material suffers damage leading to electrical failures
Solution Approach 1:
A nitrogen-rich protective layer is formed within the top portion of the low-k dielectric layer before subsequent processing operations. This preliminary protective measure prevents damage during etch stop layer formation and other processing steps, thereby improving dielectric integrity without requiring fundamental changes to the manufacturing process flow
Solution Approach 2:
The nitrogen-rich protective layer acts as an intermediary between the low-k dielectric material and the processing environment. This intermediate layer shields the sensitive dielectric from harmful effects of conventional processing operations, allowing standard manufacturing processes to continue while protecting the dielectric integrity
2Ease of manufacture
If the low-k dielectric is exposed to plasma processing, then etch stop layers can be formed, but the dielectric material becomes damaged
Solution Approach 1:
The patent utilizes nitrogen-based plasma processing to form the protective layer, converting the potentially harmful plasma exposure into a beneficial protective measure. The same plasma mechanism that could damage the dielectric is instead used to create a nitrogen-rich protective layer within the dielectric structure
Solution Approach 2:
The nitrogen-rich protective layer serves as an intermediary that allows subsequent plasma processing to proceed without directly exposing the low-k dielectric to harmful plasma conditions. This intermediate protection layer absorbs or mitigates the harmful effects of plasma exposure
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 nitrogen-rich protective layer effectively prevents damage to the low-k dielectric, maintaining its integrity and reducing the risk of electrical failures, while also enhancing device reliability and reducing fabrication costs.
Implementation Method 1
A nitrogen-rich protective layer is formed within the top portion of the low-k or extreme low-k dielectric layer using a nitrogen-based plasma process
Implementation Method 2
using a nitrogen-based plasma process, followed by a capping layer deposition
Data Source
AI summary
The present disclosure describes a method for forming a nitrogen-rich protective layer within a low-k layer of a metallization layer to prevent damage to the low-k layer from subsequent processing operations. The method includes forming, on a substrate, a metallization layer having conductive structures in a low-k dielectric. The method further includes forming a capping layer on the conductive structures, where forming the capping layer includes exposing the metallization layer to a first plasma process to form a nitrogen-rich protective layer below a top surface of the low-k dielectric, releasing a precursor on the metallization layer to cover top surfaces of the conductive structures with precursor molecules, and treating the precursor molecules with a second plasma process to dissociate the precursor molecules and form the capping layer. Additionally, the method includes forming an etch stop layer to cover the capping layer and top surfaces of the low-k dielectric.