Low-κ Layer Capping in Semiconductor Structure Formation
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Solution Overview
Problem
The deposition of a liner layer during the manufacturing of semiconductor devices can damage low-κ layers due to oxidation, leading to performance degradation and reduced yield in structures like TSVs and DTCs.
Innovation Solution
A capping layer, such as silicon nitride or silicon carbonitride, is introduced between the liner layer and the low-κ layers to prevent direct deposition of the liner layer on exposed surfaces of the low-κ layers, thereby preventing oxidation and maintaining the integrity of the low-κ layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a liner layer is deposited directly on low-κ layers, then the structure formation process is simplified, but the low-κ layers are damaged due to oxidation
Solution Approach 1:
A capping layer is introduced as an intermediary between the liner layer and the low-κ layers. This capping layer prevents direct contact between the liner layer deposition process and the low-κ layers, thereby preventing oxidation damage while still enabling the structure formation process to proceed.
Solution Approach 2:
The capping layer is deposited on the low-κ layers before the liner layer deposition process begins. This preliminary action protects the low-κ layers in advance from the harmful oxidation that would occur during subsequent liner layer deposition, allowing the process to proceed without damage.
2Reliability
If a capping layer is introduced between the liner layer and low-κ layers, then the low-κ layers are protected from oxidation, but the manufacturing process becomes more complex
Solution Approach 1:
The capping layer serves as a protective intermediary that can be deposited using standard semiconductor fabrication techniques. While it adds a process step, the materials and methods used are consistent with existing manufacturing capabilities, making the added complexity manageable and justified by the protection it provides.
3Productivity
If the liner layer is deposited directly on low-κ layers, then the manufacturing process is faster, but oxidation damage occurs leading to reduced yield
Solution Approach 1:
The capping layer is deposited as a preliminary protective step before the liner layer deposition. This preliminary action adds minimal time to the process while preventing oxidation damage that would otherwise occur, thereby maintaining manufacturing speed while improving device yield.
Solution Approach 2:
The capping layer acts as a protective mediator during the liner layer deposition process, allowing the manufacturing to proceed at normal speed without the need for additional protective measures that would slow down production, thus maintaining productivity while preventing yield loss.
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 capping layer effectively prevents damage to the low-κ layers during the deposition of the liner layer, enhancing the performance and yield of semiconductor devices by avoiding oxidation-related issues.
Implementation Method 1
The deposition of a liner layer during the manufacturing of semiconductor devices can damage low-κ layers due to oxidation
Implementation Method 2
A capping layer, such as silicon nitride or silicon carbonitride, is introduced between the liner layer and the low-κ layers to prevent direct deposition of the liner layer on exposed surfaces
Data Source
AI summary
A semiconductor device may include one or more low dielectric constant (low-κ) layers on a substrate. The semiconductor device may include a dielectric layer on the one or more low-κ layers. The semiconductor device may include a structure through the substrate, the one or more low-κ layers, and the dielectric layer. The semiconductor device may include a liner layer between the structure and the substrate, between the structure and the one or more low-κ layers, and between the structure and the dielectric layer. The semiconductor device may include a capping layer between the liner layer and the dielectric layer and between the liner layer and the one or more low-κ layers.