Damascene Conductive Structure for Defect-Resistant Access Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor fabrication design rules scale to smaller dimensions, the formation of conductive structures such as access lines is prone to processing defects like necking, void formation, and line bending, which affect the electrical properties and performance of memory devices.
Innovation Solution
The use of a combination of a first conductive material, such as conductive metal nitride, and a second conductive material, such as conductive metal, where the second material is disposed on the surface of the first material, forming a damascene conductive structure that reduces processing defects and enhances electrical performance by mitigating electrical potential differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-material conductive structures (e.g., tungsten, molybdenum) are used, then manufacturing simplicity is maintained, but processing defects such as necking, void formation, and line bending occur
Solution Approach 1:
The patent applies composite materials by combining a first conductive material (e.g., tungsten, molybdenum) with a second conductive material (e.g., conductive metal nitride such as titanium nitride, tantalum nitride, or cobalt) to form a multi-layer conductive structure. This composite approach eliminates processing defects like necking, void formation, and line bending that occur with single-material structures, while maintaining manufacturing feasibility through established deposition techniques.
2Area of moving object
If conductive structures are formed at smaller dimensions per scaling requirements, then device density is improved, but processing defects such as necking and void formation increase
Solution Approach 1:
The multi-layer conductive structure with a first conductive material and a second conductive material (conductive metal nitride) provides superior formation characteristics at scaled dimensions. The composite structure prevents necking and void formation that typically occur when forming conductive structures at smaller dimensions, enabling higher device density without compromising manufacturing precision.
3Reliability
If individual conductive material deposition is used, then manufacturing process simplicity is maintained, but electrical potential differences cause performance degradation
Solution Approach 1:
The conductive metal nitride layer (second conductive material) is specifically designed to mitigate electrical potential differences between the first conductive material and adjacent structures. This composite material system improves electrical performance and reliability, with the nitride layer acting as an intermediate that balances electrical potentials, while the overall structure remains manufacturable through conventional multi-layer deposition processes.
Data Source
AI summary
Methods, apparatuses, and systems related to conductive structures are described. An example conductive structure includes a first conductive material including a conductive metal nitride, where the first conductive material has a thickness of at least 0.5 nanometers, and a second conductive material including a conductive metal, where the second conductive material is disposed on a first surface of the first conductive material.