Selective Metal Oxide Deposition Using Silane Inhibitor Layers
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Solution Overview
Problem
The challenge of edge placement errors and tiger tooth defects in semiconductor devices due to difficulties in patterning small structures with extreme ultraviolet lithography leads to increased RC delay and device performance issues, limiting downscaling in semiconductor manufacturing.
Innovation Solution
The use of a silicon-containing inhibitor to selectively inhibit certain regions on a semiconductor surface, allowing for controlled deposition of materials on non-inhibited areas, such as forming silicide bonds on metal surfaces and depositing dielectric layers to create spacing between metal vias and lines, thereby improving device performance and reducing RC delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If EUV lithography is used for patterning small structures, then device downscaling is enabled, but edge placement errors and tiger tooth defects increase
Solution Approach 1:
A silicon-containing inhibitor layer is introduced as an intermediary substance between the lithography process and the metal surfaces. This inhibitor selectively adsorbs to metal regions, creating a protective interface that prevents direct interaction between subsequent deposition materials and metal surfaces, thereby eliminating tiger tooth defects and improving edge placement accuracy
Solution Approach 2:
The inhibitor layer provides spatially selective protection by preferentially binding to metal surfaces while leaving dielectric surfaces unaffected. This local differentiation allows subsequent materials to deposit uniformly on dielectric regions without forming defects at metal-dielectric interfaces, resolving the edge placement error problem
2Manufacturing precision
If inhibitor layer is deposited on metal surfaces, then selective deposition on non-metal surfaces is enabled, but additional processing steps are required
Solution Approach 1:
The silicon-containing inhibitor exhibits self-selective behavior by automatically preferentially adsorbing to metal surfaces based on their chemical properties, without requiring external guidance or complex patterning steps. This self-service mechanism reduces processing complexity while maintaining high selective deposition control
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 enhances device performance by reducing edge placement errors and RC delay while maintaining stability and selectivity, and can reduce EUV lithography steps and production costs.
Implementation Method 1
The silicon-containing inhibitor can be used to form silicide bonds preferentially on certain surfaces, such as those having a metal or a semiconductor
Implementation Method 2
deposition of that material will occur on the exposed, non-inhibited surface
Data Source
AI summary
The present disclosure relates to methods and apparatuses for selective deposition on a surface. In particular, a silicon-containing inhibitor can be used to selectively bind to a first region, thus inhibiting deposition of a material on that first region.