Self-Assembled Monolayer Blocking for Selective Dielectric Deposition
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Solution Overview
Problem
The semiconductor industry faces challenges in achieving sufficient selectivity in selective film deposition processes, particularly in narrow spaces, which affects manufacturing complexity and yield in advanced semiconductor devices.
Innovation Solution
A method involving a spin-on process to form a self-assembled monolayer (SAM) on a recessed metal surface, which acts as a blocking layer to prevent dielectric film deposition in unwanted areas, using a spin-coating processing system to enhance selectivity and simplify manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional selective film deposition processes are used, then dielectric film can be deposited on dielectric material surface, but selectivity in narrow spaces is insufficient and manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by forming a self-assembled monolayer (SAM) on the metal surface before dielectric film deposition. This SAM layer is deposited in advance to selectively block metal surfaces, ensuring that subsequent dielectric films are deposited only on dielectric material surfaces, thereby achieving the desired selectivity before the main deposition process occurs.
Solution Approach 2:
The self-assembled monolayer (SAM) acts as an intermediary blocking layer between the metal surface and the dielectric film. This intermediary layer selectively prevents dielectric film deposition on metal surfaces while allowing deposition on dielectric material surfaces, thereby resolving the selectivity issue without increasing manufacturing complexity.
2Productivity
If selective film deposition is implemented without SAM blocking layer, then process steps are simpler, but selectivity and process margins are insufficient leading to lower yield
Solution Approach 1:
The SAM blocking layer is formed as a preliminary step before dielectric film deposition to ensure selective deposition. This advance preparation enables better process control and margins, directly improving yield by preventing unwanted dielectric film deposition on metal surfaces while adding only one process step.
Solution Approach 2:
The self-assembled monolayer forms through self-assembly of molecules on the metal surface, requiring minimal processing intervention. This self-service mechanism provides reliable selective blocking without complex process control, thereby improving yield while maintaining process simplicity.
3Manufacturing precision
If chemical mechanical planarization is performed with large overburden, then surface planarity is improved, but manufacturing complexity and process time increase
Solution Approach 1:
The SAM blocking layer is formed preliminarily to enable selective dielectric film deposition on dielectric material surfaces. This preliminary action allows for reduced overburden in subsequent chemical mechanical planarization steps, as the SAM layer provides sufficient surface definition without requiring excessive planarization to achieve the desired surface planarity, thereby reducing process time.
4Reliability
If larger starting stack heights are used, then process margins are improved, but device density and integration are reduced
Solution Approach 1:
The SAM blocking layer is formed in advance to provide reliable selective deposition control. This preliminary action enables the use of smaller starting stack heights while maintaining adequate process margins, because the SAM layer ensures precise selective deposition without requiring excessive material thickness to compensate for poor selectivity, thereby improving device density.
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 improves selectivity in narrow spaces, enabling better process margins and higher yield by reducing chemical mechanical planarization overburden and allowing smaller starting stack heights.
Implementation Method 1
selectively forming a self-assembled monolayer (SAM) on the recessed metal surface
Implementation Method 2
selectively forming a self-assembled monolayer (SAM) on the recessed metal surface using a spin-on process
Implementation Method 3
selectively forming a self-assembled monolayer (SAM) on the recessed metal surface using a spin-on process
Data Source
AI summary
A method of processing a substrate that includes: loading the substrate in a processing system, the substrate including a metal having a metal surface and a first dielectric material having a dielectric material surface, the metal surface and the dielectric material surface being at the same level; etching the metal to form a recessed metal surface below the dielectric material surface; selectively forming a self-assembled monolayer (SAM) on the recessed metal surface using a spin-on process; and depositing a dielectric film including a second dielectric material on the dielectric material surface.