Oxidizing Plasma Effluents for Semiconductor Deposition Defect Control
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Solution Overview
Problem
Current semiconductor processing methods are inadequate in controlling defect formation at small dimensions, leading to device performance issues due to residual defects on substrates and chamber surfaces, which are difficult to identify and remove.
Innovation Solution
The method involves forming a plasma of a carbon-containing precursor in a semiconductor processing chamber, depositing a carbon-containing material on a substrate, and contacting it with plasma effluents of an oxidizing material, such as oxygen or fluorine, to form volatile materials and reduce surface defects, while maintaining specific plasma power and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional deposition methods are used, then material layers can be formed on substrates, but defect formation increases at small dimensions
Solution Approach 1:
The patent applies preliminary action by performing a plasma treatment with oxidizing material effluents immediately after carbon-containing material deposition. This treatment is conducted before subsequent processing steps to prevent defect formation. The plasma treatment modifies the surface properties of deposited materials and removes residual carbon-containing deposits from chamber surfaces, thereby preventing defect formation in small-dimension devices while maintaining manufacturing precision.
2Manufacturing precision
If deposition parameters are controlled to reduce defects, then defect formation decreases, but process complexity increases
Solution Approach 1:
The patent uses plasma effluents of oxidizing material as an intermediary substance between the deposition process and subsequent processing. This intermediary plasma treatment simplifies the overall process by providing a single, effective step that addresses multiple issues: it modifies surface properties, removes residual deposits, and prevents defect formation. The plasma acts as a mediator that connects the deposition step with subsequent processing, reducing the need for multiple separate treatment steps and thereby reducing process complexity while maintaining manufacturing precision.
3Manufacturing precision
If chamber cleanings are performed to remove residual deposits, then surface quality improves, but production time increases
Solution Approach 1:
The patent implements continuity of useful action by performing the plasma treatment with oxidizing material effluents continuously within the deposition chamber without breaking the vacuum or stopping the production flow. The treatment is integrated into the deposition process sequence, allowing surface quality improvement to occur during what would otherwise be idle time between deposition and subsequent processing. This continuous action approach maintains surface quality while minimizing production time losses.
Solution Approach 2:
The plasma treatment with oxidizing material effluents enables the chamber surfaces to self-clean by forming volatile materials from residual carbon-containing deposits. The plasma reacts with the residual deposits to create volatile compounds that are automatically removed from the chamber, eliminating the need for separate manual cleaning operations. This self-service mechanism improves surface quality while maintaining production efficiency by avoiding additional cleaning steps that would increase production time.
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 effectively reduces defect formation on substrates, improves adhesion of subsequently deposited materials, and controls surface hydrophobicity or hydrophilicity, enhancing the quality of semiconductor structures and reducing inline defects.
Implementation Method 1
forming a plasma of a carbon-containing precursor in a processing region of a semiconductor processing chamber. The methods may include depositing a carbon-containing material on a substrate housed in the processing region
Implementation Method 2
contacting the carbon-containing material with plasma effluents of an oxidizing material. The methods may include forming volatile materials from a surface of the carbon-containing material
Implementation Method 3
Contacting the carbon-containing material with plasma effluents of the oxidizing material may cause a surface of the carbon-containing material to become negatively charged
Data Source
AI summary
Exemplary methods of semiconductor processing may include forming a plasma of a carbon-containing precursor in a processing region of a semiconductor processing chamber. The methods may include depositing a carbon-containing material on a substrate housed in the processing region of the semiconductor processing chamber. The methods may include halting a flow of the carbon-containing precursor into the processing region of the semiconductor processing chamber. The methods may include contacting the carbon-containing material with plasma effluents of an oxidizing material. The methods may include forming volatile materials from a surface of the carbon-containing material.