Abrupt SiC-SiO Interface Formation to Reduce Trap States
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Solution Overview
Problem
Conventional methods for forming a layer of silicon-and-oxygen-containing material over a layer of silicon-and-carbon-containing material often result in the formation of silicon-oxygen-and-carbon-containing material at the interface, which degrades device performance by creating trap states that limit electron mobility.
Innovation Solution
The method involves performing a pre-treatment on a substrate to remove native oxide or residue, followed by depositing a layer of silicon-containing material and then oxidizing it to form a layer of silicon-and-oxygen-containing material, thereby avoiding the formation of silicon-oxygen-and-carbon-containing material at the interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to form silicon-and-oxygen-containing material over silicon-and-carbon-containing material, then the material layer is formed, but silicon-oxygen-and-carbon-containing material is formed at the interface which creates trap states and limits electron mobility
Solution Approach 1:
The patent applies preliminary action by performing a pre-treatment step before depositing the silicon-containing material. This pre-treatment removes native oxide and residue from the surface of the silicon-and-carbon-containing material layer, creating a clean interface that prevents the formation of silicon-oxygen-and-carbon-containing material during subsequent oxidation. By preparing the surface in advance, the patent eliminates the source of trap states before they can form.
Solution Approach 2:
The patent segments the formation process into distinct stages: (1) pre-treatment to remove native oxide and residue, (2) deposition of silicon-containing material, and (3) oxidation to form silicon-and-oxygen-containing material. This segmentation allows each step to be optimized independently, ensuring that the interface remains free of harmful silicon-oxygen-and-carbon-containing material while achieving the desired material properties.
2Manufacturing precision
If plasma-enhanced deposition is used to form films, then films with certain characteristics are produced, but additional processing is required to adjust or enhance material characteristics
Solution Approach 1:
The patent merges the deposition and oxidation steps into a coordinated sequence within the same processing chamber. The silicon-containing material is deposited via plasma-enhanced chemical vapor deposition (PECVD), and then oxidation is performed in the same chamber without removing the substrate. This merging reduces device complexity by eliminating transfer steps while maintaining precise control over film characteristics through parameter optimization.
Solution Approach 2:
The patent utilizes parameter changes to achieve the desired material characteristics. By adjusting plasma power, temperature, and precursor flow rates during deposition and oxidation, the patent optimizes the film properties directly during the deposition process. This reduces the need for additional post-processing steps to adjust material characteristics.
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 reduces or prevents the formation of silicon-oxygen-and-carbon-containing material at the interface, minimizing the density of trap states and enhancing electron mobility in transistor applications.
Implementation Method 1
The pre-treatment may include annealing the substrate in an oxygen-free environment. The annealing may be performed at a temperature greater than or about 500° C.
Implementation Method 2
Depositing the layer of silicon-containing material may be or include a physical vapor deposition (PVD), a chemical vapor deposition (CVD), or an evaporation deposition.
Implementation Method 3
Depositing the layer of silicon-containing material may be or include a physical vapor deposition (PVD), a chemical vapor deposition (CVD), or an evaporation deposition.
Implementation Method 4
The contacting may oxidize the layer of silicon-containing material to form a layer of silicon-and-oxygen-containing material.
Data Source
AI summary
Exemplary semiconductor processing methods may include performing a pre-treatment on a substrate housed within a processing region of a semiconductor processing chamber. The substrate may include a layer of silicon-and-carbon-containing material. The pre-treatment may remove native oxide or residue from a surface of the layer of silicon-and-carbon-containing material. The methods may include providing a silicon-containing precursor to the processing region of the semiconductor processing chamber. The methods may include contacting the substrate with the silicon-containing precursor. The contacting may deposit a layer of silicon-containing material on the layer of silicon-and-carbon-containing material. The methods may include providing an oxygen-containing precursor to the processing region of the semiconductor processing chamber. The methods may include contacting the substrate with the oxygen-containing precursor. The contacting may oxidize the layer of silicon-containing material to form a layer of silicon-and-oxygen-containing material.