Copper Catalyst Synthesis of Silicon Wires
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Solution Overview
Problem
The existing methods for synthesizing silicon wires using metallic catalysts, such as gold, are limited by high costs and environmental concerns due to the formation of pollutants, and the introduction of cheaper metals like iron and nickel is hindered by high synthesis temperatures and potential impurities.
Innovation Solution
The method employs copper as a catalyst, forming a Cu catalyst layer on a substrate using physical or chemical vapor deposition, followed by annealing and reduction to create nano-scaled silicon wires at lower temperatures, reducing costs and minimizing impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gold is used as a catalyst for synthesizing silicon wires, then the synthesis can proceed effectively, but the cost increases significantly and environmental pollutants are formed
Solution Approach 1:
The patent replaces expensive gold catalysts with cheaper metals such as iron, nickel, or copper that can be disposed of after use. These cheaper metals perform the catalytic function effectively but do not require the same level of environmental control or cost investment as gold, directly addressing the contradiction between synthesis effectiveness and manufacturing cost.
Solution Approach 2:
The patent changes the chemical parameter of the catalyst from gold to cheaper alternative metals (Fe, Ni, Cu). This parameter change maintains the catalytic functionality while significantly reducing cost and environmental impact, resolving the contradiction between reliability and ease of manufacture.
2Ease of manufacture
If cheaper metals like iron or nickel are used as catalysts, then the cost decreases, but high synthesis temperatures are required which increases fabrication cost
Solution Approach 1:
The patent changes the catalyst material parameter from gold to cheaper metals and simultaneously optimizes the temperature parameter. By using specific cheaper metals and adjusting their particle sizes and distribution, the patent achieves effective catalysis at lower temperatures than traditionally required, resolving the contradiction between catalyst cost and synthesis temperature.
3Ease of manufacture
If iron or nickel catalysts are used, then the cost is reduced, but unwanted impurities are introduced into semiconductor elements
Solution Approach 1:
The patent applies local quality by using a composite catalyst system where different metals serve different functions. For example, copper is used in specific locations or combinations to provide catalytic activity while minimizing impurity introduction. This localized optimization resolves the contradiction between cost reduction and purity maintenance.
Solution Approach 2:
The patent employs composite catalyst materials combining multiple metals (e.g., Cu-Fe, Cu-Ni) where each component contributes different properties. The composite structure provides effective catalysis at lower costs while the specific composition is chosen to minimize unwanted impurities in the semiconductor, resolving the contradiction between catalyst cost and manufacturing precision.
4Productivity
If high synthesis temperatures are used with iron or nickel catalysts, then the synthesis proceeds, but the fabrication cost increases
Solution Approach 1:
The patent changes the catalyst material parameter to metals with lower melting points and better low-temperature activity (such as copper). This parameter change enables the synthesis to proceed at lower temperatures while maintaining acceptable productivity, thereby reducing energy consumption and fabrication cost without sacrificing too much synthesis rate.
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 lowers synthesis costs, reduces environmental impact, and maintains semiconductor performance by using copper, a cost-effective and compatible catalyst that does not degrade semiconductor elements.
Implementation Method 1
a Cu catalyst particle layer is formed on a top surface of the substrate... employing copper, Cu, as a catalyst
Implementation Method 2
forming a Cu catalyst layer on a substrate using physical or chemical vapor deposition
Implementation Method 3
forming a Cu catalyst layer on a substrate using physical or chemical vapor deposition
Implementation Method 4
followed by annealing and reduction to create nano-scaled silicon wires
Data Source
AI summary
A method of synthesizing silicon wires is provided. A substrate is provided. A copper catalyst particle layer is formed on a top surface of the substrate. The reactive device is heated at a temperature of above 450° C. in a flowing protective gas. A mixture of a protective gas and a silicon-based reactive gas is introduced at a temperature above 450° C. at a pressure below 700 Torr to form the silicon wires on the substrate.