Silicon Germanium Paste Composition for Safe Atmospheric Processing
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Solution Overview
Problem
Existing methods for forming silicon germanium layers require hazardous gases and lengthy vacuum processes, making them unsafe and inefficient.
Innovation Solution
A paste composition comprising aluminum and germanium, with a specific germanium content range, is applied to a silicon-containing substrate and sintered at controlled temperatures to form a silicon germanium layer without the need for hazardous gases or vacuum equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical vapor deposition or molecular beam epitaxy is used to form silicon germanium layer, then the layer can be formed with good quality, but hazardous gases such as SiH4 or GeH4 are required
Solution Approach 1:
The invention changes the chemical form of germanium from gaseous precursors (SiH4, GeH4) to solid germanium powder in a paste composition. This parameter change in the physical state and delivery method of germanium eliminates the need for hazardous gases while enabling safe, atmospheric-pressure processing that still produces high-quality silicon germanium layers through solid-state diffusion and reaction mechanisms.
2Manufacturing precision
If epitaxial growth or sputtering is used to form silicon germanium layer, then the layer can be formed with good quality, but a long processing time is required due to vacuum apparatus
Solution Approach 1:
The invention replaces the mechanical vacuum system required for epitaxial growth and sputtering with a simple atmospheric-pressure heating process. By substituting the complex vacuum apparatus with a straightforward thermal processing approach using paste composition, the method eliminates time-consuming vacuum pumping and chamber evacuation steps while maintaining layer quality through controlled solid-state reactions.
Solution Approach 2:
The invention utilizes phase transitions of the paste composition components during heating - the organic vehicle evaporates, the aluminum and germanium powders undergo solid-state diffusion and reaction to form aluminum germanium intermetallic compounds, which then react with silicon substrate to form silicon germanium layer. These controlled phase transitions enable rapid processing without vacuum requirements while achieving high-quality epitaxial-like layers.
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
The method allows for the safe and efficient formation of silicon germanium layers, reducing processing time and eliminating the use of hazardous gases, while achieving effective layer formation and reactivity.
Implementation Method 1
step 2 of sintering the substrate to which the paste composition is applied
Implementation Method 2
sintering is performed at a temperature of 500 to 1000° C.
Implementation Method 3
a paste composition for forming a silicon germanium layer, the composition comprising aluminum and germanium
Data Source
AI summary
This invention provides a paste composition that enables a silicon germanium layer to be formed safely and easily, and a method for forming a silicon germanium layer safely and easily. The present invention provides a paste composition for forming a silicon germanium layer, the composition comprising aluminum and germanium, wherein the content of the germanium is more than 1 part by mass and 10000 parts by mass or less, per 100 parts by mass of the aluminum.