Epitaxial Silicon Wafer Doping for Precise Net Conductivity
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Solution Overview
Problem
Existing methods for producing silicon wafers struggle with accurately defining electrically active net doping, often resulting in undesired side effects and requiring costly, complex processes due to variations in dopant segregation coefficients, leading to inaccuracies in electrical conductivity.
Innovation Solution
The method involves epitaxially growing a silicon layer on a carrier substrate with both p-type and n-type dopants introduced at concentrations greater than 1×10^13 cm^-3, allowing for precise control of electrically active net doping, enabling the production of high-quality silicon wafers with predefined doping profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional ingot production methods are used to produce silicon wafers, then the production process is established and relatively simple, but the electrically active net doping cannot be predefined with high accuracy due to different segregation coefficients of individual dopants leading to undesired variation in net doping concentration
Solution Approach 1:
The invention changes the fundamental parameter approach by introducing both p-type and n-type dopants simultaneously during epitaxial growth, rather than relying on single dopant segregation control. This parameter change enables precise control of net doping by compensating opposite dopant types, achieving high definition accuracy without complex post-processing
Solution Approach 2:
The invention uses oppositely polar dopant atoms as intermediaries that compensate each other's effects. By introducing both p-type and n-type dopants in controlled amounts, the net doping concentration can be precisely defined through this intermediary compensation mechanism, avoiding the segregation issues of traditional single-dopant methods
2Manufacturing precision
If complex methods are employed to prevent doping substances from being contained in the production method, then the electrically active net doping can be controlled more accurately, but the production process becomes cost-intensive
Solution Approach 1:
The invention enables the system to self-regulate doping concentrations through the inherent compensation mechanism of opposite dopant types. The epitaxial growth process automatically balances p-type and n-type dopant incorporation, eliminating the need for complex external control methods and reducing production costs while maintaining high precision
Solution Approach 2:
By changing to simultaneous dual-dopant introduction during epitaxial growth, the invention achieves accurate net doping control through a more economical process. This parameter change eliminates the need for costly complex prevention methods while maintaining or improving doping accuracy
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 allows for cost-effective production of silicon wafers with precise control over electrically active net doping, reducing material and process complexity, and enabling the creation of high-resistance wafers suitable for large-area electronic components like solar cells with improved charge carrier properties.
Implementation Method 1
The silicon layer is epitaxially grown on the carrier substrate
Data Source
AI summary
A silicon wafer for an electronic component, having an epitaxially grown silicon layer on a carrier substrate and the silicon layer is removed as a silicon wafer from the carrier substrate, in which at least one p-dopant and at least one n-dopant are introduced into the silicon layer during the epitaxial growth. The dopants are introduced into the silicon layer such that the silicon layer is formed having an electrically active p-doping and an electrically active n-doping, each greater than 1×1014 cm−3.