Semiconductor Surface Modification via Dopant Fluid Layer
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Solution Overview
Problem
Current semiconductor surface modification techniques using short-pulse laser radiation require vacuum evacuation, leading to inefficiencies such as dopant fluid consumption, contamination, beam path interference, and manufacturing complexities.
Innovation Solution
A method and system for doping semiconductor materials using a dopant fluid layer adjacent to the target region, where laser radiation is applied through the dopant fluid layer, and the dopant fluid is actively replenished, eliminating the need for a vacuum and reducing contamination, with optional use of a barrier fluid layer to further exclude air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum evacuation is used for semiconductor surface modification, then the process environment is controlled, but dopant fluid consumption increases and manufacturing complexity increases
Solution Approach 1:
The patent replaces vacuum evacuation with an inert atmosphere environment. The processing chamber is filled with an inert gas atmosphere that prevents unwanted chemical reactions while allowing the laser processing and dopant delivery to proceed without requiring vacuum conditions. This eliminates the dopant fluid consumption associated with vacuum systems while maintaining reliable process environment control.
2Reliability
If vacuum evacuation is used for semiconductor surface modification, then the process environment is controlled, but manufacturing complexity increases
Solution Approach 1:
The patent eliminates vacuum evacuation systems and replaces them with a simpler inert atmosphere delivery system. The processing chamber is equipped with gas inlet and outlet ports that allow inert gas to flow through the chamber, creating a controlled atmosphere without the complexity of vacuum pumps, seals, and pressure control systems required for vacuum-based processing.
3Manufacturing precision
If dopant fluid is used in vacuum environment, then surface modification is achieved, but contamination by process by-products occurs
Solution Approach 1:
The patent uses an inert atmosphere to prevent unwanted chemical reactions and contamination during the surface modification process. The inert gas environment prevents oxidation and other reactive processes that would create contaminant by-products, while still allowing the laser-induced surface modification and dopant incorporation to proceed effectively.
Solution Approach 2:
The patent replaces the mechanical vacuum system with a fluid-based inert atmosphere system. Instead of removing all gases from the chamber, the system introduces a controlled inert gas atmosphere that achieves the same protective effect against contamination but without the complexity and associated contamination risks of vacuum systems.
4Manufacturing precision
If short-pulse laser radiation is used for doping, then surface modification is achieved, but beam path interference occurs
Solution Approach 1:
The inert atmosphere created by the gas flow system provides a transparent medium for the laser beam path. Unlike vacuum systems that may have outgassing interference or other atmospheric conditions that could scatter or absorb laser radiation, the controlled inert gas atmosphere maintains optimal optical properties for short-pulse laser transmission while protecting against contamination.
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 enhances the efficiency and reliability of semiconductor surface modification by maintaining dopant concentration, reducing contamination, and allowing for uniform or graded surface modification without the need for vacuum processing, resulting in improved semiconductor material performance.
Implementation Method 1
lasing (providing laser radiation to) the target region of the semiconductor material through the dopant fluid layer
Implementation Method 2
lasing (providing laser radiation to) the target region of the semiconductor material through the dopant fluid layer to incorporate the dopant into the target region of the semiconductor material
Data Source
AI summary
Methods, systems, and devices associated with surface modifying a semiconductor material are taught. One such method includes providing a semiconductor material having a target region and providing a dopant fluid layer that is adjacent to the target region of the semiconductor material, where the dopant fluid layer includes at least one dopant. The target region of the semiconductor material is lased so as to incorporate the dopant or to surface modify the semiconductor material. During the surface modification, the dopant in the dopant fluid layer is actively replenished.