Solid Ion Source Composition for Stable High-Current Implantation
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Solution Overview
Problem
Existing ion implantation methods face instability and reduced productivity due to the liquefaction and clogging of solid source materials during heating, leading to unstable vapor generation and ion beam current limitations.
Innovation Solution
A solid source material comprising a first material with a lower melting point, sublimation point, or decomposition point than the operating temperature, combined with a second material having a higher melting point, sublimation point, or decomposition point, is used to stabilize vapor generation and increase ion production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a solid source material with low melting point is heated to generate vapor, then vapor generation efficiency is improved, but the material liquefies and clogs the vapor introduction pipe
Solution Approach 1:
A wick material is introduced as an intermediary between the heating unit and the solid source material. The wick absorbs and transports the vapor from the heating unit to the vapor introduction pipe, preventing direct contact between the liquefied source material and the pipe, thus avoiding clogging while maintaining efficient vapor generation
Solution Approach 2:
The invention uses a wick that has already been tested and proven to effectively transport vapor without clogging. By replicating the successful vapor transport mechanism of the wick, the system achieves reliable vapor delivery without directly heating the source material to problematic temperatures
2Quantity of substance
If heating temperature is increased to enhance ion beam current, then ion production increases, but source material liquefaction and clogging worsen
Solution Approach 1:
The wick acts as a mediator that decouples the heating temperature from the vapor delivery effectiveness. High temperatures can be applied to the heating unit without directly affecting the source material in the vapor introduction pipe, as the wick controls the vapor transport process and prevents liquid material from reaching the pipe
Solution Approach 2:
The invention changes the operational parameters by separating the heating temperature parameter from the vapor delivery parameter. The heating unit can operate at high temperatures to generate sufficient vapor pressure, while the wick's capillary action and transport mechanism ensure controlled vapor delivery without liquid clogging
3Reliability
If solid source material is heated below melting point to prevent clogging, then system stability is improved, but vapor generation and ion production are insufficient
Solution Approach 1:
The wick material serves as an intermediary that enables the system to operate in a stable temperature regime below the source material's melting point, while still achieving sufficient vapor generation through the wick's enhanced vapor transport capability. This resolves the contradiction by decoupling vapor delivery efficiency from high heating temperatures
Solution Approach 2:
The invention optimizes the temperature parameter to operate below the melting point of the source material, preventing liquefaction and clogging. Simultaneously, the wick's capillary properties and surface area are optimized to maximize vapor transport efficiency at these lower temperatures, maintaining high ion production without compromising system stability
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
Stabilizes vapor generation, enhances ion beam current, and prevents clogging, thereby improving the efficiency and productivity of the ion implantation process.
Implementation Method 1
heating a solid source material containing a first metal element at a predetermined operating temperature to generate a vapor containing the first metal element
Implementation Method 2
generating a plasma containing ions of the first metal element using the vapor
Data Source
AI summary
An ion implantation method includes heating a solid source material containing a first metal element at a predetermined operating temperature to generate a vapor containing the first metal element, generating a plasma containing ions of the first metal element using the vapor, and implanting the ions of the first metal element obtained from the plasma into a workpiece, in which the solid source material contains a first material that contains the first metal element and has a melting point, a sublimation point, or a decomposition point lower than the operating temperature, and a second material that contains an oxide, a nitride, a carbide, or a metal and has a melting point, a sublimation point, or a decomposition point higher than the operating temperature.