Precursor Delivery Line Heating for Clean Vapor Deposition
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Solution Overview
Problem
The challenges of organic vapor deposition in semiconductor manufacturing include purity and contamination concerns due to residual precursor condensation, thermal control issues, and inefficient precursor delivery, leading to wafer contamination and reduced consumption efficiency.
Innovation Solution
A controlled precursor delivery system using sublimators with dual heat sources and valves to manage the flow of process materials, ensuring thermal isolation and uniform delivery, preventing condensation and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If precursor material is continuously delivered to the deposition chamber, then deposition rate is improved, but residual precursor condenses in the delivery lines causing contamination and particle formation
Solution Approach 1:
The patent extracts the precursor delivery function from the main deposition chamber by using separate delivery lines with independent thermal control. The delivery lines are heated to prevent condensation, while the deposition chamber maintains conditions for actual deposition. This separation allows continuous precursor delivery without contamination from condensation in the delivery lines.
Solution Approach 2:
Different thermal conditions are applied to different parts of the system. The delivery lines are heated to a temperature that prevents precursor condensation, while the deposition chamber is maintained at a lower temperature appropriate for deposition. This local differentiation of thermal quality prevents contamination while maintaining high deposition rates.
2Manufacturing precision
If carrier gas is used to deliver precursor material, then delivery uniformity is improved, but purity is reduced due to contamination from residual precursor condensation
Solution Approach 1:
The patent introduces heated delivery lines as an intermediary between the precursor source and the deposition chamber. These lines act as a thermal mediator that prevents precursor condensation while allowing carrier gas to transport the precursor uniformly. The intermediary heated zone eliminates the harmful condensation effect while preserving the beneficial uniform delivery.
3Productivity
If multiple precursors are delivered simultaneously, then process efficiency is improved, but thermal cross-talk between precursors occurs causing contamination
Solution Approach 1:
The patent segments the delivery system into separate heated delivery lines for each precursor material. Each line is independently heated and controlled, preventing thermal cross-talk between different precursors. This segmentation allows multiple precursors to be delivered simultaneously without contamination while maintaining high process efficiency.
4Loss of substance
If precursor shut-off is implemented to prevent over-flood, then consumption efficiency is improved, but residual precursor in lines continues to condense causing particles
Solution Approach 1:
The patent applies preliminary heating to the delivery lines before precursor delivery begins. This pre-heating action ensures that when precursor is shut off after deposition, the residual precursor in the lines remains in vapor phase and does not condense to form particles. The preliminary thermal preparation prevents the harmful effect of post-shut-off condensation.
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 system enhances deposition efficiency, reduces contamination, and maintains uniform precursor delivery, improving throughput and consumption efficiency while preventing thermal cross-talk between different process materials.
Implementation Method 1
a first heat source, the first heat source being a radiant heat source adjacent the ampoule
Implementation Method 2
a second heat source, the second heat source being adjacent the opening
Implementation Method 3
flowing the one or more vapor precursors through one or more delivery lines in fluid communication with a deposition chamber
Data Source
AI summary
Methods and apparatus for controlling a flow of process material to a deposition chamber. In embodiments, the apparatus includes a deposition chamber in fluid communication with one or more sublimators through one or more delivery lines, wherein the one or more sublimators each include an ampoule in fluid communication with the one or more delivery lines through an opening, and at least a first heat source and a second heat source, wherein the first heat source is a radiant heat source adjacent the ampoule and the second heat source is adjacent the opening, wherein the one or more delivery lines include one or more conduits between the deposition chamber and the one or more sublimators, and wherein the one or more conduits include one or more valves to open or close the one or more conduits, wherein the one or more valves in an open position prevents the flow of process material into the deposition chamber, and wherein the one or more valves in a closed position directs the flow of process material into the deposition chamber.