Intermediate Chamber Vapor Etching for Uniform Large-Substrate Processing
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Solution Overview
Problem
Existing semiconductor processing technologies face challenges in achieving uniform etching across large substrates with significant topography, particularly in thermal and plasma etching processes.
Innovation Solution
A semiconductor etching device with an intermediate chamber and controlled valve system that regulates the flow of etch reactant vapor, allowing for pulsing and precise control of etch reactant dosage and partial pressure to achieve uniform etching across large substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional thermal or plasma etching is used, then etching can be performed on substrates, but uniform etching effects across large substrates with significant topography cannot be achieved
Solution Approach 1:
The system segments the continuous etching process into discrete pulsing cycles, where reactant vapor is introduced in controlled pulses rather than continuously. This segmentation allows precise control over reactant dosage and timing, enabling uniform etching across large substrates by ensuring consistent reactant distribution during each pulse cycle.
Solution Approach 2:
The system employs periodic pulsing of etch reactant vapor into the reaction chamber, creating cyclic exposure patterns. This periodic action allows the substrate surface to be uniformly treated across its entire area by repeatedly exposing different regions to controlled amounts of reactant vapor during successive pulses, achieving conformal etching on large substrates with topography.
2Manufacturing precision
If conventional continuous etching is used, then etching process can proceed continuously, but precise control over etch reactant dosage and partial pressure is difficult to achieve
Solution Approach 1:
The system dynamically adjusts the etching process by controlling the timing, duration, and intensity of reactant vapor pulses. The pulsing mechanism allows real-time modulation of reactant dosage and partial pressure, providing precise control over etching parameters while maintaining high throughput through optimized pulse frequencies and durations.
Solution Approach 2:
The system incorporates feedback control through the pulsing mechanism, where the etching process parameters (dosage, partial pressure) are continuously monitored and adjusted by controlling the reactant vapor pulse timing and intensity. This feedback loop ensures precise dosage control while maintaining productivity by optimizing each pulse cycle based on process requirements.
3Manufacturing precision
If etch reactant vapor is continuously supplied to large substrates, then continuous etching can be performed, but uniform distribution and conformality are compromised
Solution Approach 1:
The reactant delivery system is segmented into a source chamber and a reaction chamber separated by a showerhead. This segmentation allows the reactant vapor to be generated in a controlled source environment and then distributed uniformly across the reaction chamber through the showerhead structure, achieving spatial uniformity without requiring complex delivery mechanisms throughout the entire substrate area.
Solution Approach 2:
The showerhead acts as an intermediary component between the reactant source and the substrate. It receives the etch reactant vapor from the source chamber and distributes it uniformly across the reaction chamber, ensuring conformal coverage of large substrates. This intermediary structure simplifies the overall delivery system while achieving the desired spatial uniformity and conformality.
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 provides improved spatial uniformity and conformality in etching processes, ensuring consistent etch rates and distribution across substrates through controlled pulsing of etch reactants.
Implementation Method 1
a source of etch reactant vapor upstream of and in fluid communication with the intermediate chamber, the source being configured to deliver the etch reactant vapor to the intermediate chamber
Implementation Method 2
an intermediate chamber upstream of and in fluid communication with the reaction chamber, the intermediate chamber being configured to deliver an etch reactant vapor to the reaction chamber
Data Source
AI summary
A semiconductor vapor etching device is disclosed. The device can include an intermediate chamber between a vapor source and a reaction chamber. Etch reactant vapor can be pulsed from the intermediate chamber to the reaction chamber to etch a substrate.