Plasma Source Zone Switching for Wafer Uniformity Control
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Solution Overview
Problem
Achieving high uniformity in plasma processing for semiconductor manufacturing is challenging due to the complex interplay of various factors such as plasma uniformity, chamber design, wafer temperature distribution, and bias electrode design, which often require large and expensive equipment.
Innovation Solution
The use of independently controlled plasma sources that can switch between high and low operational modes, allowing for time-dependent exposure of plasma-related fluxes to the substrate, thereby enabling precise control of the plasma process through zone control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large chamber dimensions and complex temperature control systems are used, then process uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The plasma source is divided into multiple independently controllable zones that can be selectively activated. This segmentation allows precise control of plasma flux distribution across the substrate without requiring complex chamber-wide temperature control systems, resolving the contradiction between uniformity and complexity
Solution Approach 2:
The system dynamically adjusts which plasma source zones are active based on real-time process requirements and substrate position. This dynamic control enables adaptive uniformity optimization without fixed complex hardware configurations, reducing device complexity while maintaining precision
2Manufacturing precision
If large plasma volume is used, then process uniformity is improved, but processing speed decreases
Solution Approach 1:
The plasma sources operate in periodic cycles, alternating between active and inactive states. During active periods, plasma is generated at high intensity; during inactive periods, sources are turned off. This periodic operation maintains uniformity through controlled exposure while increasing average processing speed, resolving the contradiction between uniformity and productivity
Solution Approach 2:
The system pre-configures which plasma source zones should be active before substrate processing begins. This preliminary zonation allows optimized plasma distribution patterns to be established in advance, achieving uniformity without requiring large plasma volumes, thereby maintaining high processing speeds
3Manufacturing precision
If complex temperature control measures are implemented, then process uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The system replaces complex mechanical temperature control mechanisms with a digital control system that manages plasma source zonation. By controlling which zones are active rather than physically adjusting temperature across the entire chamber, uniformity is achieved through software-based spatial-temporal control, significantly reducing manufacturing complexity and cost
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 improved process uniformity and increased substrate processing rates by optimizing plasma exposure durations, reducing the need for large equipment and complex temperature control systems.
Implementation Method 1
Plasma can modify a chemistry of a processing gas (e.g., generating ions, radicals, etc.), creating new species
Data Source
AI summary
A system and method including a processing device. The processing device receives data including one or more plasma exposure durations of a plasma process. The plasma exposure duration are associated with a set of controlled elements. The processing device causes a each set of controlled elements to switch between a first mode of operation and a second mode of operation. Each set of controlled elements expose appropriate portion of a substrate to the plasma related fluxes. The first set of controlled elements process the substrate at an increased rate while operating in the first mode of operation relative to the second mode of operation. The processing device causes each set of controlled elements to operate in the first mode of operation for the appropriate time duration based on the received plasma exposure duration data.