Plasma Ion Detector With Iris Aperture for Angle-Energy Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plasma processing systems lack precise methods for measuring the joint distribution function of ion angle and energy, which is crucial for accurately controlling plasma processes, especially for high aspect ratio structures in semiconductor fabrication.
Innovation Solution
A detector system comprising an insulating substrate with a conductive plate, iris diaphragm, and ion current collector, coupled with a rotatable gear and electrical equipment, is used to measure the joint distribution function of ion angle and energy by varying aperture size and electrical bias, enabling precise ion flux characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional plasma measurement methods are used, then the measurement system is simple, but the measurement precision of ion angle and energy distribution is insufficient
Solution Approach 1:
The detector is divided into multiple independent components: a conductive plate with aperture for ion entry, an iris diaphragm with adjustable aperture for angle selection, and a separate ion current collector. This segmentation allows each component to perform its specific function precisely, enabling accurate measurement of ion angle and energy distribution while maintaining modular device structure
Solution Approach 2:
The iris diaphragm is designed with movable blades that can dynamically adjust the aperture size to select different ion angles. The ion current collector can also be dynamically biased at different potentials to select ions of different energies. This dynamic adjustability enables precise measurement of the joint distribution function of ion angle and energy
2Adaptability or versatility
If a fixed aperture detector is used, then the device complexity is low, but the adaptability to measure different ion angles and energies is limited
Solution Approach 1:
The iris diaphragm incorporates movable blades that can be adjusted to change the aperture size, allowing the detector to adapt to different ion angle requirements. The ion current collector can be biased at different potentials to adapt to different ion energy measurements. This dynamic configuration provides versatility without requiring multiple fixed detectors
Solution Approach 2:
The detector design integrates multiple functions into a single device: the conductive plate with aperture serves as both an ion entry window and an angle reference, the iris diaphragm provides both mechanical support and angle selection, and the ion current collector serves as both a detection electrode and an energy selection element through biasing. This multi-functionality reduces the need for separate measurement devices
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
Enables accurate measurement of ion properties in plasma systems, improving the control and precision of plasma processes, particularly for high aspect ratio etching, enhancing semiconductor manufacturing efficiency.
Implementation Method 1
Ionization of neutral gas particles releases bound electrons to create highly mobile negatively charged free electrons and more heavy and sluggish positively charged ions
Implementation Method 2
The charge separation results in an electric field normal to the surface that retards the flux of negative charge (electrons) and accelerates the flux of positive charge (ions)
Data Source
AI summary
A detector for a plasma measurement system, where the detector includes an insulating substrate including a cavity; a conductive plate spanning an entrance to the cavity; a first aperture through the conductive plate; an iris diaphragm including movable blades around a second aperture, the second aperture being aligned to the first aperture; an ion current collector disposed in the cavity, the iris diaphragm being disposed between the ion current collector and the conductive plate; and a rotatable gear coupled to the movable blades of the iris diaphragm.