Related Products
Impedans Vertex RFEA System
Vertex RFEA System

The Vertex Retarding Field Energy Analyser (RFEA) system measures the Ion flux and Ion energy distribution function (IEDF) incident on a surface in real time using an imitation substrate with replaceable, integrated sensors. The Vertex Multi sensor system can have up to 13 sensing elements distributed around the imitation substrate, primarily to investigate the uniformity of the ion energy and ion flux at the substrate in industrial plasma applications. The Vertex system can also measure these parameters for a range of configurable Aspect Ratios (ARs) ranging from 0.5 to 20, with a resolution of 0.5, to understand their influence on deep trench etching. A variety of replaceable sensing elements are available with different sensitivities for compatibility with a wide range of plasma densities and discharge pressures.

Key Features
Measure the Ion Flux and Ion Energy Distribution with energy range up to 2000eV (process dependant).
Aspect Ratio scans ranging from 0.5 to 20. Suitable for Grounded, Floating and RF Biased conditions
Up to 13 sensors integrated into a single holder allowing uniformity measurements
Holders with different geometries available upon request
Fully automated software analysis including IEDF adjustment for sensor DC bias potential
Replaceable sensor elements with different sensitivities ranging from 0.001 Am-2 to 700 Am-2.
Sensor elements and holder available in anodised aluminium, bare aluminium or stainless-steel options.
Key Benefits
Portable system allowing analysis in multiple chambers using a single sensor.
Provides in-situ measurement of Ion Energy Distribution (IED) under plasma processing conditions.
Automatically generates contour maps of energy and flux uniformity over the wafer area.
Provides insight for fundamental research and for plasma model validation.
Generates process data for customer escalations or product marketing.
Correlates process performance with the key plasma process drivers (Ion Energy and Ion Flux).

Electronics Box

The Vertex Retarding Field Energy Analyser (RFEA), electronics box is calibrated accurately for voltages ranging from -2000V to +2000V and currents ranging from 100 pA to 60 mA.

Model Types Length Description


Semion Electronics Unit



The vacuum feed-through transmits electrical signals by connecting the Electronics box from outside the vacuum chamber to the Semion sensor inside the vacuum chamber.

Model Number Product Name Description


Semion Multi Feedthrough

Flange Type CF40 (custom available)


Semion Multi Time Resolved Feedthrough

Flange Type CF40 (custom available)


Button Probes

The Button probes of the sensor are designed to be disposable. Once the measurements start to drift, one can simply replace the sensor and continue measurements.

Model Type Button Type Description


Low Density


Standard Density


High Density



The main purpose of the sensor holder is to hold the replaceable Button Probe sensors. It can withstand temperatures up to 150<sup>o</sup>C without the need for cooling.

Model Number Product Name Description


50 mm Single Holder

Single holders available from 50 mm to 450 mm


70 mm Single Holder


150 mm Multi Holder


200 mm Multi Holder


300 mm Multi Holder


450 mm Multi holder

RFEA Probe Specifications
Number of sensors (Button Probes)
1 to 13 ( depending on holder)
Probe configuration
Button Probe diameter (sensing element)
Holder diameter
50 - 450 mm diameter options (custom avilable)
Holder thickness
Max. operating temperature
Button Probe material
Aluminium, anodised aluminium, stainless steel
Holder material
Aluminium, anodised aluminium, stainless steel
RFEA Probe cable length
650 mm (custom available)
Flange Type
CF40 as standard, KF40 and custom options available
Vertex System Specifications
Aspect Ratio Range
0.5 to 20
Aspect Ratio Resolution
Ion Energy Range
2000 eV (Low/Standard/High Density Button Probe)
150 eV (High Pressure Button Probe)
Ion Flux
0.001 to 3 Am-2 (Low Density Button Probe)
0.01 to 50 Am-2 (Standard Density Button Probe)
0.1 to 700 Am-2 (High Density Button Probe)
Pressure Range
Pressure Range
≤ 300 mTorr (Low/Standard/High Density Button Probe)
≤ 1.5 Torr (High Pressure Button Probe)
IEDF Resolution
±1 eV nominal
Ion Desity Range
1012 to 1018 m-3 (Button Probe dependent)
Max. RF Bias Voltage (applied to probe)
1 kV**(peak to peak)
Max. DC Bias Voltage
-1940 V
Bias Frequency Range
100 kHz to 80 MHz
Sync Frequency Range (Time Resolved)*
4 Hz to 100 kHz
Time Resolved Method*
Boxcar intergration
Time Resolved*
100 µs
* For Pulsed Plasmas with Vertex sensor mounted on a grounded electrode. Aspect Ratio scan not available in time resolved mode.

** @ 13.56 MHz. Reduces to 0.3 kV @ 60 MHz

Software Screenshots

Ion current, Ion Flux and Aspect Ratio plot.
Ion Energy Contour Map.
IV curve and IEDF at Grounded electrode.
Talk to Us Today

Do you want to learn more about our sensors or applications? Contact us and a member of the team will get back to you