LAYER CHARACTERIZATION - Hall effect measurement systems

The HCS 1 is a powerful tool for characterizing semiconductors by measuring resistivity, mobility, charge carrier concentration and Hall coefficient.

The HCS 1 stage is equipped with two magnetic circuits (Neodymium), assembled on a moveable sledge, which optionally can be motorized.
The system can be equipped as well with extensions for low temperature (liquid nitrogen) and high temperature up to 240°C.

Different sample holders can be used depending on the geometry, size and thickness of the samples.

A software included, allows under Windows to find the measured parameters, to analyze the results and to draw I-V and I-R diagrams.

This tool allows the characterization of different materials specific to semiconductors: Si, SiC, SiGe, GaAs, InGaAs, InP, GaN (tpe N and type P) metal layers, conductive deposits, oxides ...

The HCS10 is a Hall effect measurement system with an electromagnet.

The water-cooled electromagnet works in combination with a programmable power supply and a current reversal switch.
The power supply can apply currents up to 75 A. The air gap coil or solenoid has an operating field strength between 0.8 and 1 Tesla (depending on the size of the air gap and configuration)

it is possible to take measurements up to 200 ° C.

Available in AC and DC version.

The HCS 10 DC uses a strong DC magnetic field for Hall measurements. The strength of the magnetic field can be adjusted within a range of -0.9T to + 0.9T for single point measurements.

The AC version of the HCS 10 allows measurement under a variable magnetic field with a maximum frequency of 0.1 Hz. For AC measurements, the Lock-In amplifier L79 / LIA is required. This configuration is recommended for the HCS 10, as it allows the measurement range to be extended (for example, for samples with low mobility of charge carriers).

The HCS 100 uses a magnet in Halbach configuration (permanent magnet in donut configuration called Halbach network coil), in order to apply a DC or AC magnetic field to the sample.
The Halbach network coil has a lower intrinsic inductance than conventional coils. Therefore, the Halbach network coil can produce a relatively high magnetic field at a lower inductance and, therefore, a higher power factor compared to conventional coils.

The magnet has a maximum magnetic flux density of 0.5 Tesla on a motorized stage.

It is possible to take high temperature measurements up to 500 ° C.

In combination with an alternating current, supplied by a lock-in amplifier, this setup is a powerful tool for studying difficult samples, as offsets and noise can be removed in most cases.