HALL EFFECT MEASUREMENT SYSTEM
- Product Code: HALL-EFFECT-MEASUREMENT-SYSTEM
- Availability: In Stock
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HALL EFFECT MEASUREMENT SYSTEM
FYTRONIX Hall effect systems measure electrical properties of semiconductor materials
Tesla permanent magnet: 0-41- 0.51 Tesla (+/-0.03Tesla)
Conductive sample mounting board
System automatically measure
Mobility
Carrier concentration
Resistivity
Hall coefficient
Conductivity
Sheet resistance
Four probe resistance measurement
Measurement ranges:
- resistivity range: 10-4 to 107 Ohms-cm
- Hall voltage range: 1µV to 2000 mV
- mobility: 1 to 107 cm2/V.s
Density (cm-3): 107 ~ 1021
Magnet : Permanent magnet (diameter: 50mm)
Magnet Flux Density: 0.4- 0.55T nominal +/-1% of marked value Stability: 2% over 1 years Uniformity: +/- 1% over 20mm diameter from center Pole Gap: 26 mm
Current source: Range: 1nA, -250mA , Six ranges
Sample holder: Sample board
Electronic Contact switching card
Six stage current ranges (DC only) Provides bulk/sheet carrier concentration, mobility,
Hall coefficient, bulk resistivity, conductivity, magneto resistance, and alpha (Vertical/Horizontal ratio of resistance).
- Temperature controller
- Measurement Temperature: - From 80K to 350K. (variable temp) - Accuracy: ±0.5K.
- Open Nitrogen Low temperarture cryostat: 80 K-350 K
- Resolution: ±1K.
- Max Sample Size: 20mm x 20mm
- Sample Holder
THE VAN DER PAUW METHOD
The van der Pauw Method is a technique commonly used to measure the sheet resistance and the Hall Coefficient of a sample. Its power lies in its ability to accurately measure the properties of a sample of any arbitrary shape, so long as the sample is approximately two- dimensional (i.e. it is much thinner than it is wide) and the placement of the electrodes is known.
From the measurements made, the following properties of the material can be calculated:
♦ The sheet resistance, from which the resistivity can be inferred for a sample of a given thickness.
♦ The doping type (i.e. if it is a P-type or N-type) material.
♦ The sheet carrier density of the majority carrier (the number of majority carriers per unit area). From this, the density of the semiconductor, often known as the doping level, can be found for a sample with a given thickness.
♦ The mobility of the majority carrier.
