Hall effect in n- and p-germanium (Teslameter) Principle The resistivity and Hall voltage of 2 rectangular germanium samples ( n- and p-) are measured as a function of temperature and magnetic field. The band spacing, the specific conductivity, the type of charge carrier and the mobility of the charge carriers are determined from the measurements. Tasks - The Hall voltage is measured at room temperature and constant magnetic field as a function of the control current and plotted on a graph (measurement without compensation for defect voltage).
- The voltage across the sample is measured at room temperature and constant control current as a function of the magnetic induction B.
- The voltage across the sample is measured at constant control current as a function of the temperature. The band spacing of germanium is calculated from the measurements.
- The Hall voltage UH is measured as a function of the magnetic induction B, at room temperature. The sign of the charge carriers and the Hall constant RH together with the Hall mobility mH and the carrier concentration p are calculated from the measurements.
- The Hall voltage UH is measured as a function of temperature at constant magnetic induction B and the values are plotted on a graph.
Learning objectives - Semiconductor
- Band theory
- Forbidden zone
- Intrinsic conductivity
- Extrinsic conductivity
- Valence band
- Conduction band
- Lorentz force
- Magnetic resistance
- Mobility
- Conductivity
- Band spacing
- Hall coefficient
Scope of delivery
PHYWE Hall-effect unit HU 2
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11801-01
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1
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Hall effect, p-Ge, carrier board
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11805-01
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1
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Hall effect, n-Ge, carrier board
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11802-01
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1
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Coil, 600 turns
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06514-01
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2
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Iron core, U-shaped, laminated
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06501-00
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1
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Pair of pole pieces, plane, 30 x 30 x 48 mm
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06489-00
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1
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Hall probe, tangential, protection cap
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13610-02
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1
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PHYWE Power supply, 230 V, DC: 0...12 V, 2 A / AC: 6 V, 12 V, 5 A
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13506-93
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1
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Tripod base PHYWE
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02002-55
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1
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Stand rods, stainless steel, various sizes
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02031-00
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1
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Right angle clamp expert with fulcrum screw
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02054-00
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1
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Connecting cable, 32 A, red, various lengths
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07361-01
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3
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Connecting cable, 32 A, blue, various lengths
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07361-04
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2
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Connecting cable, 32 A, black, various lengths
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07362-05
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2
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PHYWE Teslameter, digital
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13610-93
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1
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PHYWE Digital multimeter, 600V AC/DC, 10A AC/DC, 20 MΩ, 200 µF, 20 kHz, −20°C…760°C
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07122-00
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1
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