Principle
The resistivity and Hall voltage of a rectangular germanium sample 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
1.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).
2.The voltage across the sample is measured at room temperature and constant control current as a function of the magnetic induction B.
3.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.
4.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.
5.The Hall voltage UH is measured as a function of temperature at constant magnetic induction B and the values are plotted on a graph.
What you can learn about
Semiconductor
Band theory
Forbidden zone
Intrinsic conductivity
Extrinsic conductivity
Valence band
Conduction band
Lorentz force
Magnetic resistance
Mobility
Conductivity
Band spacing
Hall coefficient
Materiallist Product Amount
Measuring module, Tesla 12109-00 1
Software Cobra3-hall effect 14521-61 1
Power supply 12V / 2A 12151-99 1
Cobra3 BASIC-UNIT, USB 12150-50 1
Connecting cord, 32 A, 750 mm, black 07362-05 2
Connecting cord, 32 A, 500 mm, blue 07361-04 1
Right angle clamp -PASS- 02040-55 1
Connecting cord, 32 A, 500 mm, red 07361-01 2
Support rod -PASS-,square,l 250mm 02025-55 1
Tripod base -PASS- 02002-55 1
Pole pieces,plane,30x30x48mm, 2 06489-00 1
Power supply 0...12 V DC/ 6 V, 12 V AC, 230 V 13505-93 1
Hall probe, tangential, protection cap 13610-02 1
Iron core, U-shaped, laminated 06501-00 1
Hall effect,p-Ge,carrier board 11805-01 1
Coil, 600 turns 06514-01 2
Data cable, plug/ socket, 9 pole 14602-00 1
Hall effect module 11801-00 1
