Band gap of germanium Principle The conductivity of a germanium test sample is measured as a function of temperature. The energy gap is determined from the measured values. Benefits - Hall effect unit to control all parameters (temperature, voltage) and supports intrinsic , p- and n-type Ge crystals
- Can also be used to study Hall effect in p and n-type Ge
Tasks - The current and voltage are to be measured across a germanium test-sample as a function of temperature.
- From the measurements, the conductivity s is to be calculated and plotted against the reciprocal of the temperature T. A linear plot is obtained, from whose slope the energy gap of germanium can be determined.
Learning objectives - Semiconductor
- Band theory
- Forbidden band
- Intrinsic conduction
- Extrinsic conduction
- Impurity depletion
- Valence band
- Conduction band
Scope of delivery |
PHYWE Hall-effect unit HU 2
|
11801-01
|
1
| |
Intrinsic conductivity Ge, carrier board
|
11807-01
|
1
| |
PHYWE Digital multimeter, 600V AC/DC, 10A AC/DC, 20 MΩ, 200 µF, 20 kHz, −20°C…760°C
|
07122-00
|
2
| |
PHYWE Power supply, 230 V, DC: 0...12 V, 2 A / AC: 6 V, 12 V, 5 A
|
13506-93
|
1
| |
Tripod base PHYWE
|
02002-55
|
1
| |
Stand rods, stainless steel, various sizes
|
02031-00
|
1
| |
Right angle clamp expert with fulcrum screw
|
02054-00
|
1
| |
Connecting cable, 32 A, red, various lengths
|
07360-01
|
1
| |
Connecting cable, 32 A, blue, various lengths
|
07360-04
|
1
| |
Connecting cable, 32 A, black, various lengths
|
07361-05
|
2
|
|
Service
