Experiment: Electrical Conduction, 115 V

Name: Experiment: Electrical Conduction, 115 V
Brand: 3B Scientific
SKU: ID2113296
Availability: InStock

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Product Details

Brand

3B Scientific

Manufacturer

N/A

Part Number

UE6020100-115

GTIN

755984447722

Condition

Product Description

3B Scientific, UE6020100-115, Experiment for Solid State Physics: Electrical Conduction in Semiconductors, 115 V, 50/60 Hz, Basic EquipmentUE6020100-115 Includes Only:Undoped Germanium on Printed Circuit BoardBasic Hall Effect ApparatusTransformer with Rectifier 3/6/9/12 V, 3 A (115 V, 50/60 Hz)Barrel Foot, 1 kgDigital Multimeter P3340Pair of Safety Experiment Leads, 75 cmPair of Safety Experiment Leads, 75 cm, blue, redFeatures:Objective: Determine band separation in germaniumSemiconductors only exhibit measurable electrical conductivity at high temperatures. The reason for this dependence on temperature is the band structure of the electron energy levels, which comprise a conduction band, a valence band and an intermediate zone, which in pure, undoped semiconductor materials cannot be occupied by electrons at all. As the temperature increases, more and more electrons are thermally excited from the valence band into the conduction band, leaving behind "holes" in the valence itself. These holes move under the influence of an electric field as if they were positive particles and contribute to the current much as electrons do. In order to determine the conductivity of pure, undoped germanium, this experiment involves sending a constant current through the crystal and measuring the voltage drop as a function of temperature. The data measured can be described by an exponential function to a good approximation, whereby the separation of bands appears as a key parameter.

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