Objective: Investigating electrical conduction mechanisms in doped germanium with the Hall effect
The Hall effect occurs in electrically conductive materials located in a magnetic field B. The Hall voltage’s sign changes depending on whether the same current I is borne by positive or negative charge carriers. Its value depends on the charge carrier density. The Hall effect is consequently an important means of determining the mechanisms of charge transport in doped semiconductors. In this experiment, doped germanium crystals are examined at temperatures between 300 K and 450 K to ascertain the differences between electrical conduction enabled by doping, and intrinsic conduction enabled by thermal activation of electrons causing their transfer from the valence band into the conduction band.
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![DC Power Supply 20 V, 5 A
(230 V, 50/60 Hz), 1003312 [U33020-230], Power Supplies](/thumblibrary/U33020-230/U33020-230_01_140_140_DC-Power-Supply-20-V-5-A-230-V-5060-Hz.jpg)
![Transformer with Rectifier 3/6/9/12 V, 3 A (230 V, 50/60 Hz), 1003316 [U33300-230], Power Supplies](/thumblibrary/U33300-230/U33300-230_01_140_140_Transformer-with-Rectifier-36912-V-3-A-230-V-5060-Hz.jpg)
![Basic Hall Effect Apparatus, 1009934 [U8487000], Hall-effect](/thumblibrary/U8487000/U8487000_01_140_140_Basic-Hall-Effect-Apparatus.jpg)
![P-Doped Germanium on Printed Circuit Board, 1009810 [U8487020], Hall-effect](/thumblibrary/U8487020/U8487020_01_140_140_P-Doped-Germanium-on-Printed-Circuit-Board.jpg)
![N-Doped Germanium on Printed Circuit Board, 1009760 [U8487030], Hall-effect](/thumblibrary/U8487030/U8487030_01_140_140_N-Doped-Germanium-on-Printed-Circuit-Board.jpg)
![Pair of Pole Shoes and Clamping Brackets D for Hall Effect, 1009935 [U8497205], Demountable Transformer D](/thumblibrary/U8497205/U8497205_01_140_140_Pair-of-Pole-Shoes-and-Clamping-Brackets-D-for-Hall-Effect.jpg)
![Coil D with 600 Turns, 1000988 [U8497430], Demountable Transformer D](/thumblibrary/U8497430/U8497430_01_140_140_Coil-D-with-600-Turns.jpg)
![U Core D, 1000979 [U8497215], Demountable Transformer D](/thumblibrary/U8497215/U8497215_01_140_140_U-Core-D.jpg)
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![VinciLab 2, 1021477 [UCMA-001], Data logger](/thumblibrary/UCMA-001/UCMA-001_01_140_140_VinciLab-2.jpg)
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![Sensor Cable, 1021514 [UCMA-BTsc1], Additional Accessories for Computer-aided Experimentation](/thumblibrary/UCMA-BTsc1/UCMA-BTsc1_01_140_140_Sensor-Cable.jpg)
![Digital Oscilloscope, 2x30 MHz, 1020910 [U11834], Oscilloscopes](/thumblibrary/U11834/U11834_01_140_140_Digital-Oscilloscope-2x30-MHz.jpg)
![HF Patch Cord, 1m, 1002746 [U11255], Experiment Leads and Cables](/thumblibrary/U11255/U11255_01_140_140_HF-Patch-Cord-1m.jpg)
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![Control Unit for Spectrum Lamps (230 V, 50/60 Hz), 1021409 [U219051-230], Spectrum Tubes and Spectrum Lamps](/thumblibrary/U219051-230/U219051-230_01_140_140_Control-Unit-for-Spectrum-Lamps-230-V-5060-Hz.jpg)
![Plate Capacitor D, 1006798 [U8492355], Electrostatics](/thumblibrary/U8492355/U8492355_01_140_140_Plate-Capacitor-D.jpg)
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