In 1879, Hall discovered that the conductor generated an electromotive force in a direction perpendicular to the magnetic field and current, and this electromagnetic effect was called the "Hall effect." In semiconductor materials, the Hall effect is much larger than in metal materials. Using the Hall effect, the conductivity type and carrier concentration of the semiconductor can be determined. If the Hall effect changes with temperature is further measured, the forbidden band width of the semiconductor, the ionization energy of the impurity, and the temperature characteristics of the mobility can be determined. Therefore, the Hall effect experiment is an important method to study the electrical properties of semiconductor materials.
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