Application of high-precision digital source meter in Hall effect testing
Time:
2024-11-06
Source:
According to relevant data statistics, driven by downstream applications such as AI, 5G, automotive intelligence, and the Internet of Things, the global total demand for semiconductors will continue to maintain stable growth in the next decade. With the continuous development of application technology, the requirements for characterization of semiconductor materials are also increasing. Hall effect testing is an important testing method for semiconductor materials, which can measure the conductivity type, carrier concentration, carrier mobility, resistivity, Hall coefficient and other parameters of semiconductor materials. It can also be used to study impurities and electroactive defects in semiconductors. Therefore, high-precision Hall characterization is particularly crucial for semiconductor materials.
When current passes through a semiconductor perpendicular to the external magnetic field, carriers are deflected, and an additional electric field is generated perpendicular to the direction of the current and magnetic field, resulting in a potential difference at both ends of the semiconductor. This phenomenon is known as the Hall effect, also known as the Hall potential difference. As shown in the figure, if a current Is is applied in the X direction and a magnetic field B is applied in the Z direction, the carriers (electrons) in the semiconductor will experience Lorentz force, resulting in an additional electric field - Hall electric field - on both sides of the semiconductor in the Y direction.
Place the Hall element of a certain semiconductor material at the corresponding position of the magnetic field to be measured, and make the element plane perpendicular to the magnetic induction intensity B (the magnetic induction intensity can be provided by the excitation device, and the Enzhi NGI 2600 series source meter provides the excitation current Im). The NGI N2600 source meter inputs a precise constant operating current Is at its control terminal, and the Hall voltage output terminal accurately measures the value of the Hall potential UH. Secondly, the N2600 series source meter can provide 1 and 3 quadrant current sources, allowing the input current at the control end to be positive and negative, and the excitation current to be positive and negative can also cause the excitation magnetic field to be positive and negative.
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