DX-1000T High and Low Temperature Hall Effect Test System

The DX-320 effector specially developed for this instrument system integrates a constant current source, a six and a half microvolt meter and a complex switching relay-switch for Hall measurement, which greatly reduces the connection and operation of the experiment. DX-320 can be used as a constant current source and microvoltmeter alone.

It is used to measure important parameters such as carrier concentration, mobility, resistivity, and Hall coefficient of semiconductor materials. These parameters must be controlled in advance to understand the electrical properties of semiconductor materials. Therefore, the Hall effect test system is an important tool for understanding and researching semiconductor devices. and electrical properties of semiconductor materials.

The experimental results are automatically calculated by the software, and parameters such as Bulk Carrier Concentration, Sheet Carrier Concentration, Mobility, Resistivity, Hall Coefficient, and Magnetoresistance can be obtained at the same time.

Testable materials:

1. Semiconductor materials: SiGe, SiC, InAs, InGaAs, InP, AlGaAs, HgCdTe and ferrite materials, etc.;
2. Low impedance materials: graphene, metals, transparent oxides, weakly magnetic semiconductor materials, TMR materials, etc.;
3. High resistance materials: semi-insulating GaAs, GaN, CdTe, etc.

Technical indicators

1. Magnetic field: 10mm pitch is 2T, 30mm pitch is 1T;
2. Sample current: 0.05uA~50mA (adjust 0.1nA);
3. Measuring voltage: 0.1uV~30V;
4. Provide various test standard materials, silicon and gallium arsenide of various levels (different sensitivity and precision);
5. Minimum resolution: 0.1GS;
6. Magnetic field range: 0-1T;
7. Cooperate with gauss meter or digital acquisition board to communicate with computer;
8. I-V curve and I-R curve measurement, etc.;
9. Change curves of parameters such as Hall coefficient and carrier concentration with temperature;
10. Resistivity range: 10^-7~10¹² Ohm*cm;
11. Resistance range: 10 m Ohms~ 6MOhms;
12. Carrier concentration: 10³~10²³cm^-3;
13. Mobility: 0.1~10⁸cm²/volt*sec;
14. Temperature adjustment 0.1K;
15. Temperature zone: 77K-470K;
16. Fully automated testing, one-key processing;
17. Continuous measurement between the same temperature difference can be realized.

Parameters of each component:
 

High precision electromagnet

1. Pole diameter 100mm;
2. When the distance between N and S is 10mm, the maximum magnetic field is 20000Gs;
3. When the distance between N and S is 20mm, the maximum magnetic field is 13000 Gauss;
4. The maximum magnetic field is 10000 Gauss when the distance between N and S is 30mm;
5. Uniform area: 10mm diameter at 60mm spacing, uniformity range 1%;
6. Weight 210 kg (including bracket and wheels).

High-precision bipolar constant current power supply

1. Output: ±10A±80V;
2. Power; 800W;
3. The output current of the power supply can change continuously between positive and negative rated maximum current;
4. The current can smoothly cross the zero point and reverse without switching;
5. Output current and voltage four-quadrant operation (suitable for inductive loads);
6. The current change rate can be set in the range of 0.0007~0.3 F.S./s (F.S. is the rated maximum output current);
7. Current stability: better than ±25ppm/h (standard type); better than ±5ppm/h (high stability type);
8. Current accuracy: ± (0.01% set value + 1mA); 
9. Current resolution: 20 bit, e.g. 15A power supply, current resolution is 0.03mA;
10. Source effect: ≤ 2.0×10^-5 F.S. (when the power supply voltage changes by 10%, the output current changes);
11. Load effect: ≤ 2.0×10^-5 F.S. (output current change when load changes by 10%);
12. Current Ripple (RMS): Less than 1mA.

High precision gauss meter:

1. Accuracy: ±0.30% of reading;
2. Resolution: 0.01mT Range: 0-3T;
3. Probe thickness: 1.0mm;
4. Length: 100mm digital;
5. Rs-232 interface data reading software equipped with GP3 probe;
6. Gauss meter probe bracket and sample holder All-aluminum non-magnetic bracket 5-70mm adjustable;
7. Sample holder fixture (customized upon request).

High and low temperature thermostat:

1. (80K-470K) high and low temperature vacuum vessels;
2. TESTIK301 thermostat temperature control (65k-600k);
3. Vacuum Pump K25 Vacuum Pump.

Constant current source and test table

1. Constant current source range: ±50nA-±50mA;
2. Resolution 0.1nA, continuously adjustable within the range;
3. High-precision voltage data acquisition instrument range 0. 1uV-30V;
4. Accuracy: 0.01%;
5. Built-in test matrix conversion card;
6. Ohmic Contact Kit: Make kits based on Ohmic contacts of different materials.