Electrical Transport Properties Measurement System

The Electrical Transport Properties Measurement System is designed for advanced characterization of material electrical properties. It addresses critical factors often overlooked by users, including system integration, shielding and anti-interference performance, and matching between test circuits and sample resistance ranges.

The system incorporates Keithley electrical measuring instruments for high accuracy and reliability. Depending on user requirements, the magnetic field can be configured with either electromagnets or liquid helium-free superconducting magnets. With a smart measuring sample rod, plug-in sample cards, and specialized automated software, the system provides a user-friendly workflow for fast, precise, and repeatable testing.

Multiple high- and low-temperature environment options are available, making the system a powerful tool for researchers studying the electrical transport properties of materials.

• Measurement functions: Hall effect, R-H, R-T, and I-V characteristics
• Parameters derived: sheet resistance, resistivity, Hall coefficient, Hall mobility, carrier concentration, and conductivity type
• Real-time curve plotting: Parameter changes vs. temperature or magnetic field I-V characteristics under different temperatures and magnetic fields R-H curves at fixed temperature R-T curves at fixed magnetic field
• ASTM-F76 compliant testing for resistivity, Hall coefficient, and Hall mobility
• Wide resistance measurement range: 100 nΩ (low resistance option) – 100 GΩ (high resistance system)
• Plug-in sample card and four-probe card simplify sample installation and reduce electrode preparation effort
• Standard system supports two samples simultaneously; optional upgrade allows up to four samples
• Fast Hall measurement: automated data acquisition and calculation in just 3 minutes
• Stable long-term magnetic field, 24-hour stability <±0.5 G
• Smooth zero-field crossing capability
• Electromagnet power supply with built-in gauss meter for precise control (0–1 kG within 20 seconds, accuracy 0.1 G)
• Temperature options available for Hall effect and resistance tests at different temperatures

• Keithley precision electrical measurement instruments
• Electromagnet or liquid helium-free superconducting magnet (user-selected)
• Smart sample rod and plug-in sample cards
• Automated software for streamlined measurement and data processing

• Fully automated measurement process with minimal operator input
• Real-time calculation of parameters including resistivity, Hall coefficient, mobility, and carrier concentration
• Curve plotting: I-V, R-T, R-H, and temperature/magnetic field dependencies
• One-click report generation and data export for analysis

• Liquid helium-free superconducting magnetic field cryogenic platform (CFMS series, UK Cryogenic Company): Magnetic field range: 5 T – 18 T Temperature range: 1.6 K – 400 K
• Temperature options: liquid nitrogen chamber, liquid nitrogen thermostat, closed-cycle thermostat, high-temperature furnace
• Optical options: polar head pole, light shielding box with optical path
• Other options: rotating mechanism, vacuum pump, circulating water cooling unit

Note: Assuming sample thickness of 100 nm, magnetic field of 10,000 Gauss, and correction coefficient of 1:

• Resistance test accuracy: ±2%
• Resistivity, Hall coefficient, carrier concentration, and mobility test accuracy: ±5%