The system is composed of high uniformity of electromagnet, electromagnet power, high-precision voltage meter, constant current source, a sample holder, standard sample, high and low temperature dewar, temperature control equipment, vacuum pump, system software. Forthe carrier concentration, measurement of semiconductor material migration rate, important parameters of resistivity, Holzer coefficient, and these parameters is to understand theelectrical properties of semiconductor materials must be controlled, therefore the testing system of Holzer effect is essential for understanding and study of semiconductor devices and semiconductor material electrical properties of tool.

Temperature dependent Holzer effect system is composed of high uniformity of electromagnet,electromagnet power, high-precision voltage meter, constant current source, a sample holder,standard sample, high and low temperature dewar, temperature control equipment, vacuum pump, system software. For carrier concentration, measurement of semiconductor material migration important parameters rate, resistivity, Holzer coefficient, and these parameters is to understand the electrical properties of semiconductor materials must be pre control, therefore the testing system of Holzer effect is essential for understanding and study of semiconductor devices and semiconductor material electrical properties of tool.

The instrument can be used for the Holzer effect, the rate of migration, resistivity, Holzercoefficient, magnetoresistance, carrier type, carrier type transformation demonstration and students' experiments. Can also lead solder off in the cryostat random samples, change usersamples for scientific research; for example study on temperature dependence ofmagnetoresistance, superconductivity, resistance temperature characteristics, temperature,variable temperature magnetic photoelectric light (sold separately with optical window tail sheath) etc.. With wide application, low cost and convenient use.

The Holzer effect is the essence of: solid materials in the carrier of the external magnetic field,due to the Lorentz force and the track offset, and generates a charge accumulation in thematerial on both sides, forming an electric field perpendicular to the current direction, the final carrier by Lorentz Lorentz force and electric repulsion phase equilibrium, and thus establish aa stable potential Holzer voltage on both sides.

According to a lot of research: reveal in material of conductive process not only have the negatively charged electrons, and positively charged holes. However, the student to the hole conduction understanding often is vague, therefore, we should be teaching physicsCommission requirements, design the testing system of temperature of Holzer effect, to carry out the experiment of high grade students for College Physics Department, material department, electronics department and other related department. The instrument systemafter several improvements, give full consideration to the safety of students experimental requirements and price, very suitable for experimental teaching.