Introduction to Hall effect measurement - new video from Lake Shore
Lake Shore's: "How Does it Work?" education series has a new video:
The video uses animations to illustrate Hall effect and explores the procedure of conducting Hall effect measurements on a semiconductor material using the van der Pauw sample geometry and measurement method.
With an accurate measurement of the material resistivity and Hall effect, a researcher can calculate derived parameters such as carrier type (p-type or n-type), carrier concentration or carrier density, and mobility.
The video goes step-by-step through the process of conducting a Hall effect measurement, from sample geometry selection to the formulas required to calculate the derived parameters, and is an excellent tool for those new to Hall effect measurement.
Isolating the Hall voltage requires a series of steps to remove undesired voltage effects such as thermoelectric voltage, resulting from dissimilarities in the material, and misalignment voltage that is a result of the geometry of the sample. These effects are removed using current reversal and field reversal techniques discussed in the video.
As this video is a primer on the subject of Hall effect measurement, it doesn't get into some of the more complex aspects such as contact quality and photoconductive and photovoltaic effects.