A four-point probe is a method used to measure the electrical resistivity of materials by placing four equally spaced probes in contact with the surface of a sample. This technique helps eliminate contact resistance that can distort measurements, making it crucial for characterizing thin films and their properties. By applying a known current through the outer probes and measuring the voltage across the inner probes, accurate resistivity values can be obtained, which are essential for understanding film quality and performance.
congrats on reading the definition of four-point probe. now let's actually learn it.