In 1879 a physicist called Edwin Hall discovered that electrical current would bend when they are placed in a magnetic field, releasing a voltage and electric field which are perpendicular to the current. Researchers have observed this phenomenon, which is known as the Hall Effect, and learned valuable information which has been used in the development of powerful technological advances, including the semiconductors which are essential for microchips.
However, there was also a major downside as the Hall effects don’t allow researchers to perform select measurements at the same time. A mixed team of researchers from several institutions has created a new technique that allows them to extract this coveted information.
The method, which is currently known as the carrier-resolved-photo-Hall measurement technique, could play an important role in the future, enhancing the development of advanced solutions as powerful solar cells and other valuable materials.
Electrical charges will travel through semiconductors in the form of discrete units, which are classified as charge carriers: electrons with negative charges and electron voids with a positive charge, which can move like electrons. The Hall effects allow researchers to measure the properties of charge carriers that are present in a material, among which we can count the speed and their density.
In recent times the same effect was used to observe the effect of light on select materials by targeting them with artificial lighting strikes and analyzing the presence of electrons and electron voids. The old method restricted measurements to the major charge carrier, effectively dismissing the presence of minor charge carries. This means that only electrons are visible if there are more electrons, and the same rule is available for electron voids.
The new measuring technique is made even better by the fact that it can mitigate noise, increasing the accuracy of the collected data in the long run.
More information can be found in a study that was published in a scientific journal.