Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

The Czochralski process can be used to obtain very small parts of these materials, while various recombination processes for them include photon exchange and one named after Auger. The drift mobility and diffusion coefficient of excess carriers in this kind of material can be measured by the Haynes-Shockley experiment, while Andersons rule is used to construct diagrams of the heterojunction between two materials of this type. Whether these materials contain a negative or positively charged current carrier distinguishes the N- and P-types, while adding impurities to their crystal lattices is known as doping. FTP, name these materials which are often found in diodes and transistors and have electrical conductivities between that of insulators and conductors.

Science