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schuch licht electrical components are electronic devices with conductivity between that of good conductors and insulators, utilizing the special electrical properties of semiconductor materials to perform specific functions. They can be used to generate, control, receive, transform, and amplify signals, as well as perform energy conversion. The semiconductor materials in semiconductor devices are silicon, germanium, or gallium arsenide, and they can be used as rectifiers, oscillators, light emitters, amplifiers, photodetectors, and other equipment. To distinguish them from integrated circuits, they are sometimes referred to as discrete devices. The basic structure of most two-terminal devices (i.e., crystal diodes) is a PN junction.