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  • optical-grade silicon The element that resembles a lightweight metal, but when very pure, has a very high electrical resistance and is transparent to the infrared between about 0.5 and 15 µm.
  • germanium A crystalline semiconductor material that transmits in the infrared.
  • compound semiconductor A semiconductor made up of two or more elements, in contrast to those composed of a single element such as germanium or silicon. In a III-V semiconductor, for example, one or more elements having three valence electrons (gallium, for instance) are...
  • semiconductor (SC) A material whose ability to conduct electricity falls between that of conductors and insulators. The conductivity of semiconductors can be controlled by adding specific amounts of impurities in a process called doping. That process changes the...
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