What material is computer's processor made of?

single crystal ruby
single crystal silicon
silicon polycrystal
pyrite crystal
Single crystal silicon is used in the fabrication of semiconductors. On the quantum scale that microprocessors operate on, the presence of grain boundaries would have a significant impact on the functionality of field effect transistors by altering local electrical properties. Therefore, microprocessor fabricators have invested heavily in facilities to produce large single crystals of silicon.
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single crystal ruby
single crystal silicon
silicon polycrystal
pyrite crystal
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