Anything that switches at the will of its creator from being an insulator to a conductor then back to an insulator is technically called a semiconductor. Without it, the physics of solid states microelectronics cannot be possible and consequently computers, cell phones, internet, and many other solid states devices would not be realized.

The precursor device is called a transistor. Its long historical development from the closing of the 1940s to the super ultra miniaturization of eventually becoming a quantum optical computer can be helped established by the science of integrated circuitry at the realm of nanotechnology or more advanced picotechnology, femtotechnology, attotechnology, zeptotechnology, or yoctotechnology. However, at the tiny variations of the immediate subluminal neighborhood of the false vacuum there ought to be analogously vacuum semiconductors of the first, second, and third kind.