Short for silicon-on-insulator
, a type of semiconductor
fabrication technique developed by IBM. Unlike CMOS
that are doped
with impurities that enable a chip to store capacitance
that must be discharged and recharged, SOI chips are formed by setting transistors
on a thin silicon
layer that is separated from the silicon substrate by an insulating layer of thin silicon oxide or glass, which minimizes capacitance (or the energy absorbed from the transistor).