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In page MOSFET:

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Following the development of clean rooms to reduce contamination to levels never before thought necessary, and of photolithography[1] and the planar process to allow circuits to be made in very few steps, the Si–SiO2 system possessed the technical attractions of low cost of production (on a per circuit basis) and ease of integration. Largely because of these two factors, the MOSFET has become the most widely used type of transistor in the Institution of Engineering and Technology (IET).[citation needed]