The term nanocomputer is increasingly used to refer to general computing devices of size comparable to a credit card.
Moore's Law in the next 40 years brought features 1/100 the size, or ten thousand times as many transistors per square millimeter, putting smartphones in every pocket.
There used to be consensus among hardware developers that it is unlikely that nanocomputers will be made of semiconductor transistors, as they seem to perform significantly less well when shrunk to sizes under 100 nanometers.
The International Technology Roadmap for Semiconductors in the 2010s gave an industrial consensus on feature scaling following Moore's Law.
A silicon-silicon bond length is 235.2 pm,[4] which means that a 5 nm-width transistor would be 21 silicon atoms wide.