Why is Robert Noyce associated with the planar process for making integrated circuits?

Robert Noyce is associated with the planar process because he recognized its potential to solve the critical challenge of interconnecting components within an integrated circuit.1

While his colleague Jean Hoerni originally engineered the planar process—which uses a protective layer of silicon oxide to shield transistors—Noyce expanded this innovation to the entire circuit. At the time, manufacturers typically cut individual components from silicon wafers and connected them with wires, a process that became increasingly difficult as components shrank.12

Noyce realized that instead of cutting the wafer, he could manufacture an entire circuit on a single piece of silicon and use the planar process to evaporate conductive metal lines directly onto the surface to serve as the "wires". This breakthrough allowed for the mass production of integrated circuits, and Fairchild Semiconductor Corporation was eventually granted the patent for this fundamental manufacturing technique.1