Jean Hoerni

American engineer

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July 16, 2026

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Jean Hoerni was an American engineer and a co-founder of Fairchild Semiconductor Corporation. He is credited with developing the planar manufacturing process for transistors. This process involved creating a protective silicon dioxide layer on the semiconductor, which sealed out contaminants and allowed for more stable and reliable devices. This innovation was crucial for the subsequent development of integrated circuits, where multiple components are fabricated on a single silicon chip. Hoerni's work significantly advanced semiconductor technology, paving the way for smaller, more powerful electronic devices.12

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- Fairchild Semiconductor
  Jean Hoerni, one of the founding engineers, realized that depositing a silicon-oxide film on the silicon wafers from which the transistors were cut would reduce the contamination that had plagued production. Noyce took Hoerni’s development one step further. Noyce realized that it was unnecessary to…
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  Jean Hoerni, one of the founding engineers, realized that depositing a silicon-oxide film on the silicon wafers from which the transistors were cut would reduce the contamination that had plagued production. Noyce took Hoerni’s development one step further. Noyce realized that it was unnecessary to…
  Read More

Robert Noyce
Fairchild Semiconductor Corporation and the integrated circuit
In 1958 Jean Hoerni, another Fairchild Semiconductor founder, engineered a process to place a layer of silicon oxide on top of transistors, sealing out dirt, dust, and other contaminants. For Noyce, Hoerni’s process made a fundamental innovation possible. At that time, Fairchild produced transistors and other elements…
Read More
In 1958 Jean Hoerni, another Fairchild Semiconductor founder, engineered a process to place a layer of silicon oxide on top of transistors, sealing out dirt, dust, and other contaminants. For Noyce, Hoerni’s process made a fundamental innovation possible. At that time, Fairchild produced transistors and other elements…
Read More