Semiconductor doping and liquid-propellant rocket engine: what they have in common

1. Step 1. Semiconductor doping — is used in — P–n junction. p- and n-regions are created by doping.
2. Step 2. P–n junction — is used in — Photodiode. Light generates a current in the p–n junction.
3. Step 3. Photodiode — is part of — Infrared seeker. A photodetector.
4. Step 4. Infrared seeker — is part of — Guided missile. A seeker.
5. Step 5. Guided missile — evolved from — Rocket. A rocket with guidance.
6. Step 6. Rocket — evolved into — Liquid-propellant rocket engine. Goddard switched to liquid fuel.

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