Schottky diode vs Shockley diode?
Walter H Schottky was a physicist, wikipedia He did much work around emission of electrons from surfaces, which led to the metal-semiconductor junction being named after him.

William Schockley was an engineer, mainly at Bell Labs. wikipedia. His work on the junction diode included the Schockley equation, which relates current to an exponential of voltage. $$ I=I_S(e^\frac{V_D}{nV_T}-1)$$

Many people confuse the two. I can't think why.