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Why did John Bardeen, Walter Brattain, and William Shockley receive the 1956 Nobel Prize in Physics?

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NMOS transistorNegative-channel metal-oxide semiconductors (NMOS) employ a positive secondary voltage to switch a shallow layer of p-type semiconductor material below the gate into n-type. For positive-channel metal-oxide semiconductors (PMOS), all these polarities are reversed. NMOS transistors are more expensive, but faster, than PMOS transistors. — transistor NMOS transistor
Negative-channel metal-oxide semiconductors (NMOS) employ a positive secondary voltage to switch a shallow layer of p-type semiconductor material below the gate into n-type. For positive-channel metal-oxide semiconductors (PMOS), all these polarities are reversed. NMOS transistors are more expensive, but faster, than PMOS transistors.

John Bardeen, Walter Brattain, and William Shockley were awarded the 1956 Nobel Prize in Physics for their joint invention of the transistor.12

Working at Bell Labs, the three physicists conducted research on the electron-conducting properties of semiconductors. In December 1947, Bardeen and Brattain invented the first successful semiconductor amplifier, known as the point-contact transistor, after discovering how to neutralize "surface-state" electrons that had previously hindered their research. Shortly thereafter, in January 1948, Shockley conceived the junction transistor, a more manufacturable design that utilized a three-layer "sandwich" of semiconductor material.21

This breakthrough technology replaced bulky vacuum tubes and provided the foundation for the miniaturization of electronic components, effectively ushering in the modern electronic revolution.2