noun
depletion layer
Technical term in semiconductor physics; refers to the region near a p-n junction where mobile charge carriers are depleted.
トランジスタの空乏層は、電圧をかけると広がる。
The depletion layer of a transistor expands when a voltage is applied.
Compound of 空乏 (kūbō, 'depletion') + 層 (sō, 'layer'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning in semiconductor contexts.