a has various meanings in the Governmental & Military category. Discover the full forms, definitions, and usage contexts of a in Governmental & Military.
A dopant material, such as boron, which has fewer outer shell electrons than required in an otherwise balanced crystal structure, providing a hole, which can accept a free electron. Or an impurity in a semicon-ductor that donates a free hole to the valence band. A dopant species that traps electrons, especially with regard to semiconductors.
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