Understanding of polysilicon carriers
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In physics, carriers refer to charged particles of matter that can move freely, such as electrons and ions. In semiconductor physics, the vacancies (holes) left in covalent bonds due to the loss of electrons are considered carriers. In metals, it is electrons; in semiconductors, there are two types of charge carriers: electrons and holes. Charged particles that can move in a directed manner under the influence of an electric field. Such as free electrons and holes in semiconductors, free electrons in conductors, positive and negative ions in electrolytes, ions in discharged gases, etc.
That’s right; the term \"minority carriers\" refers to semiconductor materials, not polysilicon. Moreover, minority carriers are defined in relation to majority carriers. For example, in P-type semiconductors, conduction relies on holes; since the \"concentration\" of holes is high, free electrons are the minority carriers while holes are the majority carriers ； In contrast, in N-type semiconductors, conduction relies on free electrons; since the \"concentration\" of free electrons is high, holes are considered minority carriers while free electrons are the majority carriers.