When the temperature of a pure semiconductor is raised, its resistance

(A) decreases, because more electron–hole pairs are produced. Heating gives more valence electrons enough energy to cross the band gap, so the number of free electrons and holes rises sharply. This outweighs the small fall in mobility, so resistance decreases: semiconductors have a negative temperature coefficient of resistance.

When the temperature of a pure semiconductor is raised,… | Semiconductor Electronics

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