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Use band theory to explain why the electrical resistance of the sample falls as the temperature of the semiconductor material increases.
Physics 9702 · AS & A Level · Energy levels in atoms and line spectra
Energy levels in atoms and line spectra — practice question
Fig. 10.1 shows some of the electron energy bands in a semiconductor at absolute zero temperature.
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This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “any five points explaining why a semiconductor’s resistance decreases as temperature rises (electrons gain energy, move into the conduction band, holes are formed, more carriers)” …
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