Semiconductors are just insulators with a small forbidden band gap, if they are “intrinsic” superconductors with NO impurities, or “extrinsic” with impurities giving states with energies in the forbidden band:

• Semiconductors are just insulators with a small forbidden band gap, if they are “intrinsic” superconductors with NO impurities, or “extrinsic” with impurities giving states with energies in the forbidden band:

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