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Regarding germanium’s electrical behaviour, consider: at absolute zero it acts a

1. Regarding germanium’s electrical behaviour, consider: at absolute zero it acts as an insulator, at room temperature it acts as an intrinsic semiconductor, doped with indium it becomes p-type, and doped with arsenic it becomes n-type. Is this correct?

 

All four hold true: germanium has no free carriers at absolute zero, conducts weakly on its own at room temperature, and becomes p-type or n-type depending on whether it’s doped with trivalent indium or pentavalent arsenic.

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