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> How does diamond fit into this 'insulator not= large gapsemiconductor'
It is the canonical example of a large-gap semiconductor.
A rather large temperature would be required for diamond to carry an 'injected' charge wouldn't it?
No.
That's just the point. Temperature has got nothing to do with
the motion of /injected/ charge. Once an electron has been injected
into the conduction band, it moves as freely as it would move
through a vacuum.
Temperature has everything to do with the spontaneous production
of non-injected charge, but nothing to do with /injected/ charge.