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Summary of <strong>Chapter</strong> <strong>29</strong>• Electron energy levels in crystals become b<strong>and</strong>s ofallowed states, with gaps in the b<strong>and</strong>s.• Metal highest occupied b<strong>and</strong> is only partially full• Insulator the highest occupied b<strong>and</strong> is totally full,<strong>and</strong> there is a large gap to the next b<strong>and</strong>• Semiconductors the highest b<strong>and</strong> is also full, butthe energy gap is fairly small• Doped semiconductors small amounts of dopingallow conductivity to be very precisely controlled; canbe ntype (dopant is ‘donor’) or ptype (or ‘acceptor’)
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