Explain about the intrinsic breakdown, Chemistry

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Explain about the Intrinsic breakdown:

It's because of the excitation of electrons into the conduction band across the energy gap under the condition of excessive voltage. Excited electrons can excite more electrons in turns, resulting in an avalanche of conducting electrons. Impurities in the dielectric can create additional energy levels which lie in the energy gap and can help in excitation of electrons into the conduction band.

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