Studying the semiconductor in equilibrium, i found a sentence which i don't understand.(adsbygoogle = window.adsbygoogle || []).push({});

"At the very low temperature, freeze-out occurs;the Boltzmann approximation is no longer valid."

I know that freeze-out occurs at the very low temperature, but why is it that the Boltzmann approximation is no longer valid?

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# Boltzmann approximation!

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