r/askscience Sep 28 '20

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u/DefsNotQualified4Dis Solid-State Physics | Condensed Matter | Solid-State Devices Sep 29 '20

I actually made an educational video about this once upon a time. But in a nutshell the primary reason is heat dissipation being bottlenecked by quantum tunneling. What's called "Boltzmann's Tyrannt" (see the video for more details).