Which risk increases when a thermoelectric generator's hot-side temperature exceeds the maximum design limit?

💡 Explanation

When the hot-side temperature exceeds the design limit, material degradation mechanisms, such as diffusion and phase changes, are accelerated in thermoelectric materials, leading to thermal property changes that promote thermal runaway. Therefore material degradation accelerating thermal runaway is the highest risk, rather than decreased conductivity or Seebeck coefficient instability, which are less direct consequences.

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