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solar cells generate heat from the waste energy not absorbed. an infrared QDSC would be designed to absorb and convert IR to electicity, not heat.

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Correct me if I'm wrong, but as I understand it, it's not just IR that results in energy wasted as heat in conventional solar panels, but also the high energy photons (i.e. blues) that have many times the energy needed to knock off a single electron and the balance of the energy is thermalized whereas QDs can produce multiple electrons and little or no energy wasted as heat.