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Have a look at the Wikipedia article on Solar cell efficiency. The efficiency is the electrical power output divided by the total energy received across all wavelengths. As you say, this would be unlikely ever to reach 100% as some of the energy is at long wavelengths.


They talk about contact voltages because it affects “stop voltage” as measured by their instruments, but it doesn’t affect $\Delta U_{\rm stop} / \Delta\nu$ since aforementioned contact voltages are assumed independent of illumination conditions. Because a photovoltaic cell made of a homogeneous piece of material won’t work. A piece of conductor will not ...

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