I think 31% is the thermodynamic limit for a single p-n junction, and 86.6 is for an infinite stack of them [0]. I'm not sure whether these limits apply to non

I think 31% is the thermodynamic limit for a single p-n junction, and 86.6 is for an infinite stack of them [0]. I'm not sure whether these limits apply to non-planar geometries. [0]: https://en.m.wikipedia.org/wiki/Thermodynamic_efficiency_limit https://en.m.wikipedia.org/wiki/Thermodynamic_efficiency_lim...