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The internal physics of a solar cell changes as it approaches the fundamental Shockley-Queisser limit. Photonic considerations overtake electronic ones, as an intense internal and external luminescence requires careful photon management. Counter-intuitively, maximizing light extraction increases voltage and therefore efficiency. Until 2010 the one-sun, single-junction efficiency record was set by...
As solar cells exceed 25% efficiency, photon management becomes far more important than electronic properties. Surprisingly, maximizing external fluorescence increases efficiency, the key behind the recent single-junction efficiency record of 28.4%.
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