The Shockley-Queisser Limit and Its Discontents
In 1961, Shockley and Queisser proved that single-junction solar cells cannot be more than ~34% efficient, under certain assumptions. Many researchers have viewed this theoretical efficiency limit as a challenge to overcome, and have proposed a dizzying variety of techniques to surpass that limit: multijunctions, concentration, multi-exciton generation, intermediate bands, hot electrons, upconversion, downconversion, anisotropic re-radiation, etc.
In the first part of the talk, Dr. Byrnes will give a tutorial on the Shockley-Queisser limit, explaining the steps and assumptions. Then, for each of those limit-surpassing techniques, he will explain how it works, why it can (in principle) beat the S-Q limit, and whether he thinks it is promising for real-world solar cells.
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