Fundamental losses in solar cells

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Quantifying Losses in Open-Circuit Voltage in Solution-Processable Solar Cells (2015, background): “Thus, by calculating absorption and emission due to radiative recombination, it is possible to determine the maximum open-circuit voltage VOC;SQ of an idealized device absorbing all light above a certain band-gap energy [2,3].”
Solution-Processed All-Perovskite Multi-Junction Solar Cells (2019, background): “5%.[18] By reducing the difference between the photon energy and the electronic band gap energy, we can effectively minimize chargecarrier thermalisation losses.”
Photovoltaic solar cell technologies: analysing the state of the art (2019, unknown): “∣ ∣ ( ) qV E η = 0 941 − 0 181+0 0257 ln( ) eV (7) OC g ext”
Solar thermophotovoltaics: reshaping the solar spectrum (2016, background): “Various losses may occur, reducing the performance of the PV system; among them, typically sub-band gap and thermalization losses dominate [116].”
Strong Internal and External Luminescence as Solar Cells Approach the Shockley–Queisser Limit (2011, background): “A maximally concentrating solar cell would emit photons only directly back to the sun, thus achieving even higher voltages [16], [17].”