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The highest efficiency solar cells are also excellent optical emitters. Band edge luminescence results when no other loss mechanisms compete with power conversion, allowing an ideal maximum efficiency of 33.7%. Constraining the angular range of emitted light, in order to promote light trapping and photon recycling within the semiconductor, increases this maximum to 45.1%. By analogy, here we show how a strategy for integrating highly luminescent aligned semiconductor rod-shaped nanocrystals (nanorods) into luminescent solar concentrators (LSCs) can also improve light trapping in the design and similarly enhance performance in comparison with conventional LSCs. This efficiency improvement relies on an asymmetry in the angular dependence of emission versus absorption that can be provided by the stokes shift of the radiation remitted by the nanorod. Our analysis predicts efficiency increases even when non-radiative loss is comparable to current GaAs cells and nanorod optical performance is consistent with state-of-the-art synthetic preparations.
Matthew T. Sheldon
"Detailed balance efficiencies for luminescent solar concentrators with aligned semiconductor nanorods (Conference Presentation)", Proc. SPIE 10759, New Concepts in Solar and Thermal Radiation Conversion and Reliability, 107590Z (18 September 2018); https://doi.org/10.1117/12.2323215
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Matthew T. Sheldon, "Detailed balance efficiencies for luminescent solar concentrators with aligned semiconductor nanorods (Conference Presentation)," Proc. SPIE 10759, New Concepts in Solar and Thermal Radiation Conversion and Reliability, 107590Z (18 September 2018); https://doi.org/10.1117/12.2323215