Luminescent solar concentrators (LSCs) can serve as large-area sunlight collectors for terrestrial and space-based photovoltaics. Due to their high emission efficiencies and readily tunable emission and absorption spectra, colloidal quantum dots have emerged as a new and promising type of LSC fluorophore. Spectral tunability of the quantum dots also facilitates the realization of stacked multilayered LSCs, where enhanced performance is obtained through spectral splitting of incident sunlight, as in multijunction photovoltaics. Here, we demonstrate a large-area (>230 cm2) tandem LSC based on two types of nearly reabsorption-free quantum dots spectrally tuned for optimal solar-spectrum splitting. This prototype device exhibits a high optical quantum efficiency of 6.4% for sunlight illumination and solar-to-electrical power conversion efficiency of 3.1%. The efficiency gains due to the tandem architecture over single-layer devices quickly increase with increasing LSC size and can reach more than 100% in structures with window sizes of more than 2,500 cm2.
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This work was supported by the Centre for Advanced Solar Photophysics (CASP), an Energy Frontier Research Centre funded by the US Department of Energy, Office of Science, Basic Energy Sciences. K.W. is a CASP member supported by a LANL Director’s Postdoctoral Fellowship.
The authors declare no competing financial interests.
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Wu, K., Li, H. & Klimov, V.I. Tandem luminescent solar concentrators based on engineered quantum dots. Nature Photon 12, 105–110 (2018). https://doi.org/10.1038/s41566-017-0070-7
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