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  • Title: Quantum-Cutting Luminescent Solar Concentrators Using Ytterbium-Doped Perovskite Nanocrystals.
    Author: Luo X, Ding T, Liu X, Liu Y, Wu K.
    Journal: Nano Lett; 2019 Jan 09; 19(1):338-341. PubMed ID: 30525678.
    Abstract:
    We introduce and demonstrate the concept of quantum-cutting luminescent solar concentrators (QC-LSCs) using Yb3+-doped perovskite nanocrystals. These NCs feature a photoluminescence quantum yield approaching 200% and virtually zero self-absorption loss of PL photons, defining a new upper limit of 150% for the internal optical efficiency (ηint) of LSCs that is almost independent of LSC sizes. An un-optimized 25 cm2 QC-LSC fabricated from Yb3+-doped CsPbCl3 NCs already displayed an ηint of 118.1 ± 6.7% that is 2-fold higher than previous records using Mn2+-doped quantum dots (QDs). If using CsPbCl xBr3- x NCs capable of absorbing ∼7.6% of solar photons, the projected external optical efficiency (ηext) of QC-LSCs can exceed 10% for >100 cm2 devices, which still remains a challenge in the field. The advantage of QC-LSCs over conventional QD-LSCs becomes especially obvious with increasing LSC sizes, which is predicted to exhibit a more than 4-fold efficiency enhancement in the case of window-size (1 m2) devices.
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