Abstract: Luminescent solar concentrators (LSCs) have the potential to be integrated into buildings, which can serve as distributed energy generation units and achieve a high concentrating ratio without the traditional cooling and tracing systems. Colloidal quantum dots (QDs) are promising candidates as emissive chromophores in LSCs, but self-absorption loss is still a hindrance to the enhancement of the efficiency of QD-LSCs. CH3NH3PbI3 perovskite QDs were synthesized by ligand-assisted reprecipitation (LARP) technique that is low cost and convenient for scale-up fabrications. CH3NH3PbI3 perovskite QD solution was used to fabricate a relatively large size LSC with a dimension of 78 mm×78 mm×7 mm. By optimizing synthesis of CH3NH3PbI3 perovskite QDs, absorption and emission spectra were tuned to minimize the overlap, thus reducing self-absorption losses in waveguide transmission. Thanks to the suppressed reabsorption, the LSC with a dimension of 78 mm×78 mm×7 mm fabricated from CH3NH3PbI3 perovskite QDs exhibited an optical efficiency as high as 24.5% and a power conversion efficiency of 3.4%. It shows that CH3NH3PbI3 perovskite QDs as suitable emitters could be excellent candidates for efficient large-area LSCs in future building-integrated photovoltaics.

Key words: luminescent solar concentrator, perovskite, quantum dot, self-absorption, building-integrated photovoltaics