A highly efficient luminescent solar concentrator (LSC) composed of a nanosized metal-cluster as a molecular luminophore copolymerized with poly(methyl methacrylate) (PMMA) was fabricated through a simple solution process. Organic-inorganic salts such as (dMDAEMA)2[Mo6Cl14] and (dMDAEMA)2[Mo6I14] (where dMDAEMA is 2-(methacryloyloxy)ethyl dimethyldodecylammonium) were copolymerized with PMMA to generate a highly effective, transparent, and robust LSC waveguide. This hybrid luminophore enabled the development of a highly efficient UV-vis sunlight harvesting device due to strong absorption at UV-vis wavelengths up to ∼500 nm and a large downshift of luminescence at near-infrared wavelengths (∼850 nm). Si photovoltaic cells were placed at the edge of the LSC waveguide plate to collect the concentrated luminescence by internal reflection. LSCs fabricated with a 2.0 × 2.0 × 0.3 mm3 size had the highest observed power conversion efficiency (PCE) of 1.24% and a transparency of ∼85%, which were much higher than those of LSCs made from other luminophores with the same Si photovoltaic cell. Our LSC with chemical/physical durability, robustness, and solution processability for any desirable plate size and thickness suggests a practical future direction for smart windows of urban buildings where traditional Si photovoltaic cells cannot be directly employed.
Bibliographical noteFunding Information:
This research was supported by the Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2015M1A2A2058362). This work was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2021R1A6A1A10039823). We also gratefully acknowledge Prof. Youngmin You and Prof. Jaehong Park for valuable discussions on the PLQY measurement.
© 2022 The Royal Society of Chemistry.