Highly Luminescent Lead-free Cesium Copper Halide Perovskite Nanoplatelets for Luminescent Solar Concentrator Application

Luminescent solar concentrators (LSCs) are light-managing devices capable of absorbing and concentrating solar energy to a specific wavelength range and the target region. By coupling with photovoltaic (PV) cells, a PV-LSC system can significantly reduce the total material consumption for solar panel fabrication and simplify the design of large-scale solar harvesting devices for practical utilization. In particular, halide perovskite nanocrystals have shown promising potential for LSC applications due to their excellent optical properties, such as high photoluminescent quantum yield (PLQY), large Stoke’s shift, and tunable optical bandgaps. Here, we report the fabrication of high-performance luminescent solar concentrator devices using copper halide perovskite nanoplatelets (NPLs). The Cs₃Cu₂Cl₅ perovskite NPLs with high photoluminescence quantum yield (PLQY) and large stock shift are synthesized through a hot-injection method. The NPLs are then deposited onto a polydimethylsiloxane (PDMS) substrate through our recently reported ultrasonic nebulization spray method with a low scattering effect and high average visible transmittance. The obtained LSC devices show a high optical efficiency performance and high-power conversion efficiency for the photons in both UVB and UVC regions, making them an ideal LSC device for capturing and energy conversion of high-energy photons.