Highly Soluble Copper(I)-Iodide Cluster-Based Hybrids\nfor High-Efficiency Luminescent Solar Concentrators

Luminescent\nsolar concentrators (LSCs) are promising large-scale\nsunlight collectors for photovoltaics due to their affordability and\nsuitability for building-integrated photovoltaics (BIPVs). However,\nthe low photoluminescent efficiency, narrow Stokes shift, and poor\nprocessability of most luminescent materials restrain the performance\nof the fabricated transparent LSCs. This work reports a copper-iodide\n(Cu–I) cluster-based luminescent hybrid for high-performance\nLSCs. This C<sub>114</sub>H<sub>103</sub>Cu<sub>4</sub>I<sub>4</sub>N<sub>2</sub>O<sub>2</sub>P<sub>6</sub> (abbreviated as <b>CuI-1</b>) hybrid with the ethoxy solubilizing groups shows a significant\nStokes shift of 219 nm, high photoluminescence quantum yield (PLQY)\nof 97.9%, and excellent solubility in polar organic solvents. We fabricated\nthe transparent <b>CuI-1</b>/PVP-based LSCs via facile doctor\nblade coating, which achieves a η<sub>opt</sub> of 5.89% and\na η<sub>PCE</sub> of 3.04%. In addition, we developed a series\nof Cu–I cluster hybrids by ligand modification for LSCs, which\nall display excellent optical properties for LSCs. Our results show\nthe potential of Cu–I cluster-based hybrids for high-performance\nLSCs in BIPV systems.