Lead-Free\nPerovskite Cs<sub>2</sub>Ag<sub><i>x</i></sub>Na<sub>1–<i>x</i></sub>Bi<sub><i>y</i></sub>In<sub>1–<i>y</i></sub>Cl<sub>6<

In\nrecent years, luminescent solar concentrators (LSCs) have gained\na renaissance as a pivotal transparent photovoltaic (PV) for building-integrated\nphotovoltaics (BIPVs). However, most of the studies focused on light-selective\nLSCs, and less attention was paid to the utilization of the full solar\nspectrum. In this study, a lead-free microcrystal Cs<sub>2</sub>Ag<sub><i>x</i></sub>Na<sub>1–<i>x</i></sub>Bi<sub><i>y</i></sub>In<sub>1–<i>y</i></sub>Cl<sub>6</sub> (CANBIC) perovskite phosphor is demonstrated to have bifunctional\neffects of luminescent down-shifting (LDS) and light scattering for\nthe fabrication of LSCs, realizing light response from ultraviolet\n(UV) to NIR regions by an edge-mounted Si solar cell. The optimized\nCANBIC content (30 mg) in an LSC realizes the best optical efficiency\n(η<sub>opt</sub>) of 5.40% and an average visible transmission\n(AVT) of >50%. This contributes to the improvement in short circuit\ncurrent density (<i>J</i><sub>SC</sub>) up to 1.232 mA/cm<sup>2</sup> for the LSC–PV system (one-edge mounted Si solar cell)\nas a result of the best power conversion efficiencies (PCEs) of 0.463%\nand 1.852% for the LSC–PV and LSC–4PV systems (four-edge\nmounted Si solar cells), respectively. An Al foil is applied as a\nreflection background in the LSC–4PV system, and a champion\nPCE of 3.14% is realized due to an improved <i>J</i><sub>SC</sub> of up to 7.94 mA/cm<sup>2</sup> in total. Furthermore, the\nLSC maintains superior stability under exposure to continuous ultraviolet\nillumination or in ambient air.