Luminescent solar concentrators (LSCs) enable large-area collection of sunlight relevant to building-integrated photovoltaics. Reduced-dimensional metal halide perovskite nanoplatelets (PNPLs) have recently emerged as candidates for low-loss large-area LSCs due to the optoelectronic properties of perovskites combined with the large Stokes shift attainable using the multiple quantum well (MQW) structure. LSCs using bromine-based PNPLs have been demonstrated; however, the band gaps of bromine-based perovskites limit the absorption range. Iodine-based PNPLs allow broader absorption, but emission can be achieved only if the chemistry of PbI_x^2−x precursor complexes is engineered to provide the appropriate MQW distribution. Here, by controlling the polarity and Lewis basicity of the precursor solution, we modify the solvent-Pb²⁺ coordination and synthesize PNPLs having a uniform MQW distribution. This improves energy funneling, enabling a film PLQY (photoluminescence quantum yield) of 56% and 10 × 10 cm LSCs with an optical conversion efficiency of 2.0%, a 1.3-fold enhancement compared to the best previously reported room-temperature-fabricated perovskite LSCs.

发光太阳能集中器（LSC）可以大面积收集与建筑物集成光伏相关的太阳光。由于钙钛矿的光电特性以及使用多量子阱（MQW）结构可获得的大斯托克斯位移，降低尺寸的金属卤化物钙钛矿纳米片（PNPL）成为低损耗大面积LSC的候选者。使用溴基PNPL的LSC已被证明；然而，溴基钙钛矿的带隙限制了吸收范围。基于碘的PNPL允许更广泛的吸收，但只有在PbI _x ^2-x的化学性质下才能实现发射设计前体配合物以提供适当的MQW分布。在这里，通过控制前体溶液的极性和Lewis碱度，我们可以修改溶剂-Pb ²⁺配位并合成具有均匀MQW分布的PNPL。这改善了能量漏斗，使膜PLQY（光致发光量子产率）达到56％，光散射效率为2.0％，与10×10 cm LSC相比，与先前报道的最佳室温加工钙钛矿LSC相比，提高了1.3倍。