Department of Engineering and Natural Sciences , Sabanci University , Istanbul 34956 , Turkey.
ACS Appl Mater Interfaces. 2018 Apr 18;10(15):12975-12982. doi: 10.1021/acsami.7b19144. Epub 2018 Apr 5.
Luminescent solar concentrators (LSCs) show promise because of their potential for low-cost, large-area, and high-efficiency energy harvesting. Stokes shift engineering of luminescent quantum dots (QDs) is a favorable approach to suppress reabsorption losses in LSCs; however, the use of highly toxic heavy metals in QDs constitutes a serious concern for environmental sustainability. Here, we report LSCs based on cadmium-free InP/ZnO core/shell QDs with type-II band alignment that allow for the suppression of reabsorption by Stokes shift engineering. The spectral emission and absorption overlap was controlled by the growth of a ZnO shell on an InP core. At the same time, the ZnO layer also facilitates the photostability of the QDs within the host matrix. We analyzed the optical performance of indium-based LSCs and identified the optical efficiency as 1.45%. The transparency, flexibility, and cadmium-free content of the LSCs hold promise for solar window applications.
发光太阳能集中器 (LSCs) 具有低成本、大面积和高效率能量收集的潜力，因此备受关注。通过对荧光量子点 (QD) 的斯托克斯频移工程进行设计，可以抑制 LSCs 中的再吸收损耗；然而，QD 中使用的高毒性重金属对环境可持续性构成了严重的担忧。在此，我们报告了基于无镉 InP/ZnO 核/壳 QD 的 LSCs，这些 QD 具有 II 型能带排列，可通过斯托克斯频移工程抑制再吸收。通过在 InP 核上生长 ZnO 壳来控制光谱发射和吸收的重叠。同时，ZnO 层还可以提高 QD 在主体基质中的光稳定性。我们分析了基于铟的 LSCs 的光学性能，并确定其光学效率为 1.45%。LSCs 的透明度、柔韧性和无镉含量有望应用于太阳能窗。
