Quantum Dot–Block Copolymer Hybrids for Low Scattering Luminescent Solar Concentrators
Quantum Dot–Block Copolymer Hybrids for Low Scattering Luminescent Solar Concentrators
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DOI：
10.1021/acsapm.1c01837
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发表时间：
2022-04
影响因子：
5
通讯作者：
K. Koch;Daniel Korus;J. Doyle;M. Plummer;Meredith Boxx;H. Win-Piazza;S. McDowall;D. Patrick;D. Rider
中科院分区：
文献类型：
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作者：
K. Koch;Daniel Korus;J. Doyle;M. Plummer;Meredith Boxx;H. Win-Piazza;S. McDowall;D. Patrick;D. Rider
发光太阳能集中器(LSC)使用嵌入在透明波导中的下转换荧光粉来吸收阳光，通过全内反射捕获发光光子，并提供高辐照度、窄带输出光，以驱动光伏、光化学和其他太阳能转换器。基于量子点(QD)的LSC通常受到几种光学损耗机制的影响，包括在传输到聚光器边缘的过程中通过QD聚集体的散射而损失一部分导光。尽管最近推出的用于LSC应用的大有效斯托克斯位移量子点发光团已经帮助解决了与前几代有机和无机染料相关的几个缺点，包括改善了太阳光谱匹配、光稳定性和光致发光量子产率，但在商业部署的聚合物(如聚甲基丙烯酸甲酯(PMMA))中实现技术上相关的量子点负载的低光散射仍然具有挑战性。在这里，我们研究了应用含有与LSC基质组成相匹配的聚合物配体的量子点来减少聚集以及由此引起的由散射引起的寄生波导损耗的概念。报道了一种硫醇封端的PMMA配体的合成、表征及其与二硫化铜/硫化锌(CIS/ZnS)量子点的配体交换反应。然后，将带有PMMA配体的量子点用作嵌入PMMA波导的下转换荧光粉。结果发现，由于器件中聚集的减少，所得到的基于量子点的LSC具有较低的光学散射和较高的负载。
Luminescent solar concentrators (LSCs) use down-converting phosphors embedded in a transparent waveguide to absorb sunlight, trap luminescent photons by total internal reflection, and deliver high irradiance, narrowband output light for driving photovoltaic, photochemical, and other solar energy converters. Quantum-dot-based (QD) LSCs are typically affected by several optical loss mechanisms including the loss of a fraction of guided light during transport to the concentrator edges through scattering from QD aggregates. Although the recent introduction of large effective Stokes shift QD luminophores for LSC applications has helped address several shortcomings associated with previous generations of organic and inorganic dyes, including improved solar spectrum matching, photostability, and photoluminescence quantum yield, achieving low light scattering at technologically relevant QD loadings in commercially deployed polymers such as poly(methyl methacrylate) (PMMA) remains challenging. Herein, we study the concept of applying QDs bearing polymer ligands matching the composition of the LSC matrix to reduce aggregation and the resulting parasitic waveguide losses caused by scattering. We report the synthesis and characterization of a thiol-terminated PMMA-based ligand and its successful ligand exchange reaction with copper indium disulfide/zinc sulfide (CIS/ZnS) QDs. QDs bearing PMMA ligands are then applied as down-converting phosphors embedded in a PMMA waveguide. The resulting QD-based LSCs were found to have lower optical scattering with higher loading as a result of reduced aggregation in the devices.