Abstract. Luminescent solar concentrators (LSCs) have been studied for decades as an alternative to conventional lens-based optical concentrators for improving the performance and lowering the cost of high-efficiency photovoltaic solar converters. However, the Stokes shift from luminophores that comprise the LSC entails that the strategy cannot achieve the well-known Shockley–Queisser conversion efficiency limit of 33.7%, even theoretically. We show how aligned semiconductor nanorods with anisotropic dipolar photoluminescence can partially overcome losses due to the Stokes shift. We also outline LSC designs with conversion efficiency >33.7 % and highlight how nanorods relax the demands on solar trackers in these proposals. Our analysis predicts efficiency increases even when nonradiative loss is comparable to current GaAs cells and when our models incorporate the experimentally measured anisotropy of colloidal dot-in-rod CdSe/CdS nanoparticles that we synthesized for this study. Fundamentally, these improvements result from the angular redistribution of light energy provided by the anisotropic, Stokes-shifted nanorod luminescence.

中文翻译：

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具有对齐半导体纳米棒的发光太阳能聚光器的详细平衡效率：各向异性发射的好处

摘要。几十年来，人们一直在研究发光太阳能聚光器 (LSC) 作为传统基于透镜的光学聚光器的替代品，以提高高效光伏太阳能转换器的性能并降低其成本。然而，从构成 LSC 的发光体的斯托克斯转变意味着该策略无法达到众所周知的 33.7% 的肖克利-奎瑟转换效率极限，即使在理论上也是如此。我们展示了具有各向异性偶极光致发光的对齐半导体纳米棒如何部分克服斯托克斯位移造成的损失。我们还概述了转换效率 >33.7% 的 LSC 设计，并强调了纳米棒如何在这些提案中放宽对太阳能跟踪器的要求。我们的分析预测，即使非辐射损耗与当前的 GaAs 电池相当，并且当我们的模型包含我们为本研究合成的胶体棒状 CdSe/CdS 纳米粒子的实验测量各向异性时，效率也会提高。从根本上说，这些改进源于各向异性、斯托克斯位移纳米棒发光提供的光能的角度重新分布。