Fundamental limits of concentration in luminescent solar concentrators revised: the effect of reabsorption and nonunity quantum yield
Fundamental limits of concentration in luminescent solar concentrators revised: the effect of reabsorption and nonunity quantum yield
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DOI：
10.1364/optica.2.000841
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发表时间：
2015-10-20
期刊：
影响因子：
10.4
通讯作者：
Tummeltshammer, Clemens
中科院分区：
文献类型：
--
作者：
Papakonstantinou, Ioannis;Tummeltshammer, Clemens
发光太阳能聚光器（LSC）理论上能够以极高的效率将直接和漫射太阳辐射聚集到薄介电层中。过去开发了一种基于热力学原理的理论，用于估计 LSC 可以实现的浓度限制，并促进研究人员预测其设计将光能转换为电能的潜力。然而，虽然该模型支持数千甚至数万个太阳的聚光效率，但实验中仅记录了其中一小部分的值。这是因为在热力学极限的计算中，假设发光体的量子产率等于1，并且完全忽略任何猝灭捕获场强度的过程。为了更好地将理论与现实相匹配并提供更准确的性能估计，我们基于统计光学框架修改了浓度限制。新模型深入了解了抑制 LSC 浓度的主要机制，可用于提取高效 LSC 的设计规则。本文提出的方法与蒙特卡罗光线追踪模拟获得的结果之间的比较表明两者之间具有极好的一致性。最后，我们讨论了热力学极限的有效性条件，并表明在某些情况下这些条件实际上是可以被超越的。 (C) 2015年美国光学学会
Luminescent solar concentrators (LSCs) are devices theoretically able to condense both direct and diffuse solar radiation into thin dielectric layers with extremely high efficiencies. A theory based on thermodynamic principles was developed in the past to estimate the concentration limits that can be achieved with an LSC and facilitate researchers' efforts to predict the potential of their designs to convert optical to electrical power. However, while concentration efficiencies of thousands or even tens of thousands of suns are supported by this model, values of only a fraction of those have ever been recorded experimentally. This is because in the calculation of the thermodynamic limits the quantum yield of the luminophores is assumed to be equal to unity and any processes that quench the intensity of the trapped field are completely ignored. In an attempt to better match theory with reality and provide more accurate performance estimates, we have revised the limits of concentration based on a statistical optics framework. The new model gives insight into the main mechanisms inhibiting the concentration of LSCs and can be used to extract design rules for efficient LSCs. Comparisons between the method presented in this paper and results obtained with Monte Carlo ray-tracing simulations demonstrate excellent agreement between the two. Finally, we discuss the conditions for validity of the thermodynamic limits, and we show that in some circumstances these can actually be surpassed. (C) 2015 Optical Society of America