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首页> 外文会议>Photovoltaic Specialists Conference (PVSC), 2011 37th IEEE >Investigation of efficient spectral splitting for concentrator modules using luminescent materials
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Investigation of efficient spectral splitting for concentrator modules using luminescent materials

机译：研究使用发光材料的集中器模块的有效光谱分裂

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One approach to high efficiency photovoltaic (PV) involves the manipulation of the incident radiation spectrum. The idea is to present an optical spectrum to the PV that is well matched to the bandgap of the PV material. Solar thermophotovoltaics (TPV) is one example. Another is the use of optics to spatially separate components of the solar spectrum and direct each toward individual PV cells [1]. Wavelength selective mirrors based on dielectric stacks is one solution, but workable designs based on them do not permit a large number of spectral channels. This study investigates the potential of a new concept for dividing solar radiation into spectral channels using an optical design that (1) is simple, easily manufactured, and extensible to many spectral channels, and (2) does not achieve high geometric concentration. The concept is based on the approach of stacked luminescent solar concentrators (LSCs) for dividing the solar spectrum using fluorophores that are tuned to different spectral bands [2]. However, whereas multicolor LSCs are perform two functions using the same optical component - spectral division and concentration - our concept uses luminescent materials for the sole purpose of spectral splitting. The particular design we investigate uses a cylindrical optical matrix that guides light by total internal reflection. Along the length of this light guide are sections that are doped with a luminescent material - in this case semiconductor nanocrystals (see figure). We find that the optical efficiencies can be quite high (QE >; 90%, PE >; 80%) compared to what one might intuitively expect. Furthermore, when we couple the output to a PV model based on experimental cell performance parameters we find that solar-to-electric conversion could exceed 30% using existing materials. Although this does not exceed what can be achieved by HCPV designs on multijunction epitaxially grown stacks, the concept is easily extensible to an arbitrarily large number of sp- ctral channels. This advantage could be used as a route to many more junctions than other approaches permit. In addition to modeling results, preliminary analysis of engineering challenges is also presented (heat rejection, sensitivity to fluorescence quantum yield, etc).
机译：高效光伏（PV）的一种方法涉及入射辐射光谱的操纵。想法是向PV呈现与PV材料的带隙完全匹配的光谱。太阳能热光伏（TPV）就是一个例子。另一个是使用光学器件在空间上分离太阳光谱的各个分量，并将它们分别引向各个PV电池[1]。基于电介质堆叠的波长选择镜是一种解决方案，但是基于它们的可行设计不允许大量的光谱通道。这项研究调查了使用光学设计将太阳辐射分成光谱通道的新概念的潜力，该光学设计（1）简单，易于制造，并且可扩展到许多光谱通道，并且（2）没有达到很高的几何集中度。该概念基于堆叠式发光太阳能集中器（LSC）的方法，该方法使用已调谐至不同光谱带的荧光团来划分太阳光谱[2]。但是，尽管多色LSC使用相同的光学组件执行两种功能-光谱划分和集中-我们的概念仅将发光材料用于光谱分裂。我们研究的特定设计使用了圆柱形光学矩阵，该矩阵通过全内反射来引导光。沿着该光导的长度分布着掺杂有发光材料的部分-在这种情况下是半导体纳米晶体（见图）。我们发现，与人们的直觉期望相比，光学效率可以很高（QE>; 90％，PE>; 80％）。此外，当我们根据实验性电池性能参数将输出耦合至PV模型时，我们发现使用现有材料的太阳能到电的转化率可能超过30％。尽管这不超过在多结外延生长的堆叠上进行HCPV设计所能达到的目标，但该概念很容易扩展到任意数量的晶格通道。与其他方法相比，此优势可以用作通往更多路口的路线。除了建模结果之外，还介绍了工程挑战的初步分析（散热，对荧光量子产率的敏感性等）。

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