Solar energy enhancement using down-converting particles: A rigorous approach
Solar energy enhancement using down-converting particles: A rigorous approach
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DOI：
10.1063/1.3592297
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发表时间：
2011-06-01
影响因子：
3.2
通讯作者：
Zhang, Xiang
中科院分区：
文献类型：
--
作者：
Abrams, Ze'ev R.;Niv, Avi;Zhang, Xiang
单带隙太阳能电池的效率由肖克利-奎瑟极限指定，其将最大输出功率定义为太阳能电池的带隙的函数。克服这种限制的一种方法是通过使用下转换过程，其中高能量光子被分裂成两个较低能量光子，从而增加电池的电流。在这里，我们提供了一个全面的分析，当放置在一个预先存在的太阳能电池顶部的降频转换材料的可能的效率提高。我们表明，一个完全有效的降频转换材料的总效率提高7%是可能的。我们的分析涵盖了无损和有损的理论极限，以及热力学评估。最后，我们描述了纳米颗粒作为降频转换材料的可能选择的优点。(C)2011年美国物理学会。[doi：10.1063/1.3592297]
The efficiency of a single band-gap solar cell is specified by the Shockley-Queisser limit, which defines the maximal output power as a function of the solar cell's band-gap. One way to overcome this limit is by using a down-conversion process whereupon a high energy photon is split into two lower energy photons, thereby increasing the current of the cell. Here, we provide a full analysis of the possible efficiency increase when placing a down-converting material on top of a pre-existing solar cell. We show that a total 7% efficiency improvement is possible for a perfectly efficient down-converting material. Our analysis covers both lossless and lossy theoretical limits, as well as a thermodynamic evaluation. Finally, we describe the advantages of nanoparticles as a possible choice for a down-converting material. (C) 2011 American Institute of Physics. [doi:10.1063/1.3592297]