Physical performance limitations of luminescent down-conversion layers for photovoltaic applications
Physical performance limitations of luminescent down-conversion layers for photovoltaic applications
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DOI：
10.1016/j.solmat.2013.11.005
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发表时间：
2014-03-01
影响因子：
6.9
通讯作者：
Richards, B. S.
中科院分区：
文献类型：
--
作者：
Boccohni, A.;Marques-Hueso, J.;Richards, B. S.
提出了一个光学模型来确定自吸收对下转换(DC)材料发射的发光的限制。推导出了一个解析公式，证明了对于给定的直流材料，存在一个最佳厚度，该厚度最大化发射辐射的强度，同时最小化自吸收的影响。这为受其几何形状控制的DC材料的光学效率定义了新的限制。随后，通过对Ce~(3+)-Yb~(3+)共掺特定下转换硼酸盐玻璃的实验分析，验证了模型的正确性，确定了玻璃的最佳厚度为0.83 mm。该模型阐明了某些材料的理论效率和实验效率之间存在差异的根源。这项工作的结果有助于设计和实施光伏器件的直流层，并为其他光学和光子学领域的直流材料的优化提供了一个框架。(C)2013爱思唯尔B.V.保留所有权利。
An optical model is presented to determine the constraints imparted by self-absorption on the luminescence emitted from down-conversion (DC) materials. An analytical formula was derived demonstrating that, for a given DC material, an optimal thickness exists that maximizes the intensity of the emitted radiation, while minimizing the impact of self-absorption. This defines a new limit for the optical efficiency of a DC material that is governed by its geometry. Subsequently, the model was validated through experimental analysis of a specific down-converting borate glass co-doped with Ce3+-Yb3+, whose optimal thickness has been determined to be 0.83 mm. The model clarifies the origin of the disparity between the theoretical and the experimental efficiencies reported for some materials. The results from this work assist with the design and implementation of DC layers for photovoltaic devices, as well as providing a framework for optimization of DC materials to other fields of optics and photonics. (C) 2013 Elsevier B.V. All rights reserved.