Photoluminescent and electroluminescent couplings in monolithic tandem solar cells
Photoluminescent and electroluminescent couplings in monolithic tandem solar cells
复制标题
单片串联太阳能电池中的光致发光和电致发光耦合
DOI：
10.1002/pip.2750
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
M. Green
中科院分区：
文献类型：
--
作者：
Dongchen Lan;M. Green
随着太阳能电池效率的提高，电池的辐射效率也在提高。在高性能串联堆叠中，每个单独的电池在工作过程中都会发出显著的发光，这使得这些电池之间的辐射耦合成为电池设计、测量和性能预测中需要考虑的重要因素。过去的建模只包括电致发光耦合组件，尽管光致发光耦合对于在其最大功率点电压附近或低于其最大功率点电压或结缺陷重组占主导地位的电池可能很重要。在这项工作中，我们首先提出了早期模型的扩展，以允许包括这种不可忽略的耦合成分，这是通过测量密切相关的外部发射来验证的。然后，我们建立了一个等效电路，并独特地利用直观的电路概念进行了全面的分析，阐明了寄生电路元件和外部负载在细胞之间复杂的辐射相互作用中的作用。电路分析还揭示了一些未被发现的问题，在消除耦合效应的测量细胞的光谱响应。版权所有©2016 John Wiley & Sons， Ltd。
As solar cell efficiency improves, so does the cell's radiative efficiency. In high‐performance tandem stacks, each individual cell emits significant luminescence during operation, making radiative coupling between these cells an important factor to consider in cell design, measurement and performance prediction. Past modelling includes the electroluminescent coupling component only, although photoluminescent coupling is likely to be important for cells operating near or below their maximum power point voltage or when junction defect recombination is dominant. In this work, we first propose an extension of earlier models to allow this non‐negligible coupling component to be included, which is validated by measurement of the closely related external emission. Then, we establish an equivalent circuit and uniquely use intuitive circuit concepts to conduct a comprehensive analysis clarifying the roles of parasitic circuit elements and external loads in the complex radiative interactions between cells. The circuit analysis also reveals some undiscovered issues to be addressed in eliminating coupling effects from measured cell spectral responses. Copyright © 2016 John Wiley & Sons, Ltd.