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Performance analysis of rigorous coupled-wave analysis and its integration in a coupled modeling approach for optical simulation of complete heterojunction silicon solar cells

机译：完整异质结硅太阳能电池光学仿真耦合建模方法的严格耦合波分析性能分析及其集成

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A variety of light management structures have been introduced in solar cells to improve light harvesting and further boost their conversion efficiency. Reliable and accurate simulation tools are required to design and optimize the individual structures and complete devices. In the first part of this paper, we analyze the performance of rigorous coupled-wave analysis (RCWA) for accurate three-dimensional optical simulation of solar cells, in particular heterojunction silicon (HJ Si) solar cells. The structure of HJ Si solar cells consists of thin and thick layers, and additionally, micro- and nano-textures are also introduced to further exploit the potential of light trapping. The RCWA was tested on the front substructure of the solar cell, including the texture, thin passivation and contact layers. Inverted pyramidal textures of different sizes were included in the simulations. The simulations rapidly converge as long as the textures are small (in the (sub)micrometer range), while for larger microscale textures (feature sizes of a few micrometers), this is not the case. Small textures were optimized to decrease the reflectance, and consequently, increase the absorption in the active layers of the solar cell. Decreasing the flat parts of the texture was shown to improve performance. For simulations of structures with microtextures, and for simulations of complete HJ Si cells, we propose a coupled modeling approach (CMA), where the RCWA is coupled with raytracing and the transfer matrix method. By means of CMA and nanotexture optimization, we show the possible benefits of nanotextures at the front interface of HJ Si solar cells, demonstrating a 13.4% improvement in the short-circuit current density with respect to the flat cell and 1.4% with respect to the cell with double-sided random micropyramids. We additionally demonstrate the ability to simulate a combination of nano- and microtextures at a single interface, although the considered structure did not show an improvement over the pyramidal textures.
机译：在太阳能电池中引入了各种光管理结构，以改善光收获，进一步提高其转换效率。需要可靠和准确的仿真工具来设计和优化各个结构和完整的设备。在本文的第一部分，我们分析了严格耦合波分析（RCWA）的性能，用于太阳能电池的精确三维光学仿真，特别是异质结硅（HJ Si）太阳能电池。 HJ Si太阳能电池的结构由薄且厚的层组成，另外，还引入了微型和纳米纹理以进一步利用光捕获的潜力。 RCWA在太阳能电池的前部结构上进行了测试，包括纹理，薄钝化和接触层。模拟中包含不同尺寸的倒置金字塔纹理。只要纹理很小（在（子）微米范围内），模拟迅速会聚，而对于较大的微观纹理（特征尺寸为几微米），则这不是这种情况。优化小纹理以降低反射率，因此，增加太阳能电池的有源层的吸收。显示纹理的平坦部分的降低以提高性能。对于具有微织物的结构的模拟，以及用于完整的HJ SI细胞的仿真，我们提出了一种耦合建模方法（CMA），其中RCWA与光线跟踪和传递矩阵法耦合。通过CMA和纳米纹理优化，我们在HJ SI太阳能电池的前界面处展示了纳米纹理的可能益处，展示了相对于扁平电池的短路电流密度的提高13.4％，相对于扁平电池和1.4％具有双面随机微嘧啶的细胞。我们还展示了在单个界面处模拟纳米和微节块组合的能力，尽管所考虑的结构没有显示出锥形纹理的改善。

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