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Circular Nanocavity in Ultrathin c-Si Solar Cell for Efficient Light Absorption

机译：超薄C-Si太阳能电池中的圆形纳米岩，高效光吸收

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摘要

In this work, the effect of circular nanocavity on light trapping in a c-Si solar cell was studied by finite difference time domain (FDTD) simulation. The structure of the solar cell was considered to be Si3N4/c-Si/Ag, where the Ag layer was pattered and conformal growth of Si and Si3N4 was considered. The absorption spectra in the thin Si layer were determined and found 40 times higher at the infrared region (beyond 800nm). For qualitative analysis, the short-circuit current of the solar cell was determined computationally by AM 1.5G solar illumination and found to be 2.1 times higher in the case of nanocavity as that compared to un-patterned solar cell. The enhancement in absorption in the solar cell is attributed to the different plasmonic modes coupled in the thin c-Si layer. The incident angle-dependent study was performed to observe the effect on enhancement in wide-angle incidence. The thickness-dependent study confirms 2.1 to 1.75 times enhancement in short-circuit current in 100- to 250-nm-thick c-Si layer. Therefore, this observation suggests that this structure has good prospect in achieving high conversion efficiency while reducing the device cost.
机译：在这项工作中，通过有限差分时域（FDTD）仿真研究了C-Si太阳能电池中光捕获的圆形纳米空间的影响。太阳能电池的结构被认为是Si3N4 / c-Si / Ag，其中分析Ag层，认为Si和Si3N4的共形生长。确定薄Si层中的吸收光谱，并在红外区域（超过800nm）较高的40倍。对于定性分析，通过AM 1.5G的太阳能照射计算太阳能电池的短路电流，发现与未图案化太阳能电池相比，在纳米空间的情况下发现较高的2.1倍。太阳能电池中吸收的增强归因于薄C-Si层中耦合的不同等离子体模式。进行事件依赖性研究，观察广角发生率提高的影响。厚度依赖性的研究在100至250nm厚的C-Si层中确认在短路电流中增强2.1至1.75倍。因此，该观察表明，这种结构在降低设备成本的同时实现了高转换效率的良好前景。

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