Chung H, Jung K-Y, Tee X T, Bermel P
Opt Express. 2014 May 5;22 Suppl 3:A818-32. doi: 10.1364/OE.22.00A818.
Amorphous silicon/crystalline silicon (a-Si/c-Si) micromorph tandem cells, with best confirmed efficiency of 12.3%, have yet to fully approach their theoretical performance limits. In this work, we consider a strategy for improving the light trapping and charge collection of a-Si/c-Si micromorph tandem cells using random texturing with adjustable short-range correlations and long-range periodicity. In order to consider the full-spectrum absorption of a-Si and c-Si, a novel dispersion model known as a quadratic complex rational function (QCRF) is applied to photovoltaic materials (e.g., a-Si, c-Si and silver). It has the advantage of accurately modeling experimental semiconductor dielectric values over the entire relevant solar bandwidth from 300-1000 nm in a single simulation. This wide-band dispersion model is then used to model a silicon tandem cell stack (ITO/a-Si:H/c-Si:H/silver), as two parameters are varied: maximum texturing height h and correlation parameter f. Even without any other light trapping methods, our front texturing method demonstrates 12.37% stabilized cell efficiency and 12.79 mA/cm² in a 2 μm-thick active layer.
非晶硅/晶体硅（a-Si/c-Si）微晶串联电池的最佳确认效率为12.3%，尚未完全达到其理论性能极限。在这项工作中，我们考虑了一种策略，即使用具有可调节短程相关性和长程周期性的随机纹理来改善a-Si/c-Si微晶串联电池的光捕获和电荷收集。为了考虑a-Si和c-Si的全光谱吸收，一种称为二次复有理函数（QCRF）的新型色散模型被应用于光伏材料（例如a-Si、c-Si和银）。它具有在单次模拟中对300-1000nm整个相关太阳带宽内的实验半导体介电值进行精确建模的优点。然后，这个宽带色散模型被用于对硅串联电池堆栈（ITO/a-Si:H/c-Si:H/银）进行建模，其中两个参数发生变化：最大纹理高度h和相关参数f。即使没有任何其他光捕获方法，我们的前表面纹理方法在2μm厚的有源层中也展示出12.37%的稳定电池效率和12.79mA/cm²的电流密度。
