Meng Xianqin, Drouard Emmanuel, Gomard Guillaume, Peretti Romain, Fave Alain, Seassal Christian
Université de Lyon, Institut des Nanotechnologies de Lyon (INL) UMR 5270 CNRS-INSA-ECL-UCBL, France
Opt Express. 2012 Sep 10;20 Suppl 5:A560-71. doi: 10.1364/OE.20.00A560.
In this paper, we present the integration of combined front and back 1D and 2D diffraction gratings with different periods, within thin film photovoltaic solar cells based on crystalline silicon layers. The grating structures have been designed considering both the need for incident light absorption enhancement and the technological feasibility. Long wavelength absorption is increased thanks to the long period (750 nm) back grating, while the incident light reflection is reduced by using a short period (250 nm) front grating. The simulated short circuit current in a solar cell combining a front and a back grating structures with a 1.2 µm thick c-Si layer, together with the back electrode and TCO layers, is increased up to 30.3 mA/cm, compared to 18.4 mA/cm for a reference stack, as simulated using the AM1.5G solar spectrum intensity distribution from 300 nm to 1100 nm, and under normal incidence.
在本文中，我们展示了在基于晶体硅层的薄膜光伏太阳能电池中集成具有不同周期的前后一维和二维衍射光栅的情况。设计光栅结构时既考虑了增强入射光吸收的需求，也考虑了技术可行性。由于长周期（750纳米）的背光栅，长波长吸收得以增加，而通过使用短周期（250纳米）的前光栅，入射光反射得以减少。与参考叠层结构（模拟时使用300纳米至1100纳米的AM1.5G太阳光谱强度分布且垂直入射）相比，在结合了前后光栅结构以及1.2微米厚的c-Si层、背电极和透明导电氧化物（TCO）层的太阳能电池中，模拟得到的短路电流增加到了30.3毫安/平方厘米，而参考叠层结构的短路电流为18.4毫安/平方厘米。
