论文标题
使用准随机光子晶体在超薄GAAS太阳能电池中有效的光捕获
Efficient light-trapping in ultrathin GaAs solar cells using quasi-random photonic crystals
论文作者
论文摘要
超薄太阳能电池可减少材料的使用，并允许使用低质量的材料，这要构成其厚度比常规材料小的厚度。但是，需要有效的光子光捕获才能有效收集入射光，以使吸收剂厚度不足。准随机光子晶体被预测具有高效的光捕获，而在角度和厚度变化下比简单的光子晶体更健壮。在这里，我们在实验中证明了基于通过聚合物混合光刻制造的准随机光子晶体的轻捕获溶液。我们通过修改自旋涂层速度来控制平均晶格参数。我们展示了一个具有260 nm的超薄GAAS细胞，具有带有子微米特征的后准随机图案，JSC = 26.4 mA/cm2，在全球太阳能光谱下的效率为22.35％。
Ultrathin solar cells reduce material usage and allow the use of lower-quality materials thanks to their one order of magnitude smaller thickness than their conventional counterparts. However, efficient photonic light-trapping is required to harvest the incident light efficiently for an otherwise insufficient absorber thickness. Quasi-random photonic crystals are predicted to have high efficient light-trapping while being more robust under angle and thickness variations than simple photonic crystals. Here we experimentally demonstrate a light-trapping solution based on quasi-random photonic crystals fabricated by polymer blend lithography. We control the average lattice parameter by modifying the spin-coating speed. We demonstrate an ultrathin GaAs cell of 260 nm with a rear quasi-random pattern with submicron features, and a Jsc =26.4 mA/cm2 and an efficiency of 22.35% under the global solar spectrum.
