Xia Zihuan, Qin Xuefei, Wu Yonggang, Pan Yongdong, Zhou Jian, Zhang Zongyi
Opt Lett. 2015 Dec 15;40(24):5814-7. doi: 10.1364/OL.40.005814.
We propose a perpendicular elliptical silicon nanohole (PE-SiNH) array for light absorption in thin film silicon solar cells. Our analysis shows that this architecture is capable of increasing the absorption of a thin film silicon solar cell by 11.3% in comparison to that of the optimal circular SiNH array. The process of breaking the mirror symmetries is responsible for the increase of the coupled modes. The PE-SiNH structures show additional near-zero spatial Fourier components compared with the circular SiNH structure, which helps to couple more incident light into slow Bloch modes. The mode interaction between adjacent elliptical nanoholes is in favor of the coupling of the incident light into channeling modes and, therefore, enhances light absorption in the short wavelength region.
我们提出了一种用于薄膜硅太阳能电池光吸收的垂直椭圆硅纳米孔（PE-SiNH）阵列。我们的分析表明，与最佳圆形SiNH阵列相比，这种结构能够使薄膜硅太阳能电池的吸收率提高11.3%。打破镜面对称性的过程是耦合模式增加的原因。与圆形SiNH结构相比，PE-SiNH结构显示出额外的近零空间傅里叶分量，这有助于将更多的入射光耦合到慢布洛赫模式中。相邻椭圆纳米孔之间的模式相互作用有利于将入射光耦合到通道模式中，因此增强了短波长区域的光吸收。
