Abstract
Semiconducting nanohole arrays have been considered as a promising candidate for high-efficiency solar cells. In this paper, the optical absorption property of randomly rotated elliptical nanohole arrays consisting of , , and cells has been investigated. It is found that the average ultimate efficiency of the arrays increases with the increase of the size of the supercell. The array has the highest ultimate efficiency, and the efficiency of the array is less sensitive to the parameters of the random rotation angle than that of the and arrays. The comparison of absorption spectra of the three arrays shows that the number of absorption peaks of the array is the least, but the peak is the highest and narrowest, and that of the array is the most, but the peak is the lowest and broadest. The spatial Fourier spectroscopy analysis of the array shows that the arrays have the most Fourier spectrum components and the largest absorption mode density. The enhancement of optical absorption of the array is attributed to the folding of energy bands, the increase of the energy density of states caused by large supercells, and the overcoupling between incident light and Bloch resonant modes in the structure. The improved stability of the ultimate efficiency of the arrays is because the distribution of the energy density of states of the arrays with different random parameters tends to be the same, which leads to almost the same absorption efficiency of the different arrays.
© 2019 Optical Society of America
Full Article | PDF ArticleMore Like This
Yonggang Wu, Zihuan Xia, Zhaoming Liang, Jian Zhou, Hongfei Jiao, Hong Cao, and Xuefei Qin
Opt. Express 22(S5) A1292-A1302 (2014)
Zihuan Xia, Xuefei Qin, Yonggang Wu, Yongdong Pan, Jian Zhou, and Zongyi Zhang
Opt. Lett. 40(24) 5814-5817 (2015)
Xuefei Qin, Zihuan Xia, Yonggang Wu, Jian Zhou, and Zongyi Zhang
Appl. Opt. 56(8) 2307-2313 (2017)