Design of plasmonic back structures for efficiency enhancement of thin-film amorphous Si solar cells.
Metallic back structures with one-dimensional periodic nanoridges attached to a thin-film amorphous Si (a-Si) solar cell are numerically studied. At the interfaces between a-Si and metal materials, the excitation of surface-plasmon polaritons leads to obvious absorption enhancements in a wide near-IR range for different ridge shapes and periods. The highest enhancement factor of the cell external quantum efficiency is estimated to be 3.32. The optimized structure can achieve an increase of 17.12% in the cell efficiency.
Bai
Wenli
W
Nano-optoelectronics Laboratory, Institute of Semiconductors, Chinese Academy of Sciences,P.O. Box 912 Beijing 100083, China.
Gan
Qiaoqiang
Q
Bartoli
Filbert
F
Zhang
Jing
J
Cai
Likang
L
Huang
Yidong
Y
Song
Guofeng
G