Absorption Enhancement in Ultrathin Crystalline Silicon Solar Cells with Antireflection and Light-Trapping Nanocone Gratings

作者：Wang, Ken Xingze; Yu, Zongfu; Liu, Victor; Cui, Yi; Fan, Shanhui^*

来源：Nano Letters, 2012, 12(3): 1616-1619.

DOI：10.1021/nl204550q

• Solar cells
• light trapping
• antireflection
• crystalline silicon
• absorption enhancement
• nanocone gratings

Enhancing the light absorption in ultrathin-film silicon solar cells is important for improving efficiency and reducing cost. We introduce a double-sided grating design, where the front and back surfaces of the cell are separately optimized for antireflection and light trapping, respectively. The optimized structure yields a photocurrent of 34.6 mA/cm(2) at an equivalent thickness of 2 mu m, close to the Yablonovitch limit. This approach is applicable to various thicknesses and is robust against metallic loss in the back reflector.

• 出版日期2012-3