光捕获增强薄膜硅太阳能电池前后不同光栅周期的研究

Dual-grating structure thin-film silicon solar cells with different front and back grating periodicities are

designed The geometrical parameters of both gratings are investigated. The reflection is greatly reduced by

the front grating, whereas the absorption in the long wavelength is increased because of the back grating.

The short circuit current of the combined structure is enhanced by 16.8% for a 1-μm thick c-Si layer

compared with that of the conformal grating structure. The short circuit current can be further increased

by creating a relative lateral displacement between the front and back gratings. The displacement results

in a more remarkably enhanced absorption when the thickness of the active layer is reduced, indicating its

importance in the design of ultra-thin high-efficiency solar cells.