Abstract
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-\mu m 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.
© 2013 Chinese Optics Letters
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