The influence of different triangular grating shapes on the absorption performance of the thin-film silicon solar cell is discussed in this paper. A finite difference time domain method is used to make the numerical simulation. By studying the shape of the triangular grating, the designs of structure are optimized to achieve higher short circuit currents and quantum efficiencies. We find that the blaze grating structure is the ideal initial texture for thin-film solar cells. Compared with the triangular grating, the short circuit current of the blaze grating is improved by 7.09% for the entire spectrum. The short circuit current for the short wavelength is increased by 13.5% whereas the short circuit current in the red and infrared part of spectrum is increased by 86.5%.© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.