This invention relates to a method for forming flannel surface structure on the positive of a solar energy cell including: 1, blasting the positive of a silicon chip with SiC sand to remove some films such as SiN, TiN and SiC films on the positive of the silicon chip to expose bug Si layer, and rough surface is formed on the positive of the Si chip with the roughness greater than 0.3 mum and the back keeps smooth, 2, dipping the Si chip with rough surface at the positive into an acid erosion solution, the chip processed by acid has rough surface and the back becomes smooth, 3, cleaning. |