2results about How to "Increase opening pressure" patented technology

This application provides a solar cell and a method for fabricating the same. The solar cell includes: a substrate having a first surface, the first surface being located on the same side as the back surface of the solar cell, the solar cell including a first region and a second region on the back surface; a tunneling oxide layer disposed on one side of the first surface; a first doped layer disposed on one side of the first surface and located within the second region, and on the surface of the tunneling oxide layer facing away from the substrate, the first doped layer having a first doping concentration; a second doped layer disposed on the side of the first doped layer away from the first surface and located within the second region, the second doped layer having a second doping concentration lower than the first doping concentration; and a third doped layer disposed on one side of the first surface, the third doped layer having a third doping concentration higher than the first doping concentration. This application can reduce parasitic absorption of light, facilitate ion transport, and further improve cell performance.

This invention discloses a high-efficiency, high-weld-strength main grid silver paste adapted to the LECO process and its application. The silver paste comprises silver powder, glass powder, and an organic carrier; wherein the glass powder comprises a Pb-B-Te-Zn glass system. This invention introduces a novel Pb-B-Te-Zn glass system into the paste, thereby giving the glass components better fluidity and etching ability during sintering. The silver powder and silicon wafer act as a strong bond, greatly improving the weld pull value. Furthermore, the paste fuses better with the solder ribbon, exhibits strong tin melting ability, and possesses a good weld fracture surface. It has a wide sintering window, making it compatible with the LECO process where the peak temperature of the existing sintering furnace decreases, reducing the fabrication cost of solar cells. It also enhances the fusion between the front main grid paste and the front fine grid paste, effectively improving the cell's on-state voltage and open-circuit flyback (FF), further improving the cell's photoelectric conversion efficiency.