Screen Printable Boron Doping Paste and Its Process for n-Type PERT Solar Cells

We have developed new boron paste materials for the process of diffusing crystalline silicon solar cells. The boron paste promotes pattern-forming, long carrier lifetime, and allows good sheet resistance uniformity. The cell efficiency achieved when applying boron paste to an n-type PERT cell was practically excellent. A high efficiency was also obtained under a codiffusion process with POCl3 gas for a simplifying process. We reported on the diffusion characteristic and process details of the boron paste in this paper.