Systems and methods for enhanced light trapping in solar cells

摘要

Methods for improving the light trapping characteristics of crystalline silicon solar cells are provided. In one embodiment, the backside surface of a crystalline silicon solar cell substrate is textured with a pulsed laser beam. The textured backside surface of the crystalline silicon solar cell substrate is then annealed to remove damage from the laser texturization process.

主权项

1. A method for making a crystalline silicon solar cell substrate, said method comprising the steps of: providing a crystalline silicon substrate for use in an all back-contact back-junction solar cell; applying a first pulsed laser beam to the backside surface of said silicon substrate; texturing the backside surface of said silicon substrate using said first pulsed laser beam, said first pulsed laser beam having a picosecond pulse width and an infrared wavelength; applying a second pulsed laser beam to said textured backside surface; and annealing said backside surface of said silicon substrate using said second pulsed laser beam, said annealing process removing laser damage; further comprising the steps of: applying said first pulsed laser beam to the frontside surface of said silicon substrate; texturing said frontside surface of said silicon substrate with said first pulsed laser beam; depositing a dopant on the frontside surface of said thin silicon substrate; and doping said frontside of said silicon substrate with third pulsed laser beam, said laser doping process forming a front surface field.