Product Code: ICA10_M1101

Beam Delivery Techniques for Laser Fired Contacts
Authors:
Zhenyan Hua, Applied Research Laboratory, Pennsylvania State University; State College PA USA
Edward Reutzel, Applied Research Laboratory, Pennsylvania State University; State College PA USA
Lian Zou, Bp Solar; Frederick MD USA
Presented at ICALEO 2010

Laser Fired Contact (LFC) is a contact through the dielectric layer between the silicon wafer and back-side conductor layer produced by a laser-based technique. Such technique holds promise to dramatically reduce the overall manufacturing cost of silicon based solar cells. In an effort to investigate and optimize LFC beam delivery system, two different beam splitting technologies, diffractive optical element (DOE) and microlens array, are being evaluated and compared. Both technologies have been processed with a Q-switched 532nm Nd:YAG laser to produce an array of LFCs. The results show both are viable options for producing numerous LFCs simultaneously. But they each have respective limitations and advantages over one another.