Investigation of Process Parameter Optimization of Laser-Fired Back Contact Silicon Solar Cells
Open Access
Author:
DeCesar, Brennan Lawrence
Graduate Program:
Engineering Science
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
April 02, 2010
Committee Members:
Dr Ted Reutzel, Dr S Ashok, Thesis Advisor/Co-Advisor Edward William Reutzel, Thesis Advisor/Co-Advisor S Ashok, Thesis Advisor/Co-Advisor
Keywords:
Laser-Fired Contacts LFC LFCs Solar Cells Silicon Solar Cells Silicon Photovoltaics
Abstract:
The integration of novel laser processing techniques in solar cell production promises enhancements in both cell performance and manufacturability. The viability of laser processing and its potential for improvement have been shown in recent research. This thesis focuses on original experiments utilizing a single mode fiber laser, a Q-switched second harmonic Nd:YAG laser, and a Q-switched third harmonic laser, and it includes information obtained from previous studies using an excimer laser. The effects of variations in laser conditions and parameters—such as wavelength, power, energy, pulse duration, pulse frequency, temporal pulse shape, and focus—are studied based on the electrical and mechanical effects that they induce on the sample wafers.
Well-understood laser-materials interactions are considered in regard to the laser-fired contacts themselves and to their effects on the wafer materials. Sample wafers include base float-zone silicon and Mono2™ silicon substrates with minor alterations in overall cell structure. This thesis is a contribution to a larger research project whose purpose is to discover the processing parameters for multiple laser systems that will optimize the balance between processing efficiency and solar cell performance.
