LASER-ZONE GROWTH IN A RIBBON-TO-RIBBON (RTR) PROCESS SILICON SHEET GROWTH DEVELOPMENT FOR THE LARGE AREAnSILICON SHEET TASK OF THE LOW COST SOUR ARRAY PROJECT

摘要

We have achieved breakthroughs in two areas critical to the RTR process. A series of flat polycrystalline ribbons measuring 5 cm × 61 cm was grown and successfully separated from 24" long Mo substrates. Our first solar cells on gettered RTR silicon were grown from pre-etched (＞1/2 mil) CVD feedstock. The best cell had a conversion efficiency of 10.6％， with Voc = 0.565 volts,1sc = 29.8 ma/cm , and a fill factor of 63％. The low fill factor does indicate scthat still higher efficiencies can be attained on this material by improving the processing sequence.