Solar Energy Materials and Solar Cells, Vol.87, No.1-4, 99-106, 2005
Minority carrier lifetime in plasma-textured silicon wafers for solar cells
In this work a comparison between plasma-induced defects by two different SF(6) texturing techniques, reactive ion etching (RIE) and high-density plasma (HDP) is presented. It is found that without any defect-removal etching (DRE), the minority carrier lifetime is the highest for the HDP technique. After DRE, the minority carrier lifetime rises as high as 750 mu s for both RIE- and HDP-textured wafers at an excess carrier density of 1 X 10(15) cm(-3). The measured lifetimes correspond to an implied one-sun open-circuit voltage of around 680 mV compared to about 640 mV before DRE for the HDP-textured wafers. FZ silicon < 100 > wafers were used in this study. We also noted that in the RIE process, the induced defect density was significantly lower for wafers etched at 300 K than those etched at 173 K. (c) 2004 Elsevier B.V. All rights reserved.