23 1 high efficiency tunnel oxide junction bifacial solar cell with electroplated cu gridlines

• DOI: 10.4229/eupvsec20142014-2co.1.2
• Publication Date: 2014-01-01
• Authors: J. Fu; Z. Xu; C. Beitel; Z. Huang; B. Kong; A. Reddy; Y. Chae; W. Wang; K. Lam; C. Erben; J.-B. Heng; C. Liao; Z. Xie
• Keywords: WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY; 0103 physical sciences; 7. Clean energy; 01 natural sciences; Silicon Solar Cell Improvements

29th European Photovoltaic Solar Energy Conference and Exhibition; 492-496<br/>Triex® cell is a proprietary device structure based on Metal-Insulator-Semiconductor (MIS) concept which combines tunnel oxide junction with doped a-Si thin film emitter layers on n-type CZ silicon wafers. A single step patterning process combined with cost effective copper electrochemical plating (ECP) to form the electrodes. Greater than 23% high efficiency is achieved using Triex® solar cells, post optimizing key process areas to improve passivation, junction quality, emitter properties and shading effects. High open circuit voltage (Voc) 739mV and good fill factor (FF) 80.5% has been demonstrated on a 6inch solar cell. A champion 390W Triex® bifacial module is also validated under STC conditions. Extended cell and module reliability were studied in-depth and successfully tested to enable highly reliable Silevo products.<br/>