Rotary Screen Printed Metallization of Heterojunction Solar Cells: Toward High-Throughput Production with Very Low Silver Laydown
Within this work, first bifacial silicon heterojunction solar cells with rotary screen printed front- and rear-side metallization are demonstrated. The high-throughput metallization process is carried out using an innovative rotary printing demonstrator machine with short process cycle times down to 0.65 s cell-1. Furthermore, a very low total silver consumption of only 6-9 mg Wp-1 for the fully metallized bifacial silicon heterojunction solar cells is demonstrated. Using a newly developed screen simulation approach, the utilized fine line rotary and flatbed screens are analyzed regarding their suitability for fine line metallization and verified using in-depth analysis of the geometrical and electrical properties of printed and cured metallization. The best group of fully rotary screen printed cells obtains a mean conversion efficiency of η RSP,avg = 21.7% which is close to the flatbed screen printed reference group with η FSP,avg = 22.1%. Using a hybrid approach with a rotary screen printed grid on the rear side and flatbed screen printed grid on the front side, a mean conversion efficiency of η hyb,avg = 22.0% is obtained with a very low total silver consumption of only 9 mg Wp.
Salimi Sabet, Milad
Bundesministerium für Wirtschaft und Klimaschutz -BMWK-