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Development of Industrial n-Type Bifacial TOPCon Solar Cells and Modules
W. Wu, J. Bao, L. Ma, C. Chen, R. Liu, Z. Qiao, J. Chen, Z. Liu
LPCVD, Bifacial Solar Cells, Poly Si, Ion Implantation, Passivated Contact
Silicon Materials and Cells
Subtopic: Manufacturing & Production of Si Cells
Event: 36th European Photovoltaic Solar Energy Conference and Exhibition
Session: 2BP.1.5
100 - 102
ISBN: 3-936338-60-4
Paper DOI: 10.4229/EUPVSEC20192019-2BP.1.5
0,00 EUR
Document(s): paper


Jolywood n-type bifacial silicon solar cells using the cost-effective process with phosphorus-ionimplantation and low-pressure chemical vapor deposition (LPCVD) with in-situ oxidation is presented here, which increases the efficiency by 1.02% compared with the bifacial passivated emitter and rear totally diffused (n-PERT) solar cells in Jolywood. The application of ion implantation tunnel oxide passivating contacts (TOPCon) solar cells in mass production using screen-printing achieves an efficiency about 22.55% largely attributed by the improvement of the VOC from 660 mV to 688 mV. With the optimized fabrication processes, average efficiency up to 23.04% with an excellent VOC of 701 mV is obtained. The highest efficiency of 23.15% is achieved with JSC of 40.53 mA/cm2, VOC of 703 mV and FF of 81.25%. Based on the power loss analysis, the performance is mainly limited by the emitter recombination and series resistance, the efficiency of industrial TOPCon solar cell could be improved over 25.4%. The n-type bifacial TOPCon modules of 331 W (60 cells) and 392 W (72 cells) in production line have the average bifaciality of 85% and low temperature coefficient of -0.32%/K.