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Development of screen-printed silicon solar cells with high fill factors on 100 Ω/sq emitters

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3 Author(s)
M. M. Hilali ; Univ. Center of Excellence for Photovoltaics Res. & Educ., Atlanta, GA, USA ; A. Rohatgi ; S. Asher

High-quality DuPont screen-printed Ag contacts were achieved on high sheet-resistance emitters (100 Ω/sq) by rapid alloying of PV168 Ag paste. Excellent specific contact resistance (∼1 mΩ-cm2) in conjunction with high fill factor (FF) (0.775) were obtained on 100 Ω/sq emitters by a 900°C spike firing of the PV168 paste in a belt furnace. The combination of the alloying characteristics of the PV168 Ag paste and optimized single-step rapid low-thermal budget firing resulted in a cost-effective manufacturable process for high-efficiency Si solar cells. In addition, the co-fired 100 Ω/sq cell showed a noticeable improvement of ∼0.5% in absolute efficiency over a conventional co-fired 45 Ω/sq emitter cell. Lighter doping in the 100 Ω/sq emitter cell resulted in better blue-response compared to the conventional cell, contributing to ∼1.3 mA/cm2 improvement in short-circuit current. Improved surface passivation on 100 Ω/sq emitter cell resulted in additional 0.6 mA/cm2 increase in Jsc, 15-mV higher Voc, and a 0.6% increase in absolute cell efficiency. Front grid design optimization resulted in a FF of 0.780, and a further improvement in cell efficiency to reach 17.4%.

Published in:

IEEE Transactions on Electron Devices  (Volume:51 ,  Issue: 6 )