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Investigation of fill factor losses on 20.2% efficient n-type mono-like silicon solar cells with laser contact opening

Investigation of fill factor losses on 20.2% efficient n-type mono-like silicon solar cells with laser contact opening

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FREY, Alexander, Josh ENGELHARDT, Gabriel MICARD, Giso HAHN, Barbara TERHEIDEN, 2016. Investigation of fill factor losses on 20.2% efficient n-type mono-like silicon solar cells with laser contact opening. In: Physica Status Solidi (RRL) - Rapid Research Letters. 10(2), pp. 143-147. ISSN 1862-6254. eISSN 1862-6270

@article{Frey2016Inves-33549, title={Investigation of fill factor losses on 20.2% efficient n-type mono-like silicon solar cells with laser contact opening}, year={2016}, doi={10.1002/pssr.201510334}, number={2}, volume={10}, issn={1862-6254}, journal={Physica Status Solidi (RRL) - Rapid Research Letters}, pages={143--147}, author={Frey, Alexander and Engelhardt, Josh and Micard, Gabriel and Hahn, Giso and Terheiden, Barbara} }

Frey, Alexander 2016 Hahn, Giso 2016-04-06T14:35:38Z Engelhardt, Josh Micard, Gabriel 2016-04-06T14:35:38Z Frey, Alexander Hahn, Giso Terheiden, Barbara Large area (243.36 cm<sup>2</sup>) back-junction passivated emitter, rear totally diffused (PERT) solar cells with laser contact opening (LCO) on n-type mono-like crystalline Si with efficiencies of 20.2% are presented. Boron emitters with high electrical quality (implied open circuit voltage iV<sub>OC</sub> up to 700 mV) are formed during a co-diffusion step using SiO<sub>x</sub>:B layers. Increasing the rear metal contact coverage, we observed a decrease in fill factor (FF) instead of the expected increase due to the decrease of the back side series resistance. We show that it can be attributed to recombination centers (RCs) in the space charge region underneath the contact spots inducing an increasing second diode contribution. The presented empirical model for the RCs implemented in Synopsys Sentaurus TCAD allows for a successful reproduction of the FF, pseudo FF and V<sub>OC</sub> behaviour with contact coverage. According to this model, the RCs induced by laser ablation and subsequently evaporation of Al have a shallow exponential distribution with a characteristic length of L<sub>T</sub> = 0.2 µm and an effective surface density of N *<sub>T0</sub> = 25 cm<sup>–1</sup>. Micard, Gabriel eng Terheiden, Barbara Investigation of fill factor losses on 20.2% efficient n-type mono-like silicon solar cells with laser contact opening Engelhardt, Josh

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