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Double Printing nPERT Cells with Narrow Contact Layers.pdf
Available online at
ScienceDirect
Energy Procedia 92 (2016) 939 – 948
6th International Conference on Silicon Photovoltaics, SiliconPV 2016
Double printing nPERT cells with narrow contact layers
Jan Lossena*, Dominik Rudolpha, Lejo J. Koduvelikulathua, Ricardo Carvalhob, Mark P. Rossettob, Oscar Borsatoc, Emiliano Bortolettoc, Marco Galiazzoc
aISC Konstanz e. V., Rudolf-Diesel-Stra?e 15, 78467 Konstanz,Germany bMegaCell srl, Via Postumia 9/B, 35010 Carmignano di Brenta (PD), Italy
cApplied Materials Italia, Via Postumia Ovest 244, 31048 Treviso, Italy
Abstract Screen printing of two different paste layers on top of each other is used for reducing the detrimental effect of the p+ contact to nPERT cells. For the contacting layer, a line width between 15 μm and 30 μm is used. In a second print step, using a wider opening, these contacting layers are augmented by a non-contacting paste layer to form a line of sufficient conductivity. Reduced shading and a smaller contact area lead to increased JSC and VOC. Still, an excessive reduction of the contact area causes an increase of contact resistivity compensating the gain. For an optimum configuration, an efficiency gain of up to 0.2%abs and a reduction of paste consumption by 10 mg are demonstrated on precursors from industrial production. ? 2016 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (?htt2p0:/1/c6reTahtieveAcoumthmoorsn.sP.ourgb/lliischeendsebs/ybyE-lnsce-vnide/r4L.0t/d).. PPeeeerrrreevvieiwewbybythtehsecisecnietinfitcifciconcfoenrefnecreenccoemcmoimttemeiottfeSeiloicfoSniPliVco2n0P1V6 u2n0d1e6r ruensdpeornsriebsipliotynsoifbPilSitEyAoGf P. SE AG. Keywords: screen printing; nPERT; contact formation; n-type; double printing
1. Introduction The nPERT cell (a passivated emitter rear totally diffused solar cell on n-type wafer) offers several advantages
compared to p-type cells of similar complexity, such as PERC cells: the lack of boron-oxygen degradation in the bulk, high t
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