Details
| Original language | English |
|---|---|
| Pages (from-to) | 743-749 |
| Number of pages | 7 |
| Journal | Energy Procedia |
| Volume | 92 |
| Publication status | Published - Aug 2016 |
| Event | 6th International Conference on Crystalline Silicon Photovoltaics, SiliconPV 2016 - Chambery, France Duration: 7 Mar 2016 → 9 Mar 2016 |
Abstract
Screen-printed passivated emitter and rear cells (PERC) require Ag pads on the rear side to enable solderable connections for module integration. These Ag pads are separated from the silicon by a dielectric layer to avoid recombination of minority charge carriers. The drawback of this configuration is an elongated transport path for the majority charge carriers generated above the pads. This results in an increase in series resistance. The strength of this effect depends on charge carrier generation above the Ag pads that critically depends on shading of the cell's front side. Ag pads are usually wider than the busbars or the interconnector ribbons and thus are only partially shaded. We build PERC test structures with various rear side configurations of Ag and Al screen printing as well as with and without laser contact openings (LCO). Using experiments and finite element simulations we investigate the impact of shading the Ag pads by the busbars and other means. While fully shaded regions do not increase the lumped solar cell's series resistance, unshaded Ag pads lead to an increase of about 37%.
Keywords
- laser fiered contacts, laser welding, module interconnection, PERC solar cells
ASJC Scopus subject areas
- Energy(all)
- General Energy
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In: Energy Procedia, Vol. 92, 08.2016, p. 743-749.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Impact of Ag Pads on the Series Resistance of PERC Solar Cells
AU - Schulte-Huxel, Henning
AU - Witteck, Robert
AU - Van Laak, Paula
AU - Brendemühl, Till
AU - Hinken, David
AU - Bothe, Karsten
AU - Brendel, Rolf
N1 - Funding Information: The authors thank Ulrike Sonntag and Sarah Spätlich for cell processing as well as Bianca Lim, Martin Wolf, and Ingo Ahrens for support during cell characterization. The results were generated in the PERC2Module project funded by German Federal Ministry for Economic Affairs and Energy under Contract 0325641.
PY - 2016/8
Y1 - 2016/8
N2 - Screen-printed passivated emitter and rear cells (PERC) require Ag pads on the rear side to enable solderable connections for module integration. These Ag pads are separated from the silicon by a dielectric layer to avoid recombination of minority charge carriers. The drawback of this configuration is an elongated transport path for the majority charge carriers generated above the pads. This results in an increase in series resistance. The strength of this effect depends on charge carrier generation above the Ag pads that critically depends on shading of the cell's front side. Ag pads are usually wider than the busbars or the interconnector ribbons and thus are only partially shaded. We build PERC test structures with various rear side configurations of Ag and Al screen printing as well as with and without laser contact openings (LCO). Using experiments and finite element simulations we investigate the impact of shading the Ag pads by the busbars and other means. While fully shaded regions do not increase the lumped solar cell's series resistance, unshaded Ag pads lead to an increase of about 37%.
AB - Screen-printed passivated emitter and rear cells (PERC) require Ag pads on the rear side to enable solderable connections for module integration. These Ag pads are separated from the silicon by a dielectric layer to avoid recombination of minority charge carriers. The drawback of this configuration is an elongated transport path for the majority charge carriers generated above the pads. This results in an increase in series resistance. The strength of this effect depends on charge carrier generation above the Ag pads that critically depends on shading of the cell's front side. Ag pads are usually wider than the busbars or the interconnector ribbons and thus are only partially shaded. We build PERC test structures with various rear side configurations of Ag and Al screen printing as well as with and without laser contact openings (LCO). Using experiments and finite element simulations we investigate the impact of shading the Ag pads by the busbars and other means. While fully shaded regions do not increase the lumped solar cell's series resistance, unshaded Ag pads lead to an increase of about 37%.
KW - laser fiered contacts
KW - laser welding
KW - module interconnection
KW - PERC solar cells
UR - http://www.scopus.com/inward/record.url?scp=85014494773&partnerID=8YFLogxK
U2 - 10.1016/j.egypro.2016.07.053
DO - 10.1016/j.egypro.2016.07.053
M3 - Conference article
AN - SCOPUS:85014494773
VL - 92
SP - 743
EP - 749
JO - Energy Procedia
JF - Energy Procedia
SN - 1876-6102
T2 - 6th International Conference on Crystalline Silicon Photovoltaics, SiliconPV 2016
Y2 - 7 March 2016 through 9 March 2016
ER -