H Schulte-Huxel; F Kiefer; S Blankemeyer; R Witteck; M Vogt; M Köntges; Rolf; Brendel; J Krügener; R Peibst
Flip-flop cell interconnection enabled by an extremely high bifaciality of screen-printed ion-implanted n-PERT Si solar cells Proceedings Article
In: WIP, (Hrsg.): Proceedings of the 32nd European Photovoltaic Solar Energy Conference, S. 407-412, Munich, Germany, 2016, ISBN: 3-936338-41-8.
@inproceedings{Schulte-Huxel2016b,
title = {Flip-flop cell interconnection enabled by an extremely high bifaciality of screen-printed ion-implanted n-PERT Si solar cells},
author = {H Schulte-Huxel and F Kiefer and S Blankemeyer and R Witteck and M Vogt and M Köntges and Rolf and Brendel and J Krügener and R Peibst},
editor = {WIP},
doi = {10.4229/EUPVSEC20162016-2CO.2.3},
isbn = {3-936338-41-8},
year = {2016},
date = {2016-09-01},
booktitle = {Proceedings of the 32nd European Photovoltaic Solar Energy Conference},
journal = {Proceedings of the 32nd European Photovoltaic Solar Energy Conference},
pages = {407-412},
address = {Munich, Germany},
abstract = {We present bifacial fully ion implanted and screen-printed n-PERT cells, fabricated either by applying a single co-anneal process to cure the implant damage or by applying two separate anneals after boron/BF2 and phosphorous implant, respectively. In the first case of boron implant and co-anneal our best cells achieve an independently measured front (rear) side efficiency of 21.0 % (20.43 %) and for the boron implant and separate anneal the efficiency is 21.5 % (21.31 %). To the best of our knowledge these values are the highest efficiencies reported so far for fully ion implanted and screen-printed bifacial n-PERT cells. We furthermore show that light treatment of boron-implanted and co-annealed n-PERT cells increases the cell efficiency by 0.6 %abs. This diminish the efficiency gap to separately annealed cells. We measure a bifacial factor of 99.4 % that is the highest value reported so far for any high-efficiency Si cell. The high bifaciality enables an adapted module interconnection scheme called here Flip-Flop, which is based on a front-to-front and rear-to-rear interconnection of cells with alternating orientation (n+ or p+ side facing up). Based on the measured IV-characteristic of a cell with a bifacial factor of 97 % (“conservative scenario”) we demonstrate that the Flip-Flop interconnection scheme has the potential for a module efficiency improvement of 0.5 %abs on aperture area (as compared to the conventional “all cells emitter up” configuration) despite the 3 % current mismatch. We experimentally demonstrate a monofacial 16-cell Flip-Flop module that achieves an aperture area efficiency of 20.5 %.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
M Rauer; K Bothe; C Comparotto; P Danzl; M Debucquoy; N Enjalbert; J Hohl-Ebinger; P Manshanden; Y Veschetti; J K C Wong
Monofacial IV measurements of bifacial silicon solar cells in an inter-laboratory comparison Proceedings Article
In: WIP, (Hrsg.): Proceedings of the 32nd European Photovoltaic Solar Energy Conference, S. 915-921, Munich, Germany, 2016, ISBN: 3-936338-41-8.
@inproceedings{Rauer2016,
title = {Monofacial IV measurements of bifacial silicon solar cells in an inter-laboratory comparison},
author = {M Rauer and K Bothe and C Comparotto and P Danzl and M Debucquoy and N Enjalbert and J Hohl-Ebinger and P Manshanden and Y Veschetti and J K C Wong},
editor = {WIP},
doi = {10.4229/EUPVSEC20162016-2BV.7.25},
isbn = {3-936338-41-8},
year = {2016},
date = {2016-09-01},
booktitle = {Proceedings of the 32nd European Photovoltaic Solar Energy Conference},
journal = {Proceedings of the 32nd European Photovoltaic Solar Energy Conference},
pages = {915-921},
address = {Munich, Germany},
abstract = {Standardizing illuminated IV measurements of bifacial solar cells and modules is a central objective for the introduction of bifacial products into the market. In this paper, the application of monofacial IV measurement conditions to bifacial solar cells is evaluated in an inter-laboratory comparison among seven research institutes in Europe. Bifacial silicon solar cells manufactured at five different sites with five different fabrication technologies were used in this investigation. We demonstrate that several characteristics of the measurement setups which are of minor importance for the measurement of monofacial solar cells can significantly affect bifacial solar cell measurements: (i) the reflectance of the measurement chuck and (ii) the electrical conductance of the chuck implying specific contacting schemes. When dividing the measurement results of this round robin into two groups according to chuck reflectance and conductance, the deviations in the IV parameters among the different partners are mostly within the uncertainty limits commonly reported for monofacial solar cell measurements. For standardization of bifacial solar cell measurements, it is therefore important to define admissible ranges for the chuck reflectance and to specify the contacting scheme in the standard.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}