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Influence of rear-side passivation on solar cell performance of bosco solar cells

: Krauß, K.; Fertig, F.; Greulich, J.; Clement, F.; Biro, D.; Preu, R.; Rein, S.

Volltext ()

Bokhoven, T.P. ; European Commission:
29th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2014 : Proceedings of the international conference held in Amsterdam, The Netherlands, 22 - 26 September 2014, DVD
München: WIP, 2014
ISBN: 3-936338-34-5
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <29, 2014, Amsterdam>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Messtechnik und Produktionskontrolle; BOSCO; bifacial; double-sided collection; silicon

The recently introduced BOSCO (“Both Sides Collecting and Contacted”) solar cell exhibits emitter regions on front and rear side, which are interconnected by diffused vias. This allows double-sided collection of carriers in the base and bifacial operation while supporting standard module interconnection technology. Since the BOSCO cell’s rear side exhibits p-doped as well as highly n+-doped surfaces the dielectric used as rear-side passivation needs to be suitable to passivate both polarities. This work compares the passivation of the BOSCO cell’s rear side by a PECVD aluminium oxide (AlOx) and a thermally grown silicon oxide (SiO2). A difference in efficiency of up to = 0.5 %abs occurs between BOSCO cells with AlOx and SiO2 passivation, with the AlOx passivated solar cells achieving better cell performance. The difference in efficiency is dominated by a loss in fill factor of up to FF = 1.6 %abs for cells with SiO2 passivation compared to AlOx passivated cells. An investigation of the suns-Voc characteristics shows that this loss is mainly caused by increased recombination at lower injection, which strongly affects the pseudo fill factor. This work shows that the choice of rear-side passivation is essential to optimize the performance of BOSCO solar cells.