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Industrially feasible all side passivated silicon based C-MWT concentrator solar cells

: Fellmeth, T.; Drews, A.; Thaidigsmann, B.; Mack, S.; Wolf, A.; Clement, F.; Biro, D.; Preu, R.


IEEE Electron Devices Society:
37th IEEE Photovoltaic Specialists Conference, PVSC 2011 : 19-24 June 2011, Seattle, WA, USA
Piscataway: IEEE, 2011
ISBN: 978-1-4244-9966-3
ISBN: 978-1-4244-9965-6 (print)
Photovoltaic Specialists Conference (PVSC) <37, 2011, Seattle/Wash.>
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Industrielle und neuartige Solarzellenstrukturen

Starting from the conventional silicon solar cell that features a single diffused shallow emitter and screen-printed contacts on both sides, we discuss possible ways to extend one- and multiple-sun conversion efficiency. From this perspective, the metal wrap through (MWT) concept that also features a full area aluminum back surface field (BSF) is discussed. By combining the passivated emitter and rear cell (PERC) approach with the MWT concept into a MWT-PERC concept, we achieve a one-sun conversion efficiency of 20.2%. Also discussed are improvements in selected process steps. By retaining the conventional Al-BSF cell design but switching to a two step metallization approach of the front, while adding a thermal treatment after emitter formation, we achieve an independently confirmed one-sun conversion efficiency of 20.1%. Adding the PERC approach to that superior front side, a one-sun conversion efficiency of 20.5% is demonstrated, which also has been independently conf irmed. Under concentration, highly illuminated solar cells profit more from improvements of the rear side where most of the series resistance r s is generated. As a consequence, on a solar cell that features a full area Al-BSF we achieve the highest conversion efficiency of 20.4% under 15 fold concentration and 19.1% at 50 suns. By excluding the busbar area the conversion efficiency increases to 20.9% and 19.5% respectively.