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All-diffused back-contact back-junction solar cell with aluminum-alloyed emitter - experiment and simulation

: Wöhrle, N.; Kimmerle, A.; Greulich, J.; Wolf, A.


IEEE Journal of Photovoltaics 6 (2016), No.3, pp.641-648
ISSN: 2156-3381
Journal Article
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Pilotherstellung von industrienahen Solarzellen; Messtechnik und Produktionskontrolle; solar cell; n-type; back-junction; simulation; sentaurus

This work introduces a novel industrial feasible back-contact back-junction crystalline silicon solar cell technology with exclusively highly doped surfaces. The near-surface phosphorus doping is realized in one single tube furnace diffusion step, while the alloying of screen-printed aluminum forms the p(+)-doping. A first experimental verification leads to a conversion efficiency of 20.1%. Further possible improvements are proposed and verified with numerical simulation. We perform comprehensive step-by-step optimization led by insights from free energy loss analysis, resulting in a conversion efficiency potential of 22.4% under realistic assumptions for design optimization.