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Co-diffused bi-facial PERT solar cells

: Fellmeth, T.; Meier, S.; Clement, F.; Wolf, A.; Knauss, H.; Havercamp, H.

Volltext ()

Energy Procedia 124 (2017), S.875-880
ISSN: 1876-6102
International Conference on Crystalline Silicon Photovoltaics (SiliconPV) <7, 2017, Freiburg>
Konferenzbeitrag, Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISE ()

The authors present a fully solderable, co-diffused and bi-facial PERT solar cell where the rear BSG/SiN stack acting both as dopant and passivation source reaching a mean efficiency of 20.4 %. The conductivity induced by the presence of the p+ layer at the rear reduces series resistance losses significantly by simultaneously enabling the use of lowly doped Si wafers that reduce B-O degradation while maintaining a high fill factor. Parallel processed, mono-facial pendants reach the same efficiency level. A higher FF for the mono-facials is compensated by a higher Voc for the bi-facial PERT devices. SEM analysis on test structures show an overall superior, local Al-Si contact in terms of voiding and BSF thickness with reducing printed finger width. At reverse bias, the "conventional process" shows a typical behaviour for such architecture of elevated current flow around the edges. For the "adapted process" up to -12 V, the authors demonstrate a virtually shunt-free devic e exhibiting reverse currents far below 1 A with no additional process step.