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Epitaxy wrap-through rear contact solar cell fabrication and results

: Mitchell, E.J.; Brinkmann, N.; Granek, F.; Reber, S.

Fulltext urn:nbn:de:0011-n-1435342 (528 KByte PDF)
MD5 Fingerprint: 29c7480c9fb95c2565d9b94d94a3a2ee
Created on: 15.8.2012

Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Conference Paper, Electronic Publication
Fraunhofer ISE ()

The Epitaxy Wrap-Through (EpiWT) cell is a rear-contacted c-Si epitaxial thin-film solar cell. It is a cross between the Epitaxial Wafer-Equivalent and Emitter Wrap-Through (EWT) solar cells. An epitaxy-throughholes process has been developed to deposit the active layers onto the low-grade silicon substrate, whereby a beneficial geometrical structure is produced. The rear-side structuring is achieved with screen-printing and other industrially feasible processes. The characteristics of the EpiWT cell, in comparison to the EWT cell, require a small rear-side emitter area fraction and the incorporation of an isolation layer. The first ever EpiWT solar cells have been fabricated and a cell efficiency of 10.3% has been achieved (with the busbars outside the 4 cm2 illuminated aperture area). The cell performance is still limited by processing difficulties, so the structure has yet to be optimised. The dominant loss mechanisms and the effect of the isolation layer are analysed.