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The path to industrial production of highly efficient metal wrap through silicon solar cells

: Thaidigsmann, Benjamin; Linse, Michael; Wolf, Andreas; Clement, Florian; Biro, Daniel; Preu, Ralf

Postprint urn:nbn:de:0011-n-2143448 (398 KByte PDF)
MD5 Fingerprint: 97b0332a5ab785e75c546c1f81de555d
Erstellt am: 30.09.2013

Green 2 (2012), Nr.4, S.171-176
ISSN: 1869-876X
ISSN: 1869-8778
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISE ()
silicon; solar cell; metal wrap through (MWT); PERC; stencil printing; PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Industrielle und neuartige Solarzellenstrukturen

This work presents large-area metal wrap through (MWT) solar cells with passivated surfaces made from Czochralski grown silicon (Cz-Si). Besides further improvement in conversion efficiency, the paper addresses industrial applicability of the fabrication process and technology. Three different base materials are compared conventional boron-doped Cz-Si, gallium-doped Cz-Si and boron-doped magnetically cast Cz-Si (mCz-Si). Stencil printing is applied for front contact formation resulting in increased aspect ratio and finger homogeneity and thus low series resistance losses. Regarding material consumption, the presented cells allow for a reduction of silver usage by 30%. The peak efficiency for cells made from mCz-Si with an edge length of 156 mm is 20.2% (confirmed) in the an nealed state.