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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 annealed state.

The Path to Industrial Production of Highly Efficient Metal Wrap Through Silicon Solar Cells