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Metal Pillar Interconnection Topology for Bonded Two-Terminal Multijunction III–V Solar Cells

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16 Author(s)
McMahon, W.E. ; Nat. Renewable Energy Lab., Golden, CO, USA ; Lin, C.-T. ; Ward, J.S. ; Geisz, J.F.
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Metal-interconnected multijunction solar cells offer one pathway toward efficiencies in excess of 50%. However, if a three- or four-terminal configuration is used, optical losses from the interfacial grid can be considerable. Here, we examine an alternative that provides an optimal interconnection for two-terminal bonded devices. This “pillar-array” topology is optimized by minimizing the sum of all power losses, including shadow losses and numerically computed electrical losses. Numerical modeling is used to illustrate the benefit of a pillar-array interfacial metallization for some two-terminal configurations.

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Photovoltaics, IEEE Journal of  (Volume:3 ,  Issue: 2 )