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III–V multi‐junction solar cells are promising devices for photovoltaic applications under very high concentration levels of sunlight. Shadowing losses of the front side metallisation and ohmic resistance losses in the metal grid limit the practical cell size typically to around 1 cm2 at 1000 suns. The use of a full back‐contact architecture, similar to the metal‐wrap‐through (MWT) technology known...
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