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A series of (n–i–p) a‐Si:H solar cells with light‐trapping by front‐side plasmonic Ag nanoparticle arrays was compared to a reference without the plasmonic arrays as well as to a benchmark with a conventional textured back‐side reflector for light‐trapping. The external quantum efficiency of the solar cells was determined experimentally by spectral response measurements. The comparison gives a comprehensive...