We suggest an energy selective and diffractive optical element as intermediate layer in thin-film tandem solar cells. By
adjusting the lattice constant of this photonic crystal, we fitted the optical properties to match a silicon tandem pair. Our
device enhances the pathway of incident light within an amorphous silicon top cell in its spectral region of low
absorption. In this spectral overlap region of the tandem-junction's quantum efficiencies, photons are being transferred
towards the amorphous cell, which leads to an increase in the short-circuit current of the limiting top cell. From our
simulations we expect a current increase of 1.44mA/cm<sup>2</sup> for an - amorphous/microcrystalline - silicon tandem cell,
corresponding to improvement of the tandem's absolute efficiency of about 1.3%.