Abstract
A new cell design using CuInS2 (CIS) as an extremely thin absorber (ETA-solar cell) is explored. The new cell allows the collection of photogenerated charge carriers over short transport distances. The charge separation is field-assisted and hence the diffusion length is of less importance for ETA-cells. It is shown in this paper that the properties of the (CIS)layer strongly depend on the porosity of the substrate. From transmission and reflection measurements we find that scattering of light within the porous structure results in high light absorption. Photoluminescence spectra indicate, that states in the band gap of CIS depend on the porosity of the structure. The short circuit current density of the complete ETA solar cell shows a maximum with increasing thickness of the absorbing layer.
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