The benefits and drawbacks of nanostructuring in all oxide ZnO/Cu 2 O solar cells were studied. The solar cells were fabricated on fluorine doped tin oxide substrates, with solution processed deposition methods. Both planar ZnO layer and Cu 2 O were deposited by electrodeposition while ZnO nanorods were grown by chemical bath deposition technique. It is shown that short circuit current (J sc ) of the devices increases with nanostructuring of ZnO due to electrical and optical gains. Despite improving the photocurrent, nanostructuring decreases the V oc of the device due to carrier recombination. The introduction of a thin TiO 2 interfacial layer through atomic layer deposition was able to reduce the recombination.