The group is focused on the investigation of thin-film materials for photovoltaic cells by measuring the absorption edge by photothermal deflection spectroscopy (PDS), photocurrent and luminescence measurements. Especially photo current measurement has a strong tradition thanks to the FTPS (Fourier-Transform Photocurrent Spectroscopy) method developed in this group. The information obtained is the steepness of the absorbing edge (see Fig. A) and the absorption in the band gap (see Fig. B), which gives information about the semiconductor disorder and the concentration of deep traps. Currently, hybrid organic-inorganic perovskites CH3NH3PbI3, ZnO or diamond have become of interest. The group also deals with the preparation of these nanostructures and patented a solar cell with a nanostructured ZnO electrode (see Fig. C).