The development of solar cells with environmentally friendly solutions depends on efficient light absorbing material. In the proposed project we will study copper-silver based nanomaterials in the form of aerosols. With the expertise of the PPD, we will perform X-ray aerosol photoelectron spectroscopy at Synchrotron SOLEIL. PPD will teach us aerosol production and deposition techniques and analysis of the valence band structure which will enable the fabrication of advanced energy absorbers.