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Among the emerging photovoltaic technologies, dye-sensitized solar cells (DSSC) show some of the required features for applications and future developments at the industrial level. The SyMMES laboratory has started to develop since 2012, new purely organic dyes for the replacement of ruthenium dyes in DSSCs. Some of these new molecules have shown high performances (above 10%) and outstanding stability (more than 5000h under continuous irradiation at 65°C) when combined to ionic-liquid based electrolytes.
In this thesis project we propose to develop a new class of organic sensitizers based on functional aromatic chromophores (patent pending).These molecules are expected to show tunable absorption in the visible range. The functional aromatic heterocycles will be developed in the first part of the project and incorporated in chemical structures of push-pull type organic dyes. Using this strategy we will develop sensitizers with variable absorption bands.
In order to develop more robust and efficient solar cells, ionic liquid electrolytes containing iodine-free redox systems will be developed. Our objective will be to obtain fully transparent and stable electrolytes to give rise to a new generation of robust and efficient dye-sensitized solar cells with variable optical transmission.
Using the research facilities of Hybrid-En and the equipment that is available in SyMMES the new molecules and electrolytes will be fully characterized (structural, electrochemical, optical properties), and they will be incorporated and tested in devices. Their photovoltaic performances and their stability will be evaluated.