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Progress in photovoltaics has led to the development of a variety of solar devices, that can be divided into three generations. The representative of the third generation of solar cells are photoelectrochemical devices such as dye-sensitized solar cells (DSSC). Although they have not yet been commercialized, the materials used in these photocells, especially the various sensitizers, are the subject of intense research. Additionally, advantages such as low cost and simple recycling procedure motivate the development and testing of DSSC prototypes. The photovoltaic performance of dye cells depends largely on the dye used as the sensitizer.
This work presents research on the adsorption of organic metal-free dyes such as phenylfluorone and alizarin. The conducted investigations include UV-Vis spectroscopy, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, Fourier-transform infrared spectroscopy and scanning electron microscopy. Electrochemical impedance spectroscopy was also used to analyze internal resistance in the prepared photocells. The photovoltaic parameters were determined for different times of dye adsorption process and different dye solution concentrations. The improvement of photovoltaic performance was achieved by introducing the additional reflective coverage of the counter electrode.
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