Among renewable energy sources, solar cells (photovoltaics), which directly convert solar energy into electricity, have become increasingly popular in recent years. Until now, scientific research and development has been mainly focused on increasing the efficiency of solar energy conversion, improving stability and reducing the cost of solar cell production. In addition, recently solar modules are increasingly being installed in the facades of buildings, and the aesthetic impression is becoming very important, even with a certain reduction in efficiency. This can be achieved, for example, by painting the outer parts of the solar module (glass, Ethylene-vinyl acetate foil), design with hidden electrical contacts, etc. For this purpose, here we investigate the influence of the modification of Ethylene-vinyl acetate (EVA) foil with organic dyes on the basic parameters of a polycrystalline silicon solar cell. Samples of EVA foil modified with two different organic colors - red and yellow – were encapsulated solar cells measuring 2x2 cm. Using a solar simulator, the I-V characteristics and spectral response of solar cells with a modified EVA foil were measured. Quantitative analysis of the experimentally obtained results was performed by adaptation to a single-diode theoretical model. The obtained results for for solar cells with modified EVA foil were compared with a solar cell encapsulated with non-modified EVA foil. The results showed that the use of EVA foil modified with organic dyes achieved an aesthetic impression, but with 10-15% lower efficiency of solar energy conversion. This is due to the higher light absorption caused by the presence of organic dye in the EVA foil.