ИСТИНА

The paper looks at recent research dealing with organic solar cells prototypes and optimization of their characteristics. In the last decades, the search for new sources of clean renewable energy has been one of the main challenges for achieving sustainable development of humanity. This is provided by Goal 7: Ensure access to affordable, reliable, sustainable and modern energy for all, which the UN has on agenda. Therefore, the issue of technological implementation and improvement of renewable energy production methods is becoming more acute. A promising polymer with high optoelectronic properties was synthesized in the laboratory of functional materials for electronics and medicine in the Institute of problems of Chemical Physics of the Russian Academy of Sciences in Chernogolovka. Initially, it showed a power conversion efficiency of 3%, although according to literary analogues, it should have demonstrated 5-6%. So, it was decided to optimize the conditions for the production of the prototype, with the expectation of increasing efficiency. It was started with improving the ratio of donor and acceptor components and selecting the thickness of the active layer. This directly affects the absorption spectrum and mobility of charge carriers, increasing which can achieve a significant increase in the photocurrent. In this investigation, the short-circuit current increased from 7.7 to 13.4 mA/cm2. Further, the additive to the solvent and the optimal temperature of its evaporation were selected. This affected the ordering of the phases, the formation of the necessary transport channels, and reduced the recombination of charge carriers. At the end of the experiment, the method of converting the upper part of the active layer was used: solvent vapors annealing and coating of a buffer layer. This improves contact with the electrode and flattens the surface. All this is reflected in the growth of the fill factor from 51% to 62%. As a result of the optimization, we managed to achieve an increase in efficiency to 6.3%. This is a very good indicator among organic batteries based on the polymer-fullerene composite. In conclusion, it should be emphasized that increasing the power conversion efficiency by these methods in organic solar cells can contribute to their faster commercialization, early entry into the market. This will lead to less pollutants, including greenhouse gases, due to competition with traditional sources.