The aim of the project is to create and patent p-type organic semiconductors, which from the layer absorbing electromagnetic radiation (perovskite) without conductivity and charger mobility would increase additives that promote the degradation of these devices, effectively ectah and transport positive chargers towards the electrode in order to obtain efficient and stable solar cells. During the project, both small molecules and polymers will be synthesised, which, without additional additives, would surpass the best hole transport materials currently used in perovskite solar cells, used with electrical additives to improve their properties. This project will result in the development of p-type organic semiconductors, which will efficiently transport positive chargers from the perovskitic layer without ionic additives in order to obtain efficient, stable perovskitic solar cells and 3 patent applications registered at the European (EPO), USA (USPTO) and Japan (JPO) patent offices. This will remove the main barrier to accelerate the market entry of the next generation of solar cells.