The main objective of the project is to develop an innovative multilayer printing technology using Ink-Jet technology for the production of flexible electronics. Through close cooperation between the research centre and an experienced industrial partner, the important barriers currently present in the manufacturing process will be overcome. Physical and chemical processes occurring at the boundaries of subsequent layers/phases in multilayer printed electronic circuits will be known. This will make it possible to propose, develop and implement technological solutions that will breakthroughly expand multi-layer printing capabilities, allowing to optimise current and create a range of new flexible electronics systems. Currently, multilayer electronic circuits are performed in multi-stage printing and vacuum evaporation of materials. This approach is complex, multi-processed and in addition does not allow for precise control of optimal layer matching. The breakthrough in this project is the development of innovative multi-layer direct printing technology. For this purpose, appropriate inks containing individual functional materials will be designed and a technological process will be created to combine multiple layers during one printing operation with simultaneous control of the structure of the interfaces. The newly developed technology and production methods will allow the production of new classes of devices, such as printed photovoltaic cells, organic light emitting diodes and sensors using printing methods. These appliances must not be printed in such a way as to give them a threshold of work efficiency with the technologies currently used. The proposed technology allows for energy-efficient combination of materials with different properties