Das Projekt "Silicon Nanodots for Solar Cell Tandem (NASCENT)" wird vom Umweltbundesamt gefördert und von Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung e.V., Zentralverwaltung durchgeführt. Objective: The overall objective of the project is to develop new Nano-materials with New Production Technologies and to fabricate silicon quantum dot tandem solar cells to achieve increased efficiencies. The understanding of electrical transport and recombination mechanisms in these newly developed nano-materials will enable us to design new tandem solar cell structures - based on Si thin-film or wafer solar cells - that help to overcome the efficiency limits of these conventional concepts. In order to reach our goals, considerable R+D work has to be performed on semiconductor bulk materials, thin layers and hetero-structures for such solar cells. These topics have not yet or only in parts been investigated and are also of high scientific interest for novel photonic and charge storage devices incorporating Si nano-crystals embedded in Si alloys. The consortium of this project, also including two companies, merges the scientific and technological competences that are necessary to find answers to these questions. Another objective is the compatibility of the newly developed technologies with high-throughput processing to ensure further cost-reduction. The expected significant jump in the solar cell and processing evolution will lead to higher efficiencies for solar cells and to ongoing cost-reduction also with a long-term perspective and will help to strengthening the European leadership in PV technologies. Thus it will also have a positive impact on the acceptance of photo-voltaics by the public and by politics. Moreover, since energy efficiency is a big subject in the public discussion, photo-voltaics will be an example of one of the highest electricity production efficiencies that have been achieved of all power generators. To sum up, we believe that this project will have a direct and positive impact on the European PV industry and its status in material science and it will contribute to the very ambitious goals of the EU commission in CO2 reduction in general.