SiliconPV 2021 will take place as a virtual event and cover the latest trends and results in advanced technologies, materials and concepts for crystalline Si solar cells and modules, such as research on cell architectures including tandem cells, cell processes, modules, measurement, and simulation techniques. The program will be close to the well-known form of the on-site conferences of the last years, with high-level scientific talks, poster sessions, question and answer rounds and lively discussions, a sponsor area and many opportunities for social exchange between all PV experts from science and industry. The Institute for Solar Energy Research Hamelin (ISFH) will host the event.