The Deutscher Akademischer Austauschdienst (DAAD, or German Academic Exchange Service) provides a number of funding opportunities for research and study (including in natural sciences) in Germany. See here for more information on opportunities. More information for other types of funding can be found on the DAAD website. The campus liaison for DAAD is Dr. Barbara Laubenthal. Please reach out to her directly and follow up with ODPS should you need more advising.