Germany based Fraunhofer Institute for Solar Energy Systems ISE has developed two tandem photovoltaic modules with record efficiencies. A III-V germanium module reached 34.2% efficiency, becoming the most efficient solar module globally. It integrates solar cells from AZUR SPACE Solar Power GmbH and nano-imprint anti-reflection structures from temicon GmbH. A III-V silicon module achieved 31.3% efficiency under the Mod30plus project. The 218 cm² module was adapted for shingle interconnection. The larger 833 cm² germanium module was realized within the Vorfahrt project using triple III-V cells optimized for the terrestrial spectrum. Conventional silicon cells are limited to 29.4%, while commercial modules average about 24%. Tandem multi-junction designs aim to surpass these limits. Project partners included III/V-Reclaim, KIT, LPKF, PROTAVIC INTERNATIONAL, SUNSET Energietechnik, GOCHERMANN SOLAR TECHNOLOGY, Audi AG, Elektra Solar, with funding from Germany’s Federal Ministry for Economic Affairs and Energy.