The 2025 European Conference on Optics for Solar Energy (ECOSE) reviews current trends and recent developments in optics and photonics for solar energy conversion. It covers various aspects such as fundamental optical concepts, light management, quantum dots and other luminescent materials, spectral-conversion materials, modelling, device design, fabrication technologies, and characterization. The covered applications range from single-junction and multi-junction solar cells, the optics of photovoltaic modules, to aesthetic considerations for solar energy installations in both urban and rural environments. This conference builds on the success of the Berlin-based Workshops on Optics for Solar Energy, organized since 2015, and is part of the Photonics Days Berlin Brandenburg. The Joint Lab on Optical Simulations for Energy Research (BerOSE), a shared laboratory by Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB), Freie Universität Berlin (FU) and Zuse Institute Berlin (ZIB), is involved in the conference committee.
