Over 2 Years of Outdoor Operational and Storage Stability of ITO‐Free, Fully Roll‐to‐Roll Fabricated Polymer Solar Cell Modules

We report on the stability of large‐area (100 cm 2 ), low‐cost, indium‐tin‐oxide (ITO)‐free modules over two years (>17 500 h) under outdoor operational conditions in Denmark and under indoor storage condition by following ISOS‐O‐3 and ISOS‐D‐2 protocols. Irrespective of the testing regimes (storage and outdoor), all modules maintain the maximum power point (MPP) above T 80 (the duration over which a solar cell retains above 80 % of its...