Abstract
In this work, to study the performance degradation process in PM6:N2200 all-polymer solar cells, including the optical absorption, morphology, photo-physical process of the active layer and current–voltage characteristics of the device were analyzed by employing multiple characterization techniques. The results showed that the morphology (phase sizes and phase separation scales) of PM6:N2200 would change with time. Unstable morphology of active layer determined the changeable photoelectric conversion process in operating solar cells. Besides, we found that morphological change of PM6:N2200 had a little influence on the exciton behaviors (diffusion and dissociation) within 40 days. However, it showed an undesired impact on photogenerated charge behaviors (transport and recombination). Unstable morphology of active layer and high charge recombination probability were essential reasons for the performance degradation of polymer solar cells in operating time.
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