Publication date: 11th March 2026
Organic photovoltaics (OPVs) have emerged as a promising alternative to conventional silicon-based solar cells for sustainable energy applications due to their low cost, lightweight nature, and compatibility with flexible substrates through solution-based processing. The detrimental impact of non-geminate recombination on high-performance organic photovoltaics has been recognised and primarily attributed to bimolecular recombination. However, the recent surge in Y-series acceptor-based systems has drawn attention to deep-trap-assisted monomolecular recombination. In this talk, we will discuss first the morphological origin of deep traps in OPV thin films, identifying isolated crystalline and amorphous Y6 domains as key contributors. The findings underscore the importance of improving inter-acceptor domain connectivity for effective trap passivation. Furthermore, we will talk about the multiscale morphology of polymer donors and its impact on charge transport and emissive properties. Last, we will discuss the morphological origin of shunt pathways, which is also related to connected domains but at a much larger scale. We will report an effective way to passivate the shunt pathways, while retaining charge transport pathways.
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