Recycling of spin-triplet excitons enables 20.5% efficiency in organic solar cell

Researchers at City University of Hong Kong (CityUHK) have reported a breakthrough in organic PV by achieving a power conversion efficiency of 20.5% in an organic solar cell. This milestone was enabled by a novel strategy that re-associates normally non-emissive triplet excitons into extractable free charge carriers, significantly reducing energy losses that have traditionally limited the performance of organic PV cells. In these cells, triplet excitons are often regarded as loss channels because their long lifetimes and spin-forbidden transitions hinder efficient charge generation. The CityUHK ...

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