Publication date: 7th February 2022
Non-fullerene acceptors (NFAs) are currently a major focus of research in the development of high efficient bulk-heterojunction organic solar cells (OSCs). Despite of high performance, the charge transport mechanism in these types of solar cells remains a matter of debate. Here we investigated the performance of two widely used NFA-based organic solar cells with the combination of PM6 donors on the basis of optoelectronic studies. The presence of the energetic disorder is one of the factors in further limiting the effective charge carrier mobility, high reaction order, and bimolecular recombination and enhancing the efficiency. The efficient photocurrent collection of the NFA devices at high light levels can be attributed to its high effective mobility and ideal behavior of bimolecular recombination.
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