In OPV devices, bisPCBM can give increased efficiency compared to devices containing PCBM, because of an increase of 100 mV in VOC. Often, there is no need to change processing conditions to get this result, when changing from PCBM to bisPCBM. BisPCBM is supplied as >99.5% purity by HPLC and 1H NMR (fullerene content). It is a mixture of isomers, as has been demonstrated in various scientific publications.
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