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Updated: Apr 28, 2026

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Nanosecond intersystem crossing times in fullerene acceptors: implications for organic photovoltaic diodes
Philip C Y Chow1, Sebastian Albert-Seifried, Simon Gélinas
1Cavendish Laboratory, University of Cambridge, CB3 0HE, United Kingdom.
Abstract:
Triplet-exciton formation through intersystem crossing of photogenerated singlet excitons in fullerene acceptors can compete with charge generation in organic photovoltaic diodes. This article reports the intersystem crossing timescale (τISC ) of the most commonly used fullerene acceptors, PC60 BM and PC70 BM, in solutions and in spin-coated films. These times are on the nanosecond timescale, and are longer than the characteristic times for charge generation (τd ).
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