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Keywords:

  • organic electronics;
  • solar cells;
  • photovoltaic devices;
  • fullerenes;
  • electronic processes
Thumbnail image of graphical 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, PC60BM and PC70BM, 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).