Introducing neat fullerenes to improve the thermal stability of slot-die coated organic solar cells

Abstract

For organic photovoltaics (OPVs) to be considered commercially viable, the devices should not only achieve high performances, but also have relatively long lifespans. In fact, a major source of lifespan...

Investigation of different degradation pathways for organic photovoltaics at different temperatures

“…As demonstrated previously, PPDT2FBT:PC 61 BM devices appeared to be relatively stable when thermally annealed at 85 1C for 16 days, compared to dark, room temperature ageing. 55 In order to monitor a period more relevant for thermal degradation, the thermal degradation was tested for 6 months. This length of time was hypothesised to allow for a more significant performance decrease to be observed.…”

“…Step Paper Materials Advances to occur at a higher temperature. 55 In this work, the purpose of the DMTA measurements was to observe how the thermal transitions changed after the samples experienced different temperatures and durations of annealing. It was hypothesised that, as the morphology changes, that there may be a shift in certain thermal transitions.…”

“…56 PPDT2FBT:PC 61 BM has also been demonstrated to enable slot-die coated devices at a variety of scales with minimal performance loss. 8,48,55,57 Although PPDT2FBT:PC 71 BM OPVs are able to achieve higher performances, 58 PC 71 BM is significantly more expensive compared to PC 61 BM, which adds more cost for large scale printed devices. 55 A handful of studies have been performed to investigate the stability of both slot-die and spin-coated PPDT2FBT:PC 61 BM devices.…”

“…This blend can be successfully deposited using slot-die coating. 55 When incorporating PPDT2FBT with PC 61 BM, spin-coated devices achieved a PCE of 9.1%. 56 PPDT2FBT:PC 61 BM has also been demonstrated to enable slot-die coated devices at a variety of scales with minimal performance loss.…”

“…8,48,55,57 Although PPDT2FBT:PC 71 BM OPVs are able to achieve higher performances, 58 PC 71 BM is significantly more expensive compared to PC 61 BM, which adds more cost for large scale printed devices. 55…”