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Article Dans Une Revue Journal of Materials Research Année : 2018

New insights into polymer solar cells stability: The crucial role of PCBM oxidation

Résumé

Fullerene derivatives have been ubiquitous as an electron-accepting material in organic photovoltaic solar cells (OSCs). We consider whether and why traces of PCBM oxidation products should be seen as electronic defects impairing the performance of OSCs. Thin PCBM deposits were first illuminated under ambient air for a few minutes, thus revealing the extraordinary easiness of oxidizing PCBM. The charge transfer in polymer:PCBMox bulk heterojunctions was then studied. As a result of a few minutes of PCBM photooxidation, the electron transfer from the polymer to two types of PCBMox species was shown to occur at the expense of the transfer to pristine PCBM. Such modifications to the molecular structure of PCBM and to the charge transfer at the nanoscale were finally correlated with a dramatic loss in the device's photovoltaic performance at the macroscale. This study clearly indicates the need to integrate photooxidation-resistant electron-accepting materials into OSCs to extend their lifetime
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Dates et versions

hal-01859815 , version 1 (22-08-2018)

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Anthony Perthué, Thérèse Gorisse, Hugo Santos Silva, Christian Lombard, Didier Bégué, et al.. New insights into polymer solar cells stability: The crucial role of PCBM oxidation. Journal of Materials Research, 2018, 33 (13), pp.1868 - 1878. ⟨10.1557/jmr.2018.141⟩. ⟨hal-01859815⟩
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