Details

Autor(en) / Beteiligte

• Turkovic, Vida
• Prete, Michela
• Bregnhøj, Mikkel
• Inasaridze, Liana
• Volyniuk, Dmytro
• Obrezkov, Filipp A
• Grazulevicius, Juozas Vidas
• Engmann, Sebastian
• Rubahn, Horst-Günter
• Troshin, Pavel A
• Ogilby, Peter R
• Madsen, Morten

Titel

Biomimetic Approach to Inhibition of Photooxidation in Organic Solar Cells Using Beta‑Carotene as an Additive

Ist Teil von

• ACS applied materials & interfaces, 2019-11, Vol.11 (44), p.41570-41579

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Recent efficiency records of organic photovoltaics (OPV) highlight stability as a limiting weakness. Incorporation of stabilizers is a desirable approach for inhibiting degradationit is inexpensive and readily up-scalable. However, to date, such additives have had limited success. We show that β-carotene (BC), an inexpensive and green, naturally occurring antioxidant, dramatically improves OPV stability. When compared to nonstabilized reference devices, the accumulated power generation of PTB7:[70]­PCBM devices in the presence of BC increases by an impressive factor of 6, due to stabilization of both the burn-in and the lifetime, and by a factor of 21 for P3HT:[60]­PCBM devices, owing to a longer lifetime. Using electron spin resonance and time-resolved near-IR emission spectroscopies, we probed radical and singlet oxygen concentrations. We demonstrate that singlet oxygen sensitized by [70]­PCBM causes the “burn-in” of PTB7:[70]­PCBM devices and that BC effectively mitigates it. Our results provide an effective solution to the problem that currently limits widespread use of OPV.