Oxygen-Induced Degradation in C60-Based Organic Solar Cells: Relation Between Film Properties and Device Performance.

Autor: Bastos JP; imec , Kapeldreef 75, B-3001, Leuven, Belgium.; ESAT, Katholieke Universiteit Leuven , Kasteelpark Arenberg 10, B-3001, Leuven, Belgium., Voroshazi E; imec , Kapeldreef 75, B-3001, Leuven, Belgium., Fron E; Department of Chemistry, Katholieke Universiteit Leuven , Celestijnenlaan 200G-F, B-3001 Heverlee, Belgium., Brammertz G; imec , Kapeldreef 75, B-3001, Leuven, Belgium., Vangerven T; Hasselt University, Institute for Materials Research & IMEC-Associated Lab IMOMEC , Wetenschapspark 1, B-3590 Diepenbeek, Belgium., Van der Auweraer M; Department of Chemistry, Katholieke Universiteit Leuven , Celestijnenlaan 200G-F, B-3001 Heverlee, Belgium., Poortmans J; imec , Kapeldreef 75, B-3001, Leuven, Belgium.; ESAT, Katholieke Universiteit Leuven , Kasteelpark Arenberg 10, B-3001, Leuven, Belgium., Cheyns D; imec , Kapeldreef 75, B-3001, Leuven, Belgium.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2016 Apr 20; Vol. 8 (15), pp. 9798-805. Date of Electronic Publication: 2016 Apr 11.
DOI: 10.1021/acsami.5b11749
Abstrakt: Fullerene-based molecules are the archetypical electron-accepting materials for organic photovoltaic devices. A detailed knowledge of the degradation mechanisms that occur in C60 layers will aid in the development of more stable organic solar cells. Here, the impact of storage in air on the optical and electrical properties of C60 is studied in thin films and in devices. Atmospheric exposure induces oxygen-trap states that are 0.19 eV below the LUMO of the fullerene C60. Moreover, oxygen causes a 4-fold decrease of the exciton lifetime in C60 layers, resulting in a 40% drop of short-circuit current from optimized planar heterojunction solar cells. The presence of oxygen-trap states increases the saturation current of the device, resulting in a 20% loss of open-circuit voltage. Design guidelines are outlined to improve air stability for fullerene-containing devices.
Databáze: MEDLINE
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