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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/21599

Title: Oxygen-Induced Degradation in C-60-Based Organic Solar Cells: Relation Between Film Properties and Device Performance
Authors: Bastos, Joao P.
Voroshazi, Eszter
Fron, Eduard
Brammertz, Guy
Vangerven, Tim
Van der Auweraer, Mark
Poortmans, Jef
Cheyns, David
Issue Date: 2016
Citation: ACS APPLIED MATERIALS & INTERFACES, 8 (15), p. 9798-9805
Abstract: Fullerene-based molecules are the archetypical electron accepting materials for organic photovoltaic devices. A detailed knowledge of the degradation mechanisms that occur in C-60 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 C-60 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 C-60. Moreover, oxygen causes a 4-fold decrease of the exciton lifetime in C-60 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.
Notes: [Bastos, Joao P.; Voroshazi, Eszter; Brammertz, Guy; Poortmans, Jef; Cheyns, David] IMEC, Kapeldreef 75, B-3001 Leuven, Belgium. [Bastos, Joao P.; Poortmans, Jef] Katholieke Univ Leuven, ESAT, Kasteelpk Arenberg 10, B-3001 Leuven, Belgium. [Fron, Eduard; Van der Auweraer, Mark] Katholieke Univ Leuven, Dept Chem, Celestijnenlaan 200G-F, B-3001 Heverlee, Belgium. [Vangerven, Tim] Hasselt Univ, Inst Mat Res, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. [Vangerven, Tim] Hasselt Univ, IMEC Associated Lab IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/21599
DOI: 10.1021/acsami.5b11749
ISI #: 000374812000030
ISSN: 1944-8244
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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