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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 | Publisher: | AMER CHEMICAL SOC | Source: | 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. | Keywords: | fullerenes; oxygen; organic solar cells; stability; degradation;fullerenes; oxygen; organic solar cells; stability; degradation | Document URI: | http://hdl.handle.net/1942/21599 | ISSN: | 1944-8244 | e-ISSN: | 1944-8252 | DOI: | 10.1021/acsami.5b11749 | ISI #: | 000374812000030 | Rights: | © 2016 American Chemical Society | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2017 |
Appears in Collections: | Research publications |
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acsami%2E5b11749.pdf Restricted Access | Published version | 1.22 MB | Adobe PDF | View/Open Request a copy |
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